Sand cone test - Soli lab report


        When a sample of soil is classified as being suitable to be used in certain earthwork( after performing several tests on it in the lab), it is necessary as well to do some tests on the soil in the field to check if it satisfies some engineering specifications or not, such as: compaction. Compaction is done to decrease the spaces in order to increase the unit weight, reduce settlements, decrease permeability and increase the bearing capacity of the soil. A well-compacted soil must achieve a dry unit weight of more than 90% of the maximum dry unit weight which is determined in the lab using the standard or modified proctor test. The unit weight of a compacted soil in the field can be calculated using the sand cone method or the rubber balloon method or the nuclear gauge method. In this experiment the sand cone method is used to calculate the unit weight of soil.

Sand cone test is a simple and useful test in which the density and unit weight of the compacted soil can be determined to achieve the required degree of compaction. The sand cone consists of a plastic jar for the calibrated sand, a metal cone, stopcock-controlled outlet and a base plate.

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