Civil Engineer Technical interview Questions
Interview for RE and Civil Engineer by MOT (Saudi Arabia)
Q: 01 What are the duties or responsibilities of Civil Engineer? (asked every times)
Ans:
- Actually Civil Engineer has to assist the R.E in all respects, including site supervision and office works.
- He has to check the quality of work as per contractual agreements of the contract, specification & according to Client / MOT circulars.
- To make draft regarding the site problems & forward to R E.
- To make valuable coordination b/w the contractor & consultants.
- He has to organize the duties of site staff.
- To monitor the program according to contract schedule & inform to section Resident Engineer.
- To make coordination b/w concerned department regarding the removal of obstacles.
- To maintain the daily & weekly report, regarding site activities & forward to Section Resident Engineer.
- To write site instructions note & forward to section Resident Engineer for action.
- He has to keep records of all correspondence and monthly report.
- Randomly checking of lab testing and record.
Q: 02 If contractor submit the schedule, how you will check it?
Ans: As per special specifications, we have to check,
Ans: As per special specifications, we have to check,
- Contractor's main power and machinery as available at site.
- To check the program as per actual activities.
- To correct the program and send to the contractor to revise for approval.
Q: 03 What is the CPM and Bar Chart, What is the difference b/w CPM & Bar Chart? & Advantages?
Ans: CPM or critical path method for making program for a construction. It consists of a series of line inter-connected each indicate an activity. The project is divided into a number of such activities and time duration is determined. Keeping in mind number of manpower and equipment.
Ans: CPM or critical path method for making program for a construction. It consists of a series of line inter-connected each indicate an activity. The project is divided into a number of such activities and time duration is determined. Keeping in mind number of manpower and equipment.
Bar chart is a graphical representative of activities drawn horizontally representing the sequence, order & time duration. It may not necessarily be based upon list & average production of equipment whereas the CPM is basically based upon average production of equipment and availability of manpower..
Q: 04 What is preparation period, what contractor has to do OR What you will check during the mobilization period? (three times repeated)
Ans: This is the three months duration period from the date of contract signature.
To carry out all survey works,
A- Defining the road center line and fixing of leveling marks.
B- Drawing of terrain x-sections.
C- Determining the sizes of the cutting & filling sections along the road.
D- Determining the actual locations of the concrete structures.
E- Specifying all obstructions & structures impending execution.
F- The contractor has to prepare the necessary structural design & submit same for approval by the ministry & Engineer.
2- Preparation of detailed work program for all work items which should be accomplished vide the primary activities schedule.
3- Preparation of workshop location & provision of equipment.
4- Preparation of the Engineers office & supervising staff complex according to specification during the six months period.
5- Specifying water resources, material resources & excavation places & obtain necessary written approval in this regard & the written approval of owners.
6- To carry out all necessary laboratory tests for approval.
7- Specifying the location of crushers & tests of materials to be crushed for concrete or asphalt pavement works.
8- Start of preparation of the concrete & bituminous mixture according to the related specifications, circulars & the special specifications.
9- Preparation of the drawings pertaining to traffic diversions & obtaining of necessary approval for same from the bodies concerned.
10- Preparation of qualifications of all the technical staff & proposed sub contractors for approval by the bodies concerned.
11- Preparation of the monthly IPCS & the monthly laboratory tests & get approval for same & all other reports, which will be used during contract period.
Ans: This is the three months duration period from the date of contract signature.
To carry out all survey works,
A- Defining the road center line and fixing of leveling marks.
B- Drawing of terrain x-sections.
C- Determining the sizes of the cutting & filling sections along the road.
D- Determining the actual locations of the concrete structures.
E- Specifying all obstructions & structures impending execution.
F- The contractor has to prepare the necessary structural design & submit same for approval by the ministry & Engineer.
2- Preparation of detailed work program for all work items which should be accomplished vide the primary activities schedule.
3- Preparation of workshop location & provision of equipment.
4- Preparation of the Engineers office & supervising staff complex according to specification during the six months period.
5- Specifying water resources, material resources & excavation places & obtain necessary written approval in this regard & the written approval of owners.
6- To carry out all necessary laboratory tests for approval.
7- Specifying the location of crushers & tests of materials to be crushed for concrete or asphalt pavement works.
8- Start of preparation of the concrete & bituminous mixture according to the related specifications, circulars & the special specifications.
9- Preparation of the drawings pertaining to traffic diversions & obtaining of necessary approval for same from the bodies concerned.
10- Preparation of qualifications of all the technical staff & proposed sub contractors for approval by the bodies concerned.
11- Preparation of the monthly IPCS & the monthly laboratory tests & get approval for same & all other reports, which will be used during contract period.
Q: 05 How do you calculate the x-sectional area of a road section, by which method?
Ans: The average end area method shall be used in computing quantities, except where the error exceeds in plus or minus five (5%) %age as compared with the prismoidal formula, in which case the Engineer will direct the use of more accurate method.
Ans: The average end area method shall be used in computing quantities, except where the error exceeds in plus or minus five (5%) %age as compared with the prismoidal formula, in which case the Engineer will direct the use of more accurate method.
Q: 06 Suppose that a part of the details of work is missing from the drawings, and Specifications is also silent about such details, how would you instruct the contractor to do?
Ans: If the part of the details or description concerting any point of work is missing, shall be regarded as meaning that only the best generally accepted practice is be used or follow the MOT / Client circulars.
Ans: If the part of the details or description concerting any point of work is missing, shall be regarded as meaning that only the best generally accepted practice is be used or follow the MOT / Client circulars.
Q: 07 Is there any provision to pay the contractor for the materials, that he procures and stores at the job site, what is the procedure, can you explain?
