描述了一种沉降试验，可在现场或实验室中用作细骨料中细粉土、粘土和类似材料含量的指南。对于已知通过75 m筛孔的细骨料，不建议进行该试验，因为粘土和细粉土不太可能与沉降柱中的砂粒大小的颗粒分离。该试验可能不适用于含有一些活性粘土的细骨料，因为这些粘土在沉降期间可能不会与砂分离。本试验不适用于测试人造砂。

Describes a settling test which may be used in the field or laboratory as a guide to the amount of fine silt, clay and similar materials in fine aggregates. The test is not recommended for fine aggregates known to have more than 10% passing the 75 mm sieve aperture as it is unlikely that the clay and fine silt will separate from sand-sized particles in the settling column. The test may not be suitable for fine aggregates containing some active clays as these clays may not separate from the sand during the settlement period. This test is not suitable for testing manufactured sands.