Sand equivalent test

{{Short description|Soil analysis test}}

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The sand equivalent test quantifies the relative abundance of sand versus clay in soil. It is measured by standardized test methods such as ASTM D2419, AASHTO T176, and EN 933–8.{{cite web|title=Sand equivalent test set|url=http://www.controls-group.com/eng/aggregates-testing-equipment/sand-equivalent-test-set.php|publisher=Control-Groups.Com|accessdate=1 September 2013}} The test is used to qualify aggregates for applications where sand is desirable but fines and dust are not. A higher sand equivalent value indicates that there is less clay‐like material in a sample.

During the test, material from the test specimen that can pass through a No. 4 sieve is mixed with solutions of calcium chloride, formaldehyde and glycerin in a cylinder. The content is then left for sedimentation. After about 20 minutes, the level of clay suspension and the sand level is read on the cylinder scale.