Method Statement for Asphalt Paving Works

Method Statement for Asphalt Paving Works

(Civil Engineering)

Effective Date:
Document No.:
Approved By:    Eng. Muhammad Arif

PROJECT NAME: --------------------------------------------------------------------------

SAMPLE 1

TABLE OF CONTENT

1.     ACTIVITY

2.     INTRODUCTION

3.     TERMINOLOGY

4.     SIGNIFICANT HAZARDS IDENTIFIED

5.     ROLES & RESPONSIBILITY AND ORGANIZATION CHART

6.     SEQUENCE OF ACTIVITIES WITH RESPONSIBILITIES

6.1   Pre-commencement Requirements

6.2   General Requirements

6.3   Co-ordination with Other Trades

6.4    Delivery, Storage & Handling of Materials

6.5    Execution

7.     REQUIREMENTS

 7.1   Plans/Records & Job instructions (Documentations)

 7.2   Training

 7.3   PPE (Personal Protective Equipment)

 7.4   Equipment & Tools required

8.     HSE & Emergency Procedures

9.     ReferenceS

10. AttachmentS

1. ACTIVITY:  LAYING OF ASPHALT ROAD

This activity deals with the installation and sequence of Laying of Asphalt road as per approved drawings and project specifications and to ensure that the works are carried out in accordance with the HSEQ documents.

2). INTRODUCTION

The purpose of this method statement is to describe the procedure which shall be followed for Laying of Asphalt road to comply with schedule of finishes, the General, Architectural & Civil Specifications for the Project and Owner / Engineer requirements.

3). TERMINOLOGY

O/E: Owner / Engineer

PPE: Personal Protective Equipment

       QC: Quality Control

4). SIGNIFICANT HAZARDS IDENTIFIED

·     Respiratory hazard

·      Injury to person

·       Wrist Pain/Stress/fatigue

·       Slip/trip/fall hazards

·       Back injury

·       Vehicles movement

·        Sharp edges

·       Cut Injury

·       Injury to Eye/Eye Irritation

·       Chemical usage hazard

·       Machinery

·       Work related  upper limb disorders

·       Electric Shock

5). ROLES & RESPONSIBILITIES AND ORGANIZATION CHART

·       Project Manager (Main Contractor)

o   The project manager is responsible for overall implementation of this Method Statement and HSEQ related to this activity.

o   Ensure that the Site construction and his team will aware of this Method Statement 

o   Site construction and his team will report to the project manager.

·       Construction Manager (Main Contractor)

o   Make arrangement for availability of all relevant documents.

o   Ensure the availability of necessary documents & resources available with Subcontractor.

o   Liaison with Owner/Engineer & Subcontractor in-charges for necessary test & inspection.

o   Tracks the schedule & plan work accordingly.

o   Liaison with all Electrical/MEP work in-charges for all interfaces works and plans the work accordingly at site.

·       Engineer (Main Contractor)

o   Ensures the control at work spots in person.

o   Verifying the percentage compliance as per risk assessment.

o   Ensures the emergency preparedness of team and taking the part in Subcontractor’s TBT (Tool Box Talk)

o   Ensures the work carried out as per latest approved drawings.

o   Ensure availability of necessary resources and approved documents.

o   Inspects the incoming materials in line with approved documents.

o   Ensure the quality of work/material and readiness for inspection.

·       Safety Officer (Main Contractor)

o   Responsible for ensuring HSE at all stages of work.

o   Ensures the compliance of all control measures at site as per approved risk assessment plan.

o   Ensures for all checklist as per HSE plan.

·       Project Manager (Subcontractor)

o   Ensure that appropriate resources are provided for the safe delivery of the work

·       QA/QC Engineer (Subcontractor)

o   Ensuring quality of work carried out at site

o   Ensuring for inspection on hold points

o   Maintaining all QC records

o   Coordinating with O/E for inspections

·       Site In charge (Subcontractor)

o   Ensuring the relevant document

o   Plans the necessary men and material resources for  timely completion and quality

·       Site Engineer (Subcontractor)

o   Ensuring the controls at work spot in person

o   Verifying the % compliance as per risk assessment.

o   Ensuring the emergency preparedness.

