Aggregates are obtained from natural sand or sand and gravel pits, hard rock quarries, dredging submerged deposits, or mining underground sediments. For more information about how aggregates are extracted, view our animated process.
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Gravel / ˈ ɡ r æ v əl / is a loose aggregation of rock fragments. Gravel is classified by particle size range and includes size classes from granule to boulder sized fragments.In the Udden Wentworth scale gravel is categorized into granular gravel and pebble gravel . ISO 14688 grades gravels as fine, medium, and coarse with ...
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