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Several tests and requirements have been used routinely in the past 30 years for durability and quality of stone for use as riprap and armor. Among the tests are absorption, unit weight, abrasion, sulfate soundness, and freezing-thawing. The tests all give index values reflecting durability only indirectly. Some Federal agency guidance and the standard specifications of state highway departments are reviewed here to translate the index values into criteria for evaluating stone quality as far as suitability or unsuitability.
stone, erosion control, riprap, durability, specifications, guidance, quality, tests
Geologist, Geotechnical Laboratory, USAE Waterways Experiment Station, Vicksburg, MS
Petrographer, Structures Laboratory, USAE Waterways Experiment Station, Vicksburg, MS