Ans: The temporary payments can be made, and within the limits of (75%) of the specified cost of certain materials supplied by the contractor for use in the permanent work, provided that materials are in accordance with the specifications and have been tentatively approved by the Engineer and where applicable upon receipt of the certificate of guarantee stating that the material meets all requirements of the specifications.
Temporary payments may only be made for the following materials which are actually imported to the site according to (75%) of the market price or (75%) of the contracts unit price as appropriate.
- Cement
- Reinforcing steel, Prestressing steel.
- Road paint, bearing devices, expansion joints and electrical materials.
- Structural steel and Miscellaneous metals including guard rails, delineation and signs and Gabions baskets.
Ans: The temporary payments can be made, and within the limits of (75%) of the specified cost of certain materials supplied by the contractor for use in the permanent work, provided that materials are in accordance with the specifications and have been tentatively approved by the Engineer and where applicable upon receipt of the certificate of guarantee stating that the material meets all requirements of the specifications.
Temporary payments may only be made for the following materials which are actually imported to the site according to (75%) of the market price or (75%) of the contracts unit price as appropriate.
- Cement
- Reinforcing steel, Prestressing steel.
- Road paint, bearing devices, expansion joints and electrical materials.
- Structural steel and Miscellaneous metals including guard rails, delineation and signs and Gabions baskets.
Q: 08 If Asphalt mix temperature at site is 130˚C, will you allow the contractor to pave, if he gives you written assurance and taking responsibility?
Ans: All courses of bituminous concrete pavements shall be spread and the initial coverage or break down and compaction shall be performed, when the temperature of the mixture is not less than 140˚C and all rolling shall be completed before the temperature of the mixture drop below 90˚C. So according to specification we will not allow the contractor to carry out work at low temperature. i.e. 130˚C.
Ans: All courses of bituminous concrete pavements shall be spread and the initial coverage or break down and compaction shall be performed, when the temperature of the mixture is not less than 140˚C and all rolling shall be completed before the temperature of the mixture drop below 90˚C. So according to specification we will not allow the contractor to carry out work at low temperature. i.e. 130˚C.
Q: 09 Suppose some work items are available in the drawings, but BOQ is silent about such items, how you will pay to the contractor?
Ans: If the item of work is missing in the BOQ and available in the drawings, then we will check in the specification for the payments, if there is no payment for the item then it will be considered as subsidiary item, for example lean concrete or blinding and tack coat.
The items for which payments are mentioned in the specification but missing in the BOQ then we will prepare the rate analysis for such items of work and sent it to competent authority for approval.
Ans: If the item of work is missing in the BOQ and available in the drawings, then we will check in the specification for the payments, if there is no payment for the item then it will be considered as subsidiary item, for example lean concrete or blinding and tack coat.
The items for which payments are mentioned in the specification but missing in the BOQ then we will prepare the rate analysis for such items of work and sent it to competent authority for approval.
Q: 10 How will you prepare the monthly certificate? What are the data and quantities, you will check by your self and what will you leave for your surveyor and quantity surveyor? (three times repeated)
Ans: IPC contains the following items or parts.
1- IPC Summary and Bill No. 1 to Bill No. 9.
Bill No. 1 is for General
Bill No. 2 is for Earthworks.
Bill No. 3 is for Aggregate, Sub Base and Base Course.
Bill No. 4 is for Bituminous Construction.
Bill No. 5 is for Concrete, Steel and Structures.
Bill No. 6 is for Incidental Construction.
Bill No. 7 is for Roadway, Lighting and Traffic Signals.
Bill No. 8 is for Landscaping and Irrigation.
Bill No. 9 is for Traffic control devices and work zones.
2- Enclosure.
3- Follow up
4- Monthly report.
Surveyor will check the site and he will collect the data from site and give to the quantity surveyor, quantity surveyor will check and prepare the quantities and made correction in the IPC.
Resident Engineer / Civil Engineer has to check the overall IPC. He will check with Q.S and Surveyor, the quantities at random and the %age of work as per actual and as per schedule / work program, the equipment and staff of contractor as available at site, which the contractor mentioned in the IPC.
Ans: IPC contains the following items or parts.
1- IPC Summary and Bill No. 1 to Bill No. 9.
Bill No. 1 is for General
Bill No. 2 is for Earthworks.
Bill No. 3 is for Aggregate, Sub Base and Base Course.
Bill No. 4 is for Bituminous Construction.
Bill No. 5 is for Concrete, Steel and Structures.
Bill No. 6 is for Incidental Construction.
Bill No. 7 is for Roadway, Lighting and Traffic Signals.
Bill No. 8 is for Landscaping and Irrigation.
Bill No. 9 is for Traffic control devices and work zones.
2- Enclosure.
3- Follow up
4- Monthly report.
Surveyor will check the site and he will collect the data from site and give to the quantity surveyor, quantity surveyor will check and prepare the quantities and made correction in the IPC.
Resident Engineer / Civil Engineer has to check the overall IPC. He will check with Q.S and Surveyor, the quantities at random and the %age of work as per actual and as per schedule / work program, the equipment and staff of contractor as available at site, which the contractor mentioned in the IPC.
Q: 11 What is scope of work required under the item "un-classified excavation" mentioned in general specifications?
Ans: In un-classified excavation cut is separate and embankment fill is separate item will be paid, classified excavation is the excavation material will be reuse for the formation of embankment.
Ans: In un-classified excavation cut is separate and embankment fill is separate item will be paid, classified excavation is the excavation material will be reuse for the formation of embankment.
Q: 12 If contractor procure or bring material from crusher plant or quarries and stock store at site and he claims for payment of these materials while you are preparing monthly IPC, will you pay him against stored material, if yes then how, explain and tell the %age.
Ans: See question no 07.
Ans: See question no 07.
