The American Society for Testing and Materials publishes an exhaustive listing of specifications including ASTM D 692 and ASTM D 1073 for various construction aggregate products, which, by their individual design, are suitable for specific construction purposes. The same classification sizing is used for larger armour stone sizes in EN 13383, EN 12620 for concrete aggregate, EN 13242 for base layers of road construction and EN 13450 for railway ballast. Preferred for road construction are given in EN 13043 as d/D (where the range shows the smallest and largest square mesh grating that the particles can pass). Although most kinds of aggregate require a form of binding agent, there are types of self-binding aggregate which do not require any form of binding agent. to help prevent differential settling under the road or building), or as a low-cost extender that binds with more expensive cement or asphalt to form concrete. In other words, aggregates are used as a stable foundation or road/rail base with predictable, uniform properties (e.g. Aggregates are also used as base material under foundations, roads, and railroads. Due to the relatively high hydraulic conductivity value as compared to most soils, aggregates are widely used in drainage applications such as foundation and French drains, septic drain fields, retaining wall drains, and roadside edge drains. Aggregates are a component of composite materials such as concrete and asphalt the aggregate serves as reinforcement to add strength to the overall composite material.
Aggregates are the most mined materials in the world. A gravel and sand extraction facility in Međimurje County, Croatia.Ĭonstruction aggregate, or simply aggregate, is a broad category of coarse- to medium-grained particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates.
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