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LABORATORY TEST <br />SIGNIFICANCE AND PURPOSE <br />TEST SIGNIFICANCE PURPOSE <br />California Bearing Used to evaluate the potential strength of subgrade soil, Pavement Thickness <br />Ratio subbase, and base course material, including recycled Design <br /> materials for use in road and airfield pavements. <br />Consolidation Used to develop an estimate of both the rate and amount of Foundation Design <br /> both differential and total settlement of a structure. <br />Direct Shear Used to determine the consolidated drained shear strength Bearing Capacity, <br /> of soil or rock. Foundation Design, <br /> and S/o a Stability <br />Dry Density Used to determine the in-place density of natural, inorganic, Index Property Soil <br /> fine-grained soils. Behavior <br />Expansion Used to measure the expansive potential of fine-grained Foundation and Slab <br /> soil and to provide a basis for swell potential classification. Design <br />Gradation Used for the quantitative determination of the distribution of Soil Classification <br /> particle sizes in soil. <br />Liquid $ Plastic Limit, Used as an integral part of engineering classification Soil Classification <br />P/asticitylndex systems to characterize the fine-grained fraction of soils, <br /> and to specify the fine-grained fraction of construction <br /> materials. <br />Permeability Used to determine the capacity of soil or rock to conduct a Groundwater Flow <br /> liquid or gas. Analysis <br />pH Used to determine the degree of acidity or alkalinity of a Corrosion Potential <br /> soil. <br />Resistivity Used to indicate the relative ability of a soil medium to carry Corrosion Potential <br /> electrical currents. <br />R-Value Used to evaluate the potential strength of subgrade soil, Pavement Thickness <br /> subbase, and base course material, including recycled Design <br /> materials for use in road and airfield pavements. <br />Soluble Sulphate Used to determine the quantitative amount of soluble Corrosion Potential <br /> sulfates within a soil mass. <br />Unconfined To obtain the approximate compressive strength of soils Bearing Capacity <br />Compression that possess sufficient cohesion to permit testing in the Analysis for <br /> unconfined state. Foundations <br />Water Content Used to determine the quantitative amount of water in a soil Index Property Soil <br /> mass. Behavior <br />1 f~rracon <br />