o   Arranging the required inspections and permit

o   Ensures all scaffolding erected  safely and scaffolding tag system followed

o   Ensures availability of the necessary resources.

o   Ensuring availability of all activity relevant latest approved drawing and documents

·       Supervisor / Foreman (Subcontractor/Supplier)

o   Obtaining the permit (if required -e.g. Steel cutting)

o   Conducting  Tool Box Talk (TBT) based on risk assessment

o   Arranging for appropriate tools and necessary skilled work force as required.

o   Ensuring the works are carried out as per approved and latest drawing/documents

o   Ensuring for  Housekeeping always at work place

o   Implementing the control measures as per risk assessment and also as mentioned in the permit.

o   Close monitoring till completion of work.

o   Close the work permit after restoration of work spot.

·          Workmen (Subcontractor/Supplier)

o   Wearing appropriate PPEs.

o   Understanding and following the instructions given by line staff.

o   Following the scaffolding tag system

o   No horseplay and shortcuts.

o   Informing the supervisor/foreman about any near misses, injuries and unusual

·        Safety Officer (Subcontractor)

o   Ensures all safety measures implemented/followed as per risk assessment and HSE Plan

o Should inform the site engineer for any deviations from required procedure/standard practice

o   Should conduct a safety briefing in co-ordination with site engineer/supervisor over a specific HSE issue

o   Ensure all First aid cases are entered in first aid register and  necessary awareness given to the victim

o   Ensures for inspection of power tools and scaffolding               

·       Surveyor (Subcontractor)

o   To check the levels, coordinates and alignments of every work activity at site.

·       Organization Chart (see for attachment)

6). SEQUENCE OF ACTIVITIES WITH RESPONSIBILITIES

6.1            Pre-commencement Requirements

·       Approval of work procedures shall be obtained from O/E prior to the start of activity.

·       Asphalt mix design test results shall be submitted to the O/E’s review.

·       Safety regulations as per specifications and standard shall be followed

6.2            General  Requirements

Before start of the work the following shall be ensured:

·       Tools, Equipment & Machinery is suitable and approved for use.

·       Availability of suitable quantity of approved material for the works as per specification and O/E requirements.

·       Area clearance obtained from other discipline/subcontractor.

6.3            Co-ordination with other trades

·       No Laying of asphalt road work to be started unless it is cleared for Laying works.

·       Prior to start the works, check all architectural, mechanical and electrical works are completed and MEP clearances shall be taken as required.

6.4            Delivery, Storage & Handling of Materials

·       All materials shall comply with the specifications regarding quality, dimensions, strength etc.

·       The material shall be approved and shall be used as per the Approved drawings.

·       Materials received at site shall be checked by O/E.

·       Sampling / testing to be done as per requirements of specification

6.5          Execution : Procedure for laying Asphalt road works

A)   Surface Preparation

·      The surveyor shall mark the road center line and width of the embankment prior to starting of any road works; The CONTRACTOR shall make detail survey of the existing services (If any) by the side of the road or crossing the road

·      Surveyor shall make a survey report for the existing levels prior to filling or cutting and engineer should make sure for the same

·     All the road works and road crossings must be executed as per the approved drawings and as per project specifications.

B)    Road embankment

·       Embankment shall be installed on top of the existing natural ground, thickness of this layer shall be at least 30 cm

·       Material to be used for road embankment shall be A-1-a OR A1-b or A-2-4 in accordance with AASHTO Soil Classification System (from AASHTO M 145 or ASTM D3282).

·     Every layer should be compacted with heavy compactor and the compacted density of the soil shall be equal to or greater than 95% M.D.D., with no single value below 92%.

C)   Sub-Grade

·       Ensure that approved sub-grade material is used and the material sample shall be collected and tested as per project specifications upon receiving of material at site.

·       Sub-grade material shall be placed above embankment filling

·       The approved Sub-grade material shall be back-filled to the thickness of 300 mm and it should back-filled in two layers (each layer 150 mm ).

·       Compaction of sub-grade shall be facilitated by means of a 10-12 ton roller, rolling shall be continue to achieve the Max. Dry Density(MDD) of 98% as per approve drawings and project specifications.