Q: 13 If sand storm or rain is coming & contractor wants to do the asphalt, will you allow him if his 15 dump trucks with asphalt mix are standing at site, how you will find the solution?
Ans: Bituminous material for prime coat, tack coat & fog seal shall not be applied to any surface until the air and surface temperatures are at least 15˚C and rising or shall not be executed during rain, dust or sand storms.
Ans: Bituminous material for prime coat, tack coat & fog seal shall not be applied to any surface until the air and surface temperatures are at least 15˚C and rising or shall not be executed during rain, dust or sand storms.
Q: 14 What is sand equivalent? If after improvement & adjustment in ABC material the Sand Equivalent remains low or fail then what solution you will suggest? And what is the maximum value of Hydrometer?
Ans: This test is a rapid field test to indicate the presence or absence of deterimental fine dust or clay-like material in soils or aggregate.
We can improve Sand Equivalent by adding more crusher sand passing from Sieve no 4. if above adjustment can not be make the improvement than hydrometer test will be applied, if difference is less than 5%, it will be accept, more than 5%, than the material will be rejected.
Reading of hydrometer min 0.995 and max 1.030
Length of hydrometer is 350 mm
Calibration g / ml at 20 ºC
Ans: This test is a rapid field test to indicate the presence or absence of deterimental fine dust or clay-like material in soils or aggregate.
We can improve Sand Equivalent by adding more crusher sand passing from Sieve no 4. if above adjustment can not be make the improvement than hydrometer test will be applied, if difference is less than 5%, it will be accept, more than 5%, than the material will be rejected.
Reading of hydrometer min 0.995 and max 1.030
Length of hydrometer is 350 mm
Calibration g / ml at 20 ºC
Q: 15 What is the effect of Leaching by water on concrete?
Ans: In the process of cement, hydration and soluble calcium hydroxide is formed. The leakage of water through cracks or joints or pours concrete may carry the calcium hydroxide in solution through the concrete structure. The reaction b/w the calcium hydroxide and carbon dioxide will cause precipitation of calcium carbonate in the surface will form of a white deposits, that over along period of time it will cause disintegration.
Ans: In the process of cement, hydration and soluble calcium hydroxide is formed. The leakage of water through cracks or joints or pours concrete may carry the calcium hydroxide in solution through the concrete structure. The reaction b/w the calcium hydroxide and carbon dioxide will cause precipitation of calcium carbonate in the surface will form of a white deposits, that over along period of time it will cause disintegration.
Q: 16 What are the required tests for fresh concrete?
Ans: 1)- Yield test. 2)- Air content. 3)- Cement content. 4)- Slum test and 5)- Temperature.
Ans: 1)- Yield test. 2)- Air content. 3)- Cement content. 4)- Slum test and 5)- Temperature.
Q: 17 Why the concrete cylinders are crushed after 7 days, not for other days?
Ans: Cylinders are crushed after 7 days, to determine the strength gain or development of concrete, results should not be less than 75% of the specified strength at 28 days. Then it is tested after 28 days because this is the estimated 100% strength development of the concrete.
Ans: Cylinders are crushed after 7 days, to determine the strength gain or development of concrete, results should not be less than 75% of the specified strength at 28 days. Then it is tested after 28 days because this is the estimated 100% strength development of the concrete.
Q: 18 How you will check Riding Quality of road?
Ans: By International Roughness Index (IRI) machine in meters per kilometer with selectable length, Operating speed is 0.4 m/s typical. There will be no jump when car speed is high, by straight edge, we can obtain riding quality by good leveling and smooth compaction of asphalt by steel roller and continuous operation of asphalt paving.
Ans: By International Roughness Index (IRI) machine in meters per kilometer with selectable length, Operating speed is 0.4 m/s typical. There will be no jump when car speed is high, by straight edge, we can obtain riding quality by good leveling and smooth compaction of asphalt by steel roller and continuous operation of asphalt paving.
Q: 19 Who will receive the requests from the contractor?
Ans: Civil Engineer has to receive the requests from contractor's representative.
Ans: Civil Engineer has to receive the requests from contractor's representative.
Q: 20 How will you control the works of the contractor if it is in progress?
Ans: According to the following things. 1- Drawings 2- Special specifications 3- BOQ and 4- General specifications.
Ans: According to the following things. 1- Drawings 2- Special specifications 3- BOQ and 4- General specifications.
Q: 21 How you & your site inspector will know, that there will be work tomorrow?
Ans: The contractor has to submit request 24 hours before the checking.
Ans: The contractor has to submit request 24 hours before the checking.
Q: 22 How you will construct and check settlement of foundation footing, there one is in rocks and other is in soil?
Ans: In rocks, by taking cores. And In soil by Standard Penetration Test ( SPT).
Ans: In rocks, by taking cores. And In soil by Standard Penetration Test ( SPT).
Q: 23 What is SPT?
Ans: This is the test which is carried out to know the bearing capacity of the soil. This is usually done on the foundation of bridges and huge buildings.
Ans: This is the test which is carried out to know the bearing capacity of the soil. This is usually done on the foundation of bridges and huge buildings.
Q: 24 If you are a acting RE, what is the main point you will check in the asphalt and concrete mix design, If your ME submitted to you for your correction and remarks for approval to MOC?
Ans: In concrete mix design, we have to check these things before submitting to MOT for approval.
1)- All tests should be carried out and results are satisfactory as per MOT specifications.
2)- Compressive strength should be satisfactory at 7 and 28 days.
3)- Cement factor is ≥ than minimum required by MOT.
4)- Water cement ratio is within the range.
5)- Slump of approved trial should be workable and within specification range.
6)- If admixture is added then it will approve and within the range doses.
7)- Wet mix is homogeneous and not segregated.
