QAQC in Construction

  Design Mix: This test helps in determining the suitable ingredients of concrete and determining their relative amounts with the objective of producing concrete of the required strength, durability, and workability as economical as possible is termed as concrete mix design. It involves studying properties of Aggregate, Cement, Water & Admixture (if any), and is used to determine the proper Concrete Mix Design. Ref: ACI 211.1 Ultrasonic Survey: Ultrasonic concrete testing is based on the pulse velocity method to provide information on the uniformity of concrete, cavities, cracks, and defects. The pulse velocity in a material is directly proportional to its density and its elastic properties which in turn depends on the compressive strength and the quality of the concrete. It is, therefore, feasible to obtain information about the properties of components by sonic investigations. Test Method: IS 13311 (Part 1) Chloride Content: Measuring the calcium chloride content of...

Aggregates are inert granular materials such as sand, gravel, or crushed stone that, along with water and portland cement, are an essential ingredient in concrete. For a good concrete mix, aggregates need to be clean, hard, strong particles free of absorbed chemicals or coatings of clay and other fine materials that could cause the deterioration of concrete. Aggregates, which account for 60 to 75 percent of the total volume of concrete, are divided into two distinct categories--fine and coarse. Fine aggregates generally consist of natural sand or crushed stone with most particles passing through a 3/8-inch sieve. Coarse aggregates are any particles greater than 0.19 inches but generally range between 3/8 and 1.5 inches in diameter. Gravels constitute the majority of coarse aggregate used in concrete with crushed stone making up most of the remainder. Natural gravel and sand are usually dug or dredged from a pit, river, lake, or seabed. Crushed aggregate is produced by crushing quarry r...

The physical and mechanical properties of the interlocking concrete blocks shall conform to the following requirements.  A. Bulk Density (min. 48 hrs. immersion): Average > 2.375 T/m3 Minimum = 2.330 T/m3 9  B. Bulk/Apparent Density Ratio (min. 48 hrs. immersion) Average > 0.88 Minimum = 0.87  C. Water Absorption (min. 48 hrs. immersion, tested according to ASTM C140) Maximum = 3% for aggressive exposure zones1 4.5% for less aggressive exposure zones2  D. Compressive Strength (min. 48 hrs. Immersion tested according to BS 6717:1993) Average ≥ 55 Mpa for aggressive exposure zones, and 49 for less aggressive exposure zones Minimum = 47 Mpa for aggressive exposure zones, and 44 for less aggressive exposure zones  E. Abrasion Resistance (for vehicular areas only, tested as per ASTM C418) Average thickness loss < 3 mm Maximum volume loss = 150 mm3 per 500 mm2 Or comply with BS EN 1338 (maximum volume loss 20,000 mm3 per 5,000 mm2  F. Flexural Stren...

Updated on 06.02.2021 1. Checklist for Supplier Approval (SPA) Company Profile of Supplier / Manufacturer Financial Stability of the Company (Last 3 Years Financial Report) Government/Commercial Certificates (Ministry of Commerce, Chamber of Commerce, GOSI, Zakat, VAT, Saudinization, SAGIA - If Non-Saudi Company, etc.) Quality Certificates for Company (ISO) SASO Certificate / Product Registration with SABER.SA List of Project (Completed / Going on) List of Valid Products / Services Project Requirements Overview (Project Scope) List of Required Products and Products Overview Risk Management Quality Control Plan (QCP) Health and Safety Plan (HSE) Copy of approval from Riyadh Amanah / Other Government Clients Copies of pre-qualification (Approvals) by other Consultants or Contractors Product Availability Warranties (Only Required for Sub-Contractors) Company / Factory / Industry Photo Gallery (If Available) Contact / Address / Location Map 2. Checklist for Material ...

  Soil compaction is an operation common to most construction projects and increases the strength and stability of soils to support earthworks, structures, and pavements. Techniques to achieve maximum soil density are well known, and the outcomes can be tested and quantified using standard methods. Soil material is placed in layers, or lifts, in depths from a few inches to a foot or more, and compaction equipment rolls, kneads, vibrates, or sometimes uses dead-weight to consolidate the soil. The Right Kind of Compaction Test Specifications for soil compaction are established during the design phase of the project and depend on both total loads anticipated and whether those loads will be static or dynamic. Judging the adequacy of compaction efforts using qualitative measurements like penetration resistance or observation of wheel traffic is not sufficient to determine if the specifications have been met. Standard Proctor specifications (ASTM  D698  / AASHTO  T 99 ) wo...