·       Thickness of sub-grade shall not be less 300 mm as specified in the approved drawings

·       The formation shall be shaped and graded to an even and uniform, well filled surface, shaped similarly to the finished surface of the road 

·       Compaction test shall be done by approved laboratory for the Sub grade.

D)   Laying of Kerbstones

·       The above work shall be carried out according to the Method statement submitted vide WS-CRN-DAR-CV-MS-1360 dated 22.10.2018.

·       Laying of Kerb stone shall be inspected and approved by O/E.

E)    Sub-Base

·       Ensure that approved sub-base course material is used and the material sample shall be collected and tested as per project specifications upon receiving of material at site.

·       Thickness of sub-base course shall be 200 mm as specified in the approved drawings, and it shall be placed in two layers.

·       Sub Base material spreading shall be started after receiving the compaction test results of Sub Grade.

·       Sub-base material loads shall be spread outside area on which it is spread to ensure that no segregation occurs and it shall be spread evenly using a grader to maintain the levels and thickness of layers.

·       Each layer shall be  must be compacted to an average of 100% of MDD with no single value below 98%

·       Minimum field density tests shall be one test for every 300 m²  of granular sub-base laid

·       Minimum material test requirement shall be one sample for every 1,000 cum of material and test shall be as follows grading, plasticity index, sand equivalent, MDD, and CBR, loss by abrasion by the approved laboratory as per the project specifications.

F)    Aggregate Base Course (ABC):

·       Ensure that approved sub-base course material is used and the material sample shall be collected and tested as per project specifications upon receiving of material at site.

·       Thickness of sub-base course shall be 150 mm as specified in the approved drawings.

·       Aggregate base course material spreading shall be started after receiving the compaction test results of Sub Grade.

·       Aggregate base course material loads shall be spread outside area on which it is spread to ensure that no segregation occurs and it shall be spread evenly using a grader to maintain the levels and thickness of layers.

G)   Prime Coat (MC1):

·       Ensure that approved material is used and each consignment test certificate for prime coat (MC-70) shall be provided.

·       Prime coat shall be tested as per project specifications.

·       Prime coat shall be applied between road base course and bituminous base course as per approved drawings

·       The same shall be cured for a curing period of 48 hours prior to laying of bituminous base course

·       Bituminous material for the prime coat shall be applied in quantities of at least 0.7 ltr/m², not exceeding however 1.50 ltr/m².

H)   Bituminous Base Course (BBC):

·       Ensure that approved Bituminous base course material is used and each consignment test certificates shall be provided for Asphalt cement used (AC 40-50).

·       Bituminous base course shall be of thickness 90mm as per approved drawings.

·       Bituminous base course shall not be placed during dusty, foggy and Rainy weather.

·       Bituminous base course material shall be transported in trucks from hot mix plant & its final placement temperature shall not be less than 150º C.

·       Consistency of mixture shall be checked for each 200 tons.

·       Site engineer in coordination with surveyor must ensure laying of bituminous course to the correct levels and to the specified longitudinal and cross section profiles.

·       The Bituminous base course shall be evenly placed by mechanical spreader on a clean base in a manner that it does not become segregated.

·       The seams of the bituminous base course shall be sufficiently staggered against each other and it should be executed straights, longitudinal if necessary being adapted to the road alignment.

·       Bituminous base course shall be compacted evenly over the entire surface by using pneumatic & steel roller.

·       Gradient slope shall be maintained as per approved drawings.

·       The core sample to be taken after compaction to determine the layer thickness and the MDD as per project specifications.

I)     Tack Coat (RC2):

·       Ensure that approved material is used and each consignment test results shall be provided for Tack Coat (RC2).

·       Tack coat shall be tested as per project specifications.

·       Tack coat shall be applied between bituminous base course and the wearing course as per the Project Drawings.

·       Tack coat shall be cured for at least 1 hour

·       Tack coat shall be applied in quantities of at least 0.3 ltr/m², not exceeding, however 0.60 ltr/m²

J)     Wearing Course (BWC):

·       Ensure that approved material is used and each consignment test certificates shall be provided for Asphalt Cement used (AC 40~50).

·       Temperature of mixture to be measured at site and it should not less than 150⁰C.

