The selection of good quality coarse aggregate is essential for the production of concrete that meets the desired strength and durability requirements. Ideal construction aggregate should have a rough surface texture and should be clean, strong, and free from the coating and other dirt particles.
Coarse aggregates with a size of 20 mm or less are commonly used for most concrete construction. One can roughly check the surface texture, particle shape, and cleanliness of the coarse aggregate just by visual observation. However, porosity and gradations require specific laboratory tests.
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