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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]
In 2023, the aggregate industry in the United States mined and sold 1.5 billion tons of crushed stone valued at more than $24 billion and 920 million tons of construction sand and gravel valued at $11 billion. [1] [2] There are thousands of aggregate-producing companies in the US, operating in each of the 50 states, and employing 105,000 people.
In 1906 the state mineralogist of California reported on 52 granite quarrying areas in 17 counties. [ 2 ] Many quarries were opened temporarily to provide stone for one or a few local or regional construction projects, but could not compete later when railroads allowed for economical transportation of heavy building materials to the area.
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As with many of Kaiser's entities the Permanente operation was a web of bank loans and partnerships with the other construction companies. Bank of America loaned $7 million for the cement plant and another $3.5 million was capitalized with investments from the other members of Six Companies, Kaiser's partners in the construction of Boulder Dam.
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Sand is often used in manufacturing, for example as an abrasive or in concrete. It is also used on icy and snowy roads usually mixed with salt, to lower the melting point temperature, on the road surface. Sand can replace eroded coastline. [4] Some uses require higher purity than others; for example sand used in concrete must be free of ...