·       Consistency of mixture shall be checked for each 200 tons.

·       Thickness of wearing course shall be 60 mm as per approved drawings

·       Wearing course shall be placed in one layer above the bituminous base course and one coat of tack coat shall be applied between bituminous base course and wearing course.

·       The Wearing course shall be evenly placed by mechanical spreader on a clean base in a manner that it does not become segregated.

·       The seams of the wearing course shall be sufficiently staggered against each other and it should be executed straights, longitudinal if necessary being adapted to the road alignment.

·       Wearing course shall be compacted evenly over the entire surface by using pneumatic & steel roller.

·       Site engineer in coordination with the surveyor must ensure the top levels and slope is maintained as per approved drawings.

·       The core sample to be taken after compaction to determine the layer thickness and the MDD as per project specifications.

K)   Temperatures

·       Temperature shall be checked whenever material is delivered to site

·       Aggregate ingredient shall be heated to a temperature between 160ᵒ to 179ᵒC

·       Asphalt cement shall be heated to a temperature between 146ᵒ and 156ᵒ C at mixing time

·       All bituminous mixtures shall leave the paver at a temperature not less than 150ᵒC

·       Prime coat (MC1) between 50ᵒ and 80ᵒC

·       Tack Coat (RC2) between 10ᵒ and 50ᵒC

L)    Joints

·       Longitudinal joints in asphalt courses shall be offset by 300 mm in relation to the longitudinal joints of the underlying course

·       Transverse joints in succeeding layers shall be offset by at least 2 m. The same shall apply when new pavement is laid in contact to an existing, which will be cut back in steps, 2m wide in each of its layers

·       At transverse joints the previously laid work shall be cut to a vertical edge. Before laying the material against it, the vertical edge to be painted with hot bitumen

·       Minimum number of joints to b exercised/considered during execution

M)  Compaction of Mixtures

·       After spreading and strike-off, the rolling operation by pneumatic and stell roller shall start immediately and shall operate as close as possible to the paver without excessive tearing

·       Rolling will not be prolonged till cracks appear

·       The asphalt layer shall be compacted to a minimum degree of 98% of compaction

N)   Thickness of Cores

·       Depth of each bituminous paving course shall be measured by cored samples

·       Samples shall be one sample for 600 M²

·       Cored sample shall be 10 cm in diameter (nominal)

O)   Surface Tolerances

v Non Bituminous Courses

·      The thickness and cross section as shown on the approved drawings shall not vary more than -5 mm to +10 mm from the required elevations.

v  Bituminous Courses

·       Maximum variations allowed for 3 M shall be :

Ø  Base Course      = 4 mm

Ø  Wearing Course = 3 mm

P)    Road Markings

·       Road markings shall be applied wherever necessary or as directed by ENGINEER to control and direct the traffics.

·       Road markings shall be marked by thermoplastic as per project specifications.

·       Road markings shall be sprayed on the road in an even thickness of 2.0 mm.

Q)      Inspection and Testing

·       Each activity like back-filling of Sub grade and Sub base, In-situ Density test for Sub base & Sub grade and laying of Bituminous base course and Wearing course work shall be intimated to O/E through inspections.

·       After due completion of laying of Asphalt work shall be offered to O/E’s inspection and comments on the work shall be rectified and notified for re-inspection if any.

·       Testing of each consignment delivered to the site shall be carried out as per the specifications for road works of RIYADH AMANAH.

       7). REQUIREMENTS

7.1    Plans /Records and Job instructions (Documentations)

Before commencing the work the following things should be available:

·         Inspection request for materials, erection & installation

·         Approved drawings / Material approval for the work

·         Method statement for the work

·         Key site plan for that work area

·         All inspected tools & machineries

·       Emergency escape route without obstructions

·       Clearance from Electro-Mechanical incharge

7.2    Training

·       Trained/Experienced & Skilled persons shall be used for the work

·       All operator / Laborers are safety trained and toolbox shall be conducted for the each potential hazards mentioned in the Risk assessments.

