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Mining For Materials For Concrete
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Mining For Materials For Concrete

Mining For Materials For Concrete

Introduction Sand and gravel are used extensively in construction In the preparation of concrete for each tonne of cement the building industry needs about six to seven times more tonnes of sand and gravel USGS 2013b Thus the worlds use of aggregates for concrete can be estimated at 259 billion to 296 billion tonnes a year for 2012 alone

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