Ans: In concrete mix design, we have to check these things before submitting to MOT for approval.
1)- All tests should be carried out and results are satisfactory as per MOT specifications.
2)- Compressive strength should be satisfactory at 7 and 28 days.
3)- Cement factor is ≥ than minimum required by MOT.
4)- Water cement ratio is within the range.
5)- Slump of approved trial should be workable and within specification range.
6)- If admixture is added then it will approve and within the range doses.
7)- Wet mix is homogeneous and not segregated.
For Asphalt Mix Design.
1)- All tests should be carried out and results are satisfactory as per MOT specifications.
2)- Stability is higher than required.
3)- Air Voids, VMA (voids in mineral), and VF (voids in filler) should be within the range.
4)- Mix is homogeneous and not segregated.
5)- Bitumen % should be within the range.
1)- All tests should be carried out and results are satisfactory as per MOT specifications.
2)- Stability is higher than required.
3)- Air Voids, VMA (voids in mineral), and VF (voids in filler) should be within the range.
4)- Mix is homogeneous and not segregated.
5)- Bitumen % should be within the range.
Q: 25 What is the purpose of curing concrete and when you will cure the concrete?
Ans: a) To maintain moist environment and to prevent escape of mixing water required for hydration processes and helps in the development of strength.
b) To prevent cracks
c) To increase strength.
Concrete will start to cure, Right after the final placement of concrete mix, when the water sheen or mixing water just begun to disappear..
Ans: a) To maintain moist environment and to prevent escape of mixing water required for hydration processes and helps in the development of strength.
b) To prevent cracks
c) To increase strength.
Concrete will start to cure, Right after the final placement of concrete mix, when the water sheen or mixing water just begun to disappear..
Q: 26 What are the types of curing, what is membrane curing and what is the rate of application?
Ans: Types of curing are the follows. a) Water curing. b) Membrane curing. c) Steam curing method. d) Cold weather curing method.
Rate of application of curing membrane
One (1) liter / 5 m², if applied by hand spray.
One (1) liter / 3 m², if mechanically applied.
Ans: Types of curing are the follows. a) Water curing. b) Membrane curing. c) Steam curing method. d) Cold weather curing method.
Rate of application of curing membrane
One (1) liter / 5 m², if applied by hand spray.
One (1) liter / 3 m², if mechanically applied.
Q: 27 How you will make report?
Ans: By surmising all the daily activities.
Ans: By surmising all the daily activities.
Q: 28 How you will check for preparation of foundation for embankment?
Ans: Before the foundation is prepared to receive the embankment. The surface upon which the embankment is to be placed shall be scarified to a minimum depth of 20 cm, brought to a uniform moisture content within the specified limits, and compacted to the density specified for the overlying embankment.
Q: 29 Which type of material is suitable for embankment?
Ans: A-5 or better than it, C B R minimum 3%.
Ans: Before the foundation is prepared to receive the embankment. The surface upon which the embankment is to be placed shall be scarified to a minimum depth of 20 cm, brought to a uniform moisture content within the specified limits, and compacted to the density specified for the overlying embankment.
Q: 29 Which type of material is suitable for embankment?
Ans: A-5 or better than it, C B R minimum 3%.
Q: 30 Which type of material is suitable for sub grade?
Ans: A-1-a, A-1-b & A-2-4.
Ans: A-1-a, A-1-b & A-2-4.
Q: 31 What is sub grade and what are the requirement of sub grade material?
Ans: It is the soil foundation, which receives the direct traffic loads from the pavement.
Requirement of sub grade materials.
1)- Sub grade material should be A-1-a, A-1-b, A-2-4 or A-2-4 having no rock fragments larger than 10 cm.
2)- C B R minimum 25%.
3)- Material should be well graded with sufficient fines to permit compaction & compacting test.
4)- Two equal layers should be 15 cm each layer.
5)- Minimum compaction 98%.
Ans: It is the soil foundation, which receives the direct traffic loads from the pavement.
Requirement of sub grade materials.
1)- Sub grade material should be A-1-a, A-1-b, A-2-4 or A-2-4 having no rock fragments larger than 10 cm.
2)- C B R minimum 25%.
3)- Material should be well graded with sufficient fines to permit compaction & compacting test.
4)- Two equal layers should be 15 cm each layer.
5)- Minimum compaction 98%.
Q: 32 What is Agg. Base course? And material? Why is layer thickness is required? What are the quality tests required?
Ans: This work shall consist of spreading, furnishing and compacting one or more layers of ABC to the lines, elevations and thickness shown on the plans and as specified in the specifications on prepared sub grade, sub base or existing road surface
Material required:
ABC material should be clean, hard, durable, sharp angle fragments free from soft, & free from deleterious material.
1- Sodium sulphate soundness
2- Abrasion
3- Sand equivalent
4- Atterberg limits
5- Flat & elongated pieces
6- CBR
7- Sieve Analyses
8- Fractured faces.
Ans: This work shall consist of spreading, furnishing and compacting one or more layers of ABC to the lines, elevations and thickness shown on the plans and as specified in the specifications on prepared sub grade, sub base or existing road surface
Material required:
ABC material should be clean, hard, durable, sharp angle fragments free from soft, & free from deleterious material.
1- Sodium sulphate soundness
2- Abrasion
3- Sand equivalent
4- Atterberg limits
5- Flat & elongated pieces
6- CBR
7- Sieve Analyses
8- Fractured faces.
Q: 33 What are the quality requirements for aggregate base course material?
Ans: 1- Sodium sulphate soundness 12 max
2- Abrasion loss 45 max
3- Sand equivalent 45 min
4- Liquid limit 25 max
5- Plasticity Index 06 max
6- Mechanically two fracture faces 90 % by weight.
