QAQC in Construction

1. Drying Shrinkage Concrete by nature is a porous material. This means that when it is curing, the water in the concrete takes up space. As concrete hardens, it loses its moisture through evaporation resulting in empty capillary pores and a slightly smaller shape. This process is known as drying shrinkage. Since concrete is very rigid, this shrinkage causes an increase in tensile stress, which may lead to, cracking, internal warping, or external deflection. Concrete cracks when the drying shrinkage stresses exceed the tensile strength of the concrete. The spacing and size of cracks depend on the amount of shrinkage, degree of restraint, and amount and type of reinforcement. Drying shrinkage is the number one reason for cracks in concrete. 2. Lack of / improper use of control joints Control joints are most commonly installed in slab-on-grade concrete that is used in places such as driveways, pavements, house slabs, basement floors, and industrial spaces.  Control joints are general...

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...