7.3    PPE (Personal Protective Equipment)

·       Protective clothing

·       Protective gloves

·       Safety helmet

·       Safety goggles

·       Hard Gloves

·       Hi-visibility jacket

·       Flagging tape

·       Warning tape

·       Flasher light

·       Safety Harness (above 1.8m)

7.4    Equipment and Tools required

·         Manpower requirement

1.               General Supervisor/Foreman  - 01 no

2.               Charge hand                            - 02 nos.

3.               Mason                                     - 02 nos

4.               Helpers                                   - 06 nos.

5.               Electrician                              - 01 no.

·         Equipment

1.     Shovel

2.     Compaction roller machine

3.     Spreader

4.     Trucks

5.     Sprit level

6.     Plumb bob

7.     Electric air blower/Air compressor for cleaning

8.     Drilling Machine

9.     Hammer

10.  Measuring Tapes

11.  Marker

7.5    Risk Assessment

·       Risk assessment to be ensured that it is available in the work spot

·       All control measures as per risk assessed to be implemented and ensured before start of work

·       All workers shall be made aware of the risk involved in carrying out the activity and requirement of control measures during toolbox talk

8).   HSE & EMERGENCY PROCEDURES

    HEALTH, SAFETY & ENVIRONMENT (HSE)

v The entire works will be carried out as per the guidelines established in the Project Specific HSE Plan

v Utmost importance shall be given to safety or personnel and protection of existing above/under ground services. It will be ensured that the personnel involved are thoroughly aware of the safety regulations. To achieve the above the following shall also be ensured:

·       Tool box meetings will be conducted before starting the works

·       All personnel will be provided with suitable personal protective equipment

·       Required permits will be obtained from the authorities concerned before starting the works, if any

·       Plant & equipment will be fully tested for safety compliance

·       Proper and safe access will be provided for workers to reach the work spot and carry out their works safely

·       Necessary and essential lighting and ventilation will be provided during the course work to protect labor from suffocation

·       Scaffolding and working platforms provided to facilitate the works will be checked frequently for its safety

·       The necessary safety measures will be taken to prevent accident or injury all the times. This may include barriers, warning tape / net, signage, watchman, flashing & rotating lights at night

·       Heat Stress training will be provided during summer season

·       Provision of adequate cool drinking water, shades if necessary will be arranged in place

·       Plants & Equipment will be provided with back-up lights and all other applicable safety devices

    Emergency Procedure

·       In case of any emergency situation the workmen should follow the emergency response procedure and must gather in the assembly point. The emergency response procedure should be conveyed to the work men through the toolbox talk in prior to the carrying out of the activity.

·       The necessary safety measures will be taken to prevent the accident or injury all the times. This may include barriers, warning tape, net, signage, watchman, flashing & rotating lights at night.

·       MSDS shall be made available prior to the start of the job

·       Heat stress training will be provided during summer season.

·       Provision of adequate cool drinking water, shades if necessary and salt tablets will be in place.

·       Plants & equipment will be provided with back up lights and all other applicable safety devices.

v  In case of major Injuries

Ø  Do not panic. Call ambulance and notify emergency team at site

Ø  Do not move the injured unless he is in danger

Ø  If danger exists, he shall be assessed by a trained and qualified first aider before moving.  Use a stretcher.

Ø  Do not crowd around the victim. Do not give anything to eat or drink.  Ensure adequate air and lighting.

Ø  Only trained and qualified first aider shall treat the victim and ensure that his airway is kept clear.

Ø  Victim shall be transported to hospital in an ambulance.

Ø  Preserve the accident scene for further investigation.

v In case of Fire

Ø  Follow Amanah/s approved emergency procedure as per HSE Plan.

v In Case of Flood

Ø  Evacuate immediately to the nearest highest location you are in.

Ø  Notify the Emergency Controller of the site

v EMERGENCY CONTACT NUMBERS:

Name	Position	Contact Nos.
	Project Manager
	Site Manager
	Safety Officer
	Fire Fighter / First Aider
	Pick Up driver

  

POLICE	999
AMBULANCE	998
FIRE SERVICE	997
HOSPITAL	HMG 011 4909999

  

  

9). REFERENCES:

§ S-TR-CIVIL-Road (Rev.0-2010)

§ Project Quality Plan (PQP)