7- Flat & elongated pieces 08 max
8- CBR for grade I 100 min
9- CBR for grade II 80 min
10- CBR for grade III 65 min
11- Aggregate size for grade I 2″ max
12- Aggregate size for grade II 1.5″ max
13- Aggregate size for grade III 1″ max
14- Compaction 100%
Q: 34 How you will construct ABC?
Ans: 1- The aggregate base shall be spread by spreader boxes or pavers machine
2- The layer should not be less than 7cm and nor more than 15cm of compacted thickness.
3- The ABC shall not be spread more than 2000 m² in advance of the rolling.
4- After the course has been completely compacted, the surface shall be tested for smoothness and accuracy of grade and crown.
5- The finished surface shall not vary more than 9 mm from a 5 m straight edge when applied to the surface parallel with and at right angles to the centre line.
6- Thickness shall represent not more than 300 m² by cores.
7- when the difference is more than 12 mm, the contractor shall correct such areas by scarifying, adding base mixture, rolling, reshaping and finishing.
Ans: 1- Sodium sulphate soundness 12 max
2- Abrasion loss 45 max
3- Sand equivalent 45 min
4- Liquid limit 25 max
5- Plasticity Index 06 max
6- Mechanically two fracture faces 90 % by weight.
7- Flat & elongated pieces 08 max
8- CBR for grade I 100 min
9- CBR for grade II 80 min
10- CBR for grade III 65 min
11- Aggregate size for grade I 2″ max
12- Aggregate size for grade II 1.5″ max
13- Aggregate size for grade III 1″ max
14- Compaction 100%
Q: 34 How you will construct ABC?
Ans: 1- The aggregate base shall be spread by spreader boxes or pavers machine
2- The layer should not be less than 7cm and nor more than 15cm of compacted thickness.
3- The ABC shall not be spread more than 2000 m² in advance of the rolling.
4- After the course has been completely compacted, the surface shall be tested for smoothness and accuracy of grade and crown.
5- The finished surface shall not vary more than 9 mm from a 5 m straight edge when applied to the surface parallel with and at right angles to the centre line.
6- Thickness shall represent not more than 300 m² by cores.
7- when the difference is more than 12 mm, the contractor shall correct such areas by scarifying, adding base mixture, rolling, reshaping and finishing.
Q: 35 Before pouring of concrete, what you will check for mixture?
Ans: 1- First of all surveyor has to check the levels and location of the structure.
2- Formwork, reinforcement should be checked as per bar bending schedule. 3- All equipments of the contractor should be checked for the pouring of concrete.
4- Weather condition also keeps in consideration.
5- Air temperature should be checked.
Ans: 1- First of all surveyor has to check the levels and location of the structure.
2- Formwork, reinforcement should be checked as per bar bending schedule. 3- All equipments of the contractor should be checked for the pouring of concrete.
4- Weather condition also keeps in consideration.
5- Air temperature should be checked.
Q: 36 If cement is low in concrete, but required strength is achieved, what you will do as per specification? OR If contractor make a design of concrete with less cement content than the require, and attain the required strength, will you accept it, if yes then why and if no then why? Explain?
Ans: We will reject it, because with the passage of time, durability of concrete will be affected. `
Ans: We will reject it, because with the passage of time, durability of concrete will be affected. `
Q: 37 If voids & stability is low or voids are low & stability is satisfactory, how you will adjust the mix? OR If you are acting RE and your ME inform you that the asphalt mix design shows that air voids and stability is low, how will you correct it?
Ans: 1- By decreasing asphalt content, voids can be increased. Lowering the asphalt content, increases the voids content & also reduces the film thickness. Which however decreases durability of the pavement. More reduction of film thickness also may lead to pavement brittleness, accelerated asphalt oxidation & increased.
2- Increase the coarse aggregate or reduce fine aggregate.
3- If the above adjustments do not produce a stable mix, the aggregate may have to be change. Improve the quality of aggregate, more fractured faces & well graded aggregate should be used.
Ans: 1- By decreasing asphalt content, voids can be increased. Lowering the asphalt content, increases the voids content & also reduces the film thickness. Which however decreases durability of the pavement. More reduction of film thickness also may lead to pavement brittleness, accelerated asphalt oxidation & increased.
2- Increase the coarse aggregate or reduce fine aggregate.
3- If the above adjustments do not produce a stable mix, the aggregate may have to be change. Improve the quality of aggregate, more fractured faces & well graded aggregate should be used.
Q: 38 If voids are satisfactory but stability is low, how you will adjust the mix?
Ans: If voids are satisfactory & stability is low, it means
1- Deficiencies in aggregate gradation.
2- To improve the quality of aggregates for more strength.
3- Fractured faces & well graded aggregate should be used to adjust the mix.
Ans: If voids are satisfactory & stability is low, it means
1- Deficiencies in aggregate gradation.
2- To improve the quality of aggregates for more strength.
3- Fractured faces & well graded aggregate should be used to adjust the mix.
Q: 39 If voids are high, stability is satisfactory, or voids are high & stability is low, how you will adjust the mix?
Ans: Voids will be adjusted by adding mineral dust, if the adjustment does not improve then improve the quality of aggregate.
Ans: Voids will be adjusted by adding mineral dust, if the adjustment does not improve then improve the quality of aggregate.
Q: 40 If C B R of the material is failed, how you will do for this material?
Ans: C B R can be improved by adding more coarser material or reduces by adding more fine material.
Ans: C B R can be improved by adding more coarser material or reduces by adding more fine material.
Q: 41 You are to select any one of the following for control of works, which you will select?
a) Gen. specification
b) Special specification
c) BOQ
d) Drawings.
Ans We have to select as
1)- Drawings
2)- Special specifications.
3)- Bill of quantities.
4)- General specifications.
a) Gen. specification
b) Special specification
c) BOQ
d) Drawings.
