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Measurement and identification of insoluble residues is a technique that can be used to estimate the resistance of carbonate rocks to weathering. Insoluble residue test results are presented for specimens of quarried rock from several locations in the midwest and are compared to results from sodium sulfate soundness tests. Rocks containing insoluble residues greater than 20% clay also have high sodium sulfate soundness loss and normally poor durability under surface weathering conditions. This is particularly true for eastern Ohio limestones formed in a freshwater environment.
insoluble residue, rock durability, riprap, soundness, rock weathering
Geologist, Soil Conservation Service, USDA, Columbus, Ohio