§ Project HSE Plan

§ Drwg. No. N7204.1E-R-E-5370-S-7151 Rev. A Sheet 1~1

§ Drwg. No. N7204.1E-R-E-5370-S-7201 Rev. A Sheet 1~1

§ Drwg. No. N7204.1E-R-E-5370-S-7212 Rev. A Sheet 1~2

§ Drwg. No. N7204.1E-R-E-5370-S-7401 Rev. A Sheet 1~1

§ Drwg. No. N7204.1E-R-E-5370-S-7402 Rev. A Sheet 1~1

§ Drwg. No. N7204.1E-R-E-5370-S-7351 Rev. A Sheet 1~1

§ Drwg. No. N7204.1E-R-E-5370-S-7352 Rev. A Sheet 1~1

§ Drwg. No. N7204.1E-R-E-5370-Q-7001 Rev. A Sheets 1~7

§ Drwg. No. N7204.1E-R-E-5690-H-7113 Rev. A Sheets

§ Ref. No. N7204.1E/MASS/0235- ASPHALT MIX DESIGN

           

10). ATTACHMENTS:

ü  S-TR-CIVIL-Road (Rev.0-2010)

ü  Organization Chart

ü  Risk assessment sheets

ü  Approval copy of Asphalt Mix Design                                   

ü  Standard Drawings                                                       

ü  Reference Drawings                                                       

--------------------------------------------------------------------------------------------------------

Method Statement for Asphalt Paving Works

(Civil Engineering)

Effective Date:
Document No.:
Approved By:    Eng. Muhammad Arif

PROJECT NAME: --------------------------------------------------------------------------

SAMPLE 2

1. Scope:

The scope of work of this method statement is to describe the responsibilities of personnel involved, execution procedure, safety factors and documents to be recorded for Asphalt Paving Works.

2. Relevant Process/Specifications:

     Tender Specifications

3. Responsibility:

The Construction Manager/Project Engineer is responsible for the asphalt paving works.

The Civil Construction Contractor’s Safety Officer shall ensure that necessary work permits are availed before the work commences and that the work is carrying out in safe manner.

The responsibility of the survey activities lies with asphalt paving work subcontractor. The survey team of civil construction contractor shall verify the data frequently.

Inspection and testing activities shall be controlled by the QC Engineer of Civil Construction Contract or through the site laboratory of Company.

4. Plants and Equipment:

Bitumen spray tankers, asphalt paver, Tandem steel roller, hand rollers, asphalt batching plant, etc.

5. Execution Procedure:

Prior to Commencement:

Safety:

Prime importance shall be given for personnel safety and protection of utility lines/services. It shall be ensured that the personnel involved are aware about the Company Safety regulation and confirm that the machinery are regularly maintained. Further to above, the following key points shall be considered important.

a. Copies of drivers/operator’s license vehicle’s registration and security passes to be submitted to Company safety department before commencing the work.

b. All moving vehicle/equipment shall have reverse horn.

c. Transporting of persons per vehicle is restricted to the number of seat belts available in the pickup.

d. Deep excavations shall be adequately shored, barricaded and warning signs & lights shall be posted.

e. Road safety signs/road diversion signs shall be installed wherever applicable for the safe movement of vehicles and equipment.

f. All major equipment shall be tested and certified by Third Party prior to mobilization to site.

Existing Services and Facilities:

a) Before commencement of the work, ascertain the nature and location of all existing above and underground services at site by visual survey and reviewing the service layout drawing (if available)

If any protection, re -routing, termination or removals of services are required for the smooth progressing of work, it shall be discussed and written approval shall be obtained from employer/ company as appropriate. For service protection, approved method of protection shall be adopted.

b) A warning tape shall be tied at a distance of 2 meters away from the services/as warning sign, to restrict the movement of the equipment.

Survey:

a) Establish and protect sufficient number of stations to re-establish the stations if they are disturbed during work.

b) Post wooden stack for line and gradient of the road.

c) The existing sand tracks shall be blocked, re-routed and traffic diversion signs shall be posted prior to the commencement of the work.

