Making Concrete Cylinders in the Field

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Classifying Soils for Highway Construction with AASHTO M145 / ASTM D3282

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There is no doubt that highways, roads, and airfields are crucial for modern transportation, as they literally lay the ground for extensive movement. However, during road construction, the ground is not always guaranteed to be viable; this is dependent on the soil profile, so there is a need to comprehend the properties of soil at the sub-grade level. AASHTO M145 / ASTM D3282 -15:  (Standard Practice for Classification of Soils and Soil-Aggregate Mixtures for Highway Construction Purposes) classifies soils from any geographic location into groups. This it bases on the results of laboratory tests it details to determine the particle-size characteristics, liquid limit, and plasticity index of soils. AASHTO M145 / ASTM D3282 -15  includes classification tables drawn from the American Association of State Highway and Transportation Officials (AASHTO) system, which originated as the Public Roads Classification System when Hogentogler and Terzaghi developed it in 1929. Th...
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Checklists for Quality Control Documents (QCD)

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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 ...
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Aggregates (Coarse and Fine)

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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...
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