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Sharp sand, also known as grit sand or river sand and as builders' sand, concrete sand, or ASTM C33 when medium or coarse grain, is a gritty sand used in concrete and potting soil mixes or to loosen clay soil [1] as well as for building projects. It is not cleaned or smoothed to the extent recreational play sand is. It is useful for drainage. [2]
Cob: Cob is a building material consisting of water, organic material (like straw), lime, and subsoil, which largely consists of sand. Coarse sand makes up as much as 75% of cob. Concrete: Sand is often a principal component of this critical construction material. Glass: Sand rich in silica is the principal component in common glasses.
Construction aggregate, or simply aggregate, is a broad category of coarse- to medium-grained particulate material used in construction. Traditionally, it includes natural materials such as sand, gravel, crushed stone. As with other types of aggregates, it is a component of composite materials, particularly concrete and asphalt.
Ceramic aggregates with a density below that of water are used for low density structural concrete. These aggregates may include expanded clays and shales, preferably with water absorption below 10%. For structural concrete only coarse low density aggregates are used, with natural sand as the fine aggregates.
Once separated, the broken concrete is then sent to a wet recycling process, where the coarse fraction of broken concrete is washed to produce clean aggregate, whereas the residue generated from the washing process is sent to landfill in the form of sludge. [16]
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> 50% of coarse fraction retained on No.4 (4.75 mm) sieve clean gravel <5% smaller than No.200 Sieve GW well-graded gravel, fine to coarse gravel GP poorly graded gravel gravel with >12% fines GM silty gravel GC clayey gravel sand ≥ 50% of coarse fraction passes No.4 (4.75 mm) sieve clean sand SW well-graded sand, fine to coarse sand SP
Very coarse soil Large boulder lBo >630 >24.8031 Boulder Bo 200–630 7.8740–24.803 Cobble Co 63–200 2.4803–7.8740 Coarse soil Gravel Coarse gravel cGr 20–63 0.78740–2.4803 Medium gravel mGr 6.3–20 0.24803–0.78740 Fine gravel fGr 2.0–6.3 0.078740–0.24803 Sand Coarse sand cSa 0.63–2.0 0.024803–0.078740 Medium sand mSa
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