QAQC in Construction

ABSTRACT: Corrosive soils are responsible for the deterioration of buried underground utilities such as buried steel pipes. Frequent pipe failures are reported due to corrosive soil globally. Although soil’s corrosion phenomenon has been understood and identified long time ago, pipe failures due to corrosive soil are uncontrollable and unavoidable despite the use of protective coatings and techniques such as cathodic protection. Therefore, it is essential to review the causes of soil’s corrosivity for the protection of steel pipes. This chapter demonstrates the influence of varying moisture and chloride contents of soils on the corrosion of coated and uncoated steel pipes. Carbon steel specimens (coated and uncoated) were buried in soils of 20, 40, 60, and 80 wt.% moisture content, respectively, while the chloride concentration introduced in soil was 0, 5, and 10 wt.%, respectively. Through the analysis of experiments, it is revealed that the corrosion rate of pipes buried in soil ...

Method Statement for Construction These are the method statements, Mostly we use in our projects and accepted by Engineers whom we worked with. These method statements are also used by Project Manager, Construction Manager, Project Engineer, Site Engineer, Quality Engineer, Quantity Surveyors and many more. Be familiar now with learning and reading these method statements and eventually use these on your project. Method Statement for Substructure 1. Method Statement for Excavation & Back-filling Works 2. Method Statement for Blinding Works 3. Method Statement for Anti-termite Works 4. Method Statement for Application of Bituminous Waterproofing Works 5. Method Statement for Application of Waterproofing Membrane 6. Method Statement for Sand Protection During Casting of Blinding 7. Method Statement for Footing Concrete Pouring 8. Method Statement for Kerbstone & Interlock Works 9. Method Statement for Road Works 10. Method Statement for Dewatering Works 11. Method Sta...

ROCKFILL: Rockfill will generally be natural materials that are hard, durable, and larger than gravel size. Rock-fill may contain only trace amounts of sand or fine-grained soil materials; however, various amounts of sand and fine-grained materials may be allowed by some specifications. Riprap materials differ from rock-fill in that they are generally clean materials of a specified gradation. Rockfall materials may be from a source on the construction site or from offsite sources. On some occasions, rock-fill materials may be of less durable onsite materials that are more weathered, but are being used as a zoned fill for purposes of economy. These types of materials will breakdown during the processing and compaction, so close attention needs to be given to specified methods and field test results. Borrow sources (onsite or offsite), gradation, quality of rock-fill materials, processing, and compaction need to be clearly designated in the drawings and specifications. With respec...

SUBMITTAL PROCEDURE   Details     Last Updated: 25 November 2018 GENERAL INFORMATION: All materials proposed for use in concrete and all concrete mix designs shall be approved by the Client prior to use. Such materials include coarse and fine aggregates, cementitious materials, admixtures and water.  All materials shall be SAMPLED and TESTED after December 1st of the previous year or the most current testing data if ANNUALLY tested by MOC. All Client's approved mix designs for 2017-2018 will expire on December 31, 2018, even if mixes are used on multi-year construction projects. New mix designs must be submitted to CASPAR to remain an approved MOC supplier for 2019. Mix designs, meeting specification requirements, in PDF format, received by December 15, 2018 will be approved by the deadline.  MOC will preapprove aggregates and cementitious materials. Submit certifications directly to MOC. If the material is approved by MOC it will be add...

Soil types The type of soil determines the strength and stability of trench walls. Identifying soil types requires knowledge, skill, and experience. Even hard soil may contain faults in seams or layers that make it unstable when excavated. The foreman or supervisor must be knowledgeable about soil types found on a project and plan protection accordingly. This knowledge must include an awareness that soil types and conditions can change over very short distances. It is not unusual for soil to change completely within 50 metres or for soil to become saturated with moisture over even smaller distances. The Construction Regulation sets out four soil types. If you are unsure about the soil type, have the soil tested to confirm the type. Type 1 — It is hard to drive a pick into Type 1 soil. Hence, it is often described as “hard ground to dig”. In fact, the material is so hard, it is close to rock. When excavated, the sides of the excavation appear smooth and shiny. The sides will remain...