Concrete Design & Production - The Portland Cement AssociationThe paste, comprised of cement and water, binds the aggregates (usually sand and gravel or crushed stone) into a rocklike mass as the paste hardens.crushed stone sand design,Crushed Gravel as a Driveway Material - The SpruceNov 10, 2018 . Crushed gravel driveways are commonly composed of sand, silt, clay and larger aggregates (pebbles and small stones). . contrast, crushed gravel driveways, the subject of this article, have surfaces designed to shed water.
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