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.
Gravel feeds many bid line items at once base course, drainage backfill, pipe bedding, and concrete aggregate so pricing depends on getting the correct gradation, angularity, and quantity right for each use. Because it is sold by the ton or cubic yard with separate haul costs, small errors in volume or conversion factors compound quickly across a large site package.
An estimator prices 1,200 tons of crushed angular base under the parking lot, converting from plan cubic yards using the supplier's compacted density and adding haul from the nearest quarry.
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