Ans We have to select as
1)- Drawings
2)- Special specifications.
3)- Bill of quantities.
4)- General specifications.
Q: 42 If there is contradiction among General specification and Special specification, which one you will select?
Ans: We have to follow the special specifications.
Ans: We have to follow the special specifications.
Q: 43 How you will construct the road, if space for construction is very small?
Ans: We can construct the road in small space, by constructing retaining walls.
Ans: We can construct the road in small space, by constructing retaining walls.
Q: 44 What is the purpose of doing liquid limit test?
Ans: Liquid limit can be determined to know shearing resistance of soil.
Ans: Liquid limit can be determined to know shearing resistance of soil.
Q: 45 If site inspector is complained against the contractor, how you will deal it?
Ans:
Ans:
Q: 46 If cracks appeared on sub-grade, how you will rectify it?
Ans: If cracks appeared on sub-grade, it means clay contents are more in material. It can be rectify by scarifying & adding more coarser material, then recompact it.
Ans: If cracks appeared on sub-grade, it means clay contents are more in material. It can be rectify by scarifying & adding more coarser material, then recompact it.
Q: 47 What is A-1-a, A-1-b & A-2-4 material, & how you will distinguish A-2-4 material dumped on site?
Ans: A-1-a, A-1-b is a mixture of stone fragments, gravel & sand. Where as A-2-4 is a mixture of silty or clayey gravel & sand. A-1-a & A-1-b material is coarser than A-2-4 material.
Ans: A-1-a, A-1-b is a mixture of stone fragments, gravel & sand. Where as A-2-4 is a mixture of silty or clayey gravel & sand. A-1-a & A-1-b material is coarser than A-2-4 material.
Q: 48 What are the tools required for checking of sub-grade, & how the surface of compacted area of sub-grade to be checked?
Ans: With straight edge we will check the smoothness of compacted area of sub grade.
Ans: With straight edge we will check the smoothness of compacted area of sub grade.
Q: 49 How you will check rock fill preparation?
Ans: Refer to MOT circulars.
Ans: Refer to MOT circulars.
Q: 50 What is soil classification?
Ans: Classify the soil in different classes or sizes.
Ans: Classify the soil in different classes or sizes.
Q: 51 What are types of tests for soil classification?
Ans: Sieve analysis, Plastic limit & Plasticity index ( Atterberg Limits)
Ans: Sieve analysis, Plastic limit & Plasticity index ( Atterberg Limits)
Q: 52 What is CBR, how much surcharge weight is needed?
Ans: It is the measure of shearing resistance of soil to the direct penetration under the controlled density and moisture. It evaluates stability of soil and other material, passing 20mm sieve, is used only.
Ans: It is the measure of shearing resistance of soil to the direct penetration under the controlled density and moisture. It evaluates stability of soil and other material, passing 20mm sieve, is used only.
It is also defined as the ratio of the test load to the standard load, expressed as %age for a given penetration of the plunger.
CBR = (test load / standard load) x 100
CBR = (test load / standard load) x 100
Q: 53 What is relative density?
Ans: It is the state of compactness of a soil with respect to the loosest state at which it can be placed.
% R.D = [{(r field – r min) x r max}/ {(r max – r min) x r field}x 100]
Ans: It is the state of compactness of a soil with respect to the loosest state at which it can be placed.
% R.D = [{(r field – r min) x r max}/ {(r max – r min) x r field}x 100]
Q: 54 How much meter away you will do rock fill from structures?
Ans: As per specification we have to do rock fill 5 meters away from structures.
Ans: As per specification we have to do rock fill 5 meters away from structures.
Q: 55 What type of cement you will use for under ground concrete?
Ans: Type V or Sulphate Resisting Cement (SRC).
Ans: Type V or Sulphate Resisting Cement (SRC).
Q: 56 Which type of material you will use for back filling of structures?
Ans: Material used for backfill should be A-1a, A-1b, A-2-4 and no rock fragments more than 8 cms. No back fill will start before the concrete strength is not less than 180 kg/cm² in compression, or until the concrete has been in place 28 days.
Ans: Material used for backfill should be A-1a, A-1b, A-2-4 and no rock fragments more than 8 cms. No back fill will start before the concrete strength is not less than 180 kg/cm² in compression, or until the concrete has been in place 28 days.
Q: 57 Why we are doing the bitumen paint on structures?
Ans; This work shall consist of providing protective coating to existing concrete structure. Protective coating shall be used to improve the durability of concrete by protecting it from degradation by chemicals and subsequent loss of structure integrity.
Ans; This work shall consist of providing protective coating to existing concrete structure. Protective coating shall be used to improve the durability of concrete by protecting it from degradation by chemicals and subsequent loss of structure integrity.
Q: 58 Will you allow the contractor to proceed work in night?
Ans: According to specification we will not allow the contractor to proceed work in night.
Ans: According to specification we will not allow the contractor to proceed work in night.
Q: 59 What is the limit of fineness modulus of sand?
Ans: 2.3 to 3.1
Ans: 2.3 to 3.1
Q: 60 Can we use sand for sub-grade? ( third times asked)
Ans: Sand can not be used for sub-grade, because
1- Poor load sustaining quality.
2- Highly permeable.
3- Compressible under sustain load.
4- Subject to change in strength & volume due to variation in water content.
Ans: Sand can not be used for sub-grade, because
1- Poor load sustaining quality.
2- Highly permeable.
3- Compressible under sustain load.
4- Subject to change in strength & volume due to variation in water content.
Q: 61 What is the asphalt temperature behind the pavers (compacting temp)?
Ans: 145 C˚ ± 5 C˚.
Ans: 145 C˚ ± 5 C˚.