In-Process Procedure:

The execution procedures shall be divided into following sections, which are:

a) Prime Coat.

b) Binder course.

c) Tack coat.

d) Wearing course.

a) Prime Coat (MC1):

Quality of Primer should be as per BS:1707

Immediately before applying the prime coat (which shall be preliminary approved), the full width of the surface shall be cleaned with compressed air (Using Compressor).

i) The bituminous material for the prime coat (MC1) shall be applied by means of bitumen spray tankers.

ii) This shall be applied in a single layer at the rate of 0.7 – 1.5 liters /m² and at a temperature not exceeding 70° C. This surface shall be cured for 24 hours.

iii) The over spread area shall be cured more than 24 hours/ until excess prime coat is evaporated.

b) Bituminous Binder Course (BBC):

Quality of Binder should be as per AASHO-T182

i) Immediately before paving the binder course material (Bituminous Binder Coarse - BBC), the surface of the prime coat shall be cleaned with compressed air and shall be ensured that the surface is dry.

ii) The hot asphalt mix shall be brought from the approved mixing plant by 6 wheel trucks or trailers. Upon arrival at site, the asphalt mix shall be dumped into the asphalt paver.

iii) The asphalt paver shall lay the material to the required thickness and level.

iv) The mix shall be compacted as soon as possible after spreading the material. Tandem rollers shall follow the laying operation to carry out breakdown rolling up to temperature of 110°C- 120° C. Pneumatic tired rollers and tandem rollers shall follow the breakdown rolling and sufficient passes shall be made to achieve the required compaction.

Rolling shall start from the sides and proceed toward the center. Each trip of the roller shall overlap the previous trip by at least 30 cm. Roller wheel shall be kept moistened. The roller shall be capable of reversing without backlash and shall be free from worn parts.

Heavy rollers shall be used to complete all rolling including elimination of waves caused by the lighter rollers. Full compaction shall be obtained before the asphalt temperature reaches 100°C. Compaction shall be in accordance with specification of relevant standard.

v) The construction joints shall be prepared by cutting the layer vertically down by means of asphalt saw cutting machine or with jack hammer. The joint shall be cleaned well by compressed air and tack coat (RC2) material shall be applied on the vertical and horizontal surface for better bonding. Extremely good care shall be taken when asphalt is laid at construction joints.

vi) The areas inaccessible for heavy rollers shall be compacted with plate compactors or hand tampers. After reaching the base course top level, suitable fill material (Dune Sand) shall be dumped to the top level of base course on the sides of road shoulders. It shall be leveled, shaped (1:6 Ratios) and compacted to 90% maximum dry density.

c) Tack Coat (RC2):

i) The material (which shall be primarily approved) shall be applied at the rate of 0.3 to 0.6 lit/ m² at the temperature not exceeding 54°C above the binder and at where there is a joint with existing asphalt surface.

ii) The surface shall be cured for the period as per manufacturer’s recommendations until a tacky surface is visible.

d) Wearing Course (WBC):

i) The hot asphalt mix shall be spread over the cured surface of tack coat by automatic asphalt paver to the required profile and thickness.

ii) The mix shall be compacted as soon as possible after spreading the material. Tandem roller shall follow the laying operation to carry out breakdown rolling up to a temperature of 110°C- 120°C.

Self-propelled rollers and Tandem rollers shall follow the breakdown rolling and sufficient passes shall be made to achieve the required compaction.

Rolling shall start from the sides and proceed toward the center. Each trip of the roller shall overlap the previous trip by at least 30 cm.

Roller wheels shall be kept moistened. The roller shall be capable of reversing without backlash and shall be free from worn parts. Heavy tandem roller (CC-41) shall be used to complete all rolling including elimination of waves caused by the lighter rollers Full compaction shall be obtained before the asphalt temperature reaches 80°C. Compaction shall be in accordance with specification of relevant standard.

iii) Traffic shall not be allowed on this layer until it is properly cooled, a minimum period of 12 hours shall be considered after the completion of the rolling.

iv) The test holes shall me made good with hot asphalt mix and compacted using Marshal Hammer.

Inspection and Testing:

Testing shall be conducted by Company’s 3rd party site laboratory.

Relevant QC records shall be raised by Civil Construction Contractor’s QC Engineer. Also tests shall be carried out as per the Field Quality Control Plan (FQCP) of Asphalt Work.

Author: Eng. Muhammad Arif (Dar Al Handasah) Saudi Arabia