Crushed or natural stone used for drainage, road base, and concrete — one of the most common construction materials.
Loose aggregation of rock fragments ranging from 2mm to 64mm in diameter, used extensively in construction for drainage, base course aggregate, concrete mix, and erosion control. Crushed stone (angular) and rounded gravel have different properties; angular material provides better interlock and stability for base courses. Gravel is classified by size gradation according to ASTM or local specifications.
Six inches of compacted crushed stone base was required under all concrete paving to provide drainage and a stable subbase.
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