Q: 63 What is the temperature required in asphalt mixing plant?
Ans: Asphalt temperature should not be more than 165˚C at plant.
Q: 64 What is the temperature required in asphalt mixing plant?
Ans: Mixing temperature of asphalt when enter in pugmil should be 145˚C – 180˚C.
Ans: Mixing temperature of asphalt when enter in pugmil should be 145˚C – 180˚C.
Q: 65 What is the maximum size of aggregates for BBC and BWC?
Ans: Maximum size of aggregate for BBC is 1.5˝ and 3/4˝for BWC.
Ans: Maximum size of aggregate for BBC is 1.5˝ and 3/4˝for BWC.
Q: 66 What is the maximum variation is allowed for asphalt content?
Ans: Maximum variation is allowed for asphalt content ± 0.4.
Ans: Maximum variation is allowed for asphalt content ± 0.4.
Q: 67 What is the Concrete temperature?
Ans: Concrete temperature should not be more than 33˚C and not less than 15˚C in cold weather. But pumping temperature of concrete in hot weather should be 26˚C.
Ans: Concrete temperature should not be more than 33˚C and not less than 15˚C in cold weather. But pumping temperature of concrete in hot weather should be 26˚C.
Q: 68 How to make dense concrete?
Ans: 1- Proper proportion of water cement ratio.
2- Aggregate should be well graded.
3- Concrete should be air entrained.
4- Good vibration.
5- Use of plasticizer.
Ans: 1- Proper proportion of water cement ratio.
2- Aggregate should be well graded.
3- Concrete should be air entrained.
4- Good vibration.
5- Use of plasticizer.
Q: 71 How much % of sand will be used in asphalt mix?
Ans: Natural sand ( % of fine aggregate) 15% maximum & Dune sand ( % of natural sand) 50% maximum.
Q: 72 What is the Raveling and its causes?
Ans: It is the progressive loosening or separation of aggregate particles in a pavement surface coarse from the surface downward or from the edge inward.
The causes are:
1- Lack of compaction
2- Construction in thin lift during cold weather
3- Dirty or disintegrated aggregates
4- Too little asphalt in the mix
5- Overheating of asphalt mix
6- Mix is very close to coarse
7- Action of water
8- Sensitive aggregate refuse coating due to special charge (anti-stripping materials must be used)
Ans: It is the progressive loosening or separation of aggregate particles in a pavement surface coarse from the surface downward or from the edge inward.
The causes are:
1- Lack of compaction
2- Construction in thin lift during cold weather
3- Dirty or disintegrated aggregates
4- Too little asphalt in the mix
5- Overheating of asphalt mix
6- Mix is very close to coarse
7- Action of water
8- Sensitive aggregate refuse coating due to special charge (anti-stripping materials must be used)
Q: 73 If there is the problem in asphalt after paving, what will be the solution?
Q: 74 Suppose one side of the bridge foundation is in rock and other is in loose soil, and settlement occurs, what will be solution?
Q: 75 Describe your previous project?
Q: 76 What was the number of lanes and total width of carriage way?
Q: 77 If drawing shows a thickness of 20 cm for sub grade and specification says 30 cm thick, which one you will adopt for execution?
Ans: We have to follow the drawings.
Ans: We have to follow the drawings.
Q: 78 What you will do, if inspector tells you that the mix is of higher slump than the value for approved mix design but the site slump is within limits specified in special specifications?
Ans: We will wait for compressive strength.
Ans: We will wait for compressive strength.
Q: 79 Before the monthly certificate is submitted to MOC, what are the steps that the RE or CE must follow in its preparation?
Ans: 1- Check the computations and other supporting documents submitted by the contractor.
2- Check the accomplishment of every items of work.
3- Check the total accomplishment (in Saudi Riyals) & the % accomplished for every PART of the contract items.
4- Compute all deductions due to penalty imposed on the contractor (such as delayed in housing & vehicles delivery, etc)
5- Prepare summary of all PARTS & deductions (if there's any) to get the total % of accomplishment.
6- Prepare & sign work certificate, (this is also sign by the main office).
7- All English version must translated in Arabic.
8- Stamp & sign every page.
Ans: 1- Check the computations and other supporting documents submitted by the contractor.
2- Check the accomplishment of every items of work.
3- Check the total accomplishment (in Saudi Riyals) & the % accomplished for every PART of the contract items.
4- Compute all deductions due to penalty imposed on the contractor (such as delayed in housing & vehicles delivery, etc)
5- Prepare summary of all PARTS & deductions (if there's any) to get the total % of accomplishment.
6- Prepare & sign work certificate, (this is also sign by the main office).
7- All English version must translated in Arabic.
8- Stamp & sign every page.
Q: 80 What are the documents included in the monthly certificates?
Ans: 1- Work completion certificate.
2- Computation for various deductions (if there's any)
3- Summary
4- Individual PARTS & its items.
5- Stockpiled materials (if ther’s any)
Note: The contractor must attach also all invoices duly stamped for the claim of this stockpiled materials.
Ans: 1- Work completion certificate.
2- Computation for various deductions (if there's any)
3- Summary
4- Individual PARTS & its items.
5- Stockpiled materials (if ther’s any)
Note: The contractor must attach also all invoices duly stamped for the claim of this stockpiled materials.
Q: 81 Who prepares the monthly report, how is it prepared & what are its contents?
Ans: The Engineer will prepare the report & is prepared in the following manners.
1- Project Status:
-Mention the period of the project.
-Project name & number
-Name of the consultant & contractor,
-Road length.
-Contract amount.
-Date of handover
-Contract time & date of expiration of contract.
-Months expired
-Extension time given to the contractor
-Amount of completed work for the month / period
-%age completed for the month
-Total amount of work completed to date
-Total %age completed to date
-%age ahead of schedule
-%age behind schedule & reasons of delay
Ans: The Engineer will prepare the report & is prepared in the following manners.
