Describe How to Test for Soil Coarseness

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The Answer is To test for coarseness, all soil particles larger than 3 in. in diameter are removed from the sample. The remaining particles are separated through a No. 200 sieve, which permits the smallest particles that can be seen by the naked eye to pass through. If more than 50 percent of the sample by weight does not pass through the sieve, the sample is a coarse-grained soil. The coarse sample is then divided into particles larger and smaller than 1/4 in. (6 mm). If more than 50 percent of this sample by weight is larger than 1/4 in. (6 mm), the sample is classified as gravel. If more than 50 percent by weight is smaller than 1/4 in. (6 mm), the sample is classified as sand.

Describe How to Test for Soil Coarseness

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