1- Project Status:
-Mention the period of the project.
-Project name & number
-Name of the consultant & contractor,
-Road length.
-Contract amount.
-Date of handover
-Contract time & date of expiration of contract.
-Months expired
-Extension time given to the contractor
-Amount of completed work for the month / period
-%age completed for the month
-Total amount of work completed to date
-Total %age completed to date
-%age ahead of schedule
-%age behind schedule & reasons of delay
2- Introduction:
a- Brief of Project
Mention classes of road (whether class A or B)
Duel carriageway
Interchange, etc.
a- Brief of Project
Mention classes of road (whether class A or B)
Duel carriageway
Interchange, etc.
b- Reasons of delay- may be due to:
Lack of equipment
Lack of technical & skilled personal
Frequent breakdown of equipment
Delay in manpower mobilization
Lack of program of work
Lack of equipment
Lack of technical & skilled personal
Frequent breakdown of equipment
Delay in manpower mobilization
Lack of program of work
c- Project problems
Innumerate the problems & action or solution taken
If pending action state where
Is there any follow-up letter
Advise maximum time if not done, what is the adverse effect
Problems involving third private parties
Innumerate the problems & action or solution taken
If pending action state where
Is there any follow-up letter
Advise maximum time if not done, what is the adverse effect
Problems involving third private parties
3- Summary of supervising staff activities:
a- Activities particularly the supervision of works of the contractor in earthworks, & other items of works, in surveying and materials quality control
a- Activities particularly the supervision of works of the contractor in earthworks, & other items of works, in surveying and materials quality control
4- List of supervising staff in site:
5- Summary of contractor’s work activities:
Same as that of the staff but here the scope or limits of works are mentioned, and in material’s quality control, the number of tests performed is reported.
Same as that of the staff but here the scope or limits of works are mentioned, and in material’s quality control, the number of tests performed is reported.
6- Completed Works:
a- Production this month and total production of items as per BOQ.
b- How is compared to the schedule
a- Production this month and total production of items as per BOQ.
b- How is compared to the schedule
7- Progress Chart:
8- Contractor’s Technical Staff (list)
a- Contractors equipment on site, with column for what equipment are working, under repair, idle. Also another column for the number required for such equipment
a- Contractors equipment on site, with column for what equipment are working, under repair, idle. Also another column for the number required for such equipment
Q: 82 If the contractor refuses to submit computations for the months certificate, What will you do?
Ans: The Engineer may either make his own computations & make certificate or he may not submit certificate for the month, however, it must be reported to the Ministry or so stated in the monthly report that no certificate is submitted because the contractor refuses to submit computations & other documents.
Ans: The Engineer may either make his own computations & make certificate or he may not submit certificate for the month, however, it must be reported to the Ministry or so stated in the monthly report that no certificate is submitted because the contractor refuses to submit computations & other documents.
Q: 83 Suppose your Material Engineer reported to you that there is a problem in the Batching Plant, What will you do?
Ans: I will ask him first what is the problem, than together we will go to the plant & investigate thoroughly. Then make necessary adjustments or corrections.
Ans: I will ask him first what is the problem, than together we will go to the plant & investigate thoroughly. Then make necessary adjustments or corrections.
Q: 84 At least how many hours you act on the contractor’s work request.
Ans: 24 hours.
Ans: 24 hours.
Q: 85 What will you do, those request for link road?
Ans: I will make a feasibility study.
Ans: I will make a feasibility study.
Q: 86 Suppose a citizen requests the relocation of the Box Culverts so that water will go to his farm, will you follow him?
Ans: If as planned the box culvert is located or to be constructed right on the water channel. No, we will not relocate.
If the water channel is located on his land, Yes, we will relocate.
Ans: If as planned the box culvert is located or to be constructed right on the water channel. No, we will not relocate.
If the water channel is located on his land, Yes, we will relocate.
Q: 87 What consist the Bituminous Base Course?
Ans: It consist of mineral aggregate such as coarse aggregates, fine aggregates, and mineral filler (if required) and asphalt.
Ans: It consist of mineral aggregate such as coarse aggregates, fine aggregates, and mineral filler (if required) and asphalt.
Q: 88 What are the requirements for the coarse aggregate that is to used in Bituminous Base Course?
Ans: a- Shall be crushed rock or crushed gravel.
b- Shall be clean, hard, tough, durable & sound.
c- Shall be of uniform quality.
d- Shall be free from excess elongated pieces (in no case not more than 10%)
e- Shall pass the stripping test.
Ans: a- Shall be crushed rock or crushed gravel.
b- Shall be clean, hard, tough, durable & sound.
c- Shall be of uniform quality.
d- Shall be free from excess elongated pieces (in no case not more than 10%)
e- Shall pass the stripping test.
Q: 89 What is the proportion of mineral aggregates and asphalt in a job mix?
Ans: Total mineral aggregates in form 96 – 93%, Asphalt binder is form 4 – 7%.
Ans: Total mineral aggregates in form 96 – 93%, Asphalt binder is form 4 – 7%.
Q: 90 Who will prepare trial mixes?
Ans: The contractor, but in the presence of the Engineer.
Ans: The contractor, but in the presence of the Engineer.
Q: 91 Which do you prefer to have more asphalt or less asphalt content of the job mix, why?
Ans: I prefer a higher asphalt content, because in the kingdom where the oxidizing and drying effect of the sun great higher asphalt content is preferable.
Ans: I prefer a higher asphalt content, because in the kingdom where the oxidizing and drying effect of the sun great higher asphalt content is preferable.
Q: 92 What will happen if your asphalt content is more than 0.40% of the design job mix?
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