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Unformatted text preview: ring properties. STANDARD REFERENCE ASTM D D4318–10 – Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils THEORY Liquid Limit Definition: ‐ the moisture content, in percent (%), required to close a distance of 13mm along the bottom of the groove after 25 blows. ‐ the boundary between semi‐liquid and plastic states The objective of this procedure is to mix soil samples of a consistency such that the number of blows required to close the groove will be above and below 25. The number of blows should be less than 60 and greater than 10 with recommended trials at approximately 35, 30, 20 and 15 blows. The test proceeds from the dry side to the wet side (higher number of blows to lower number of blows). If the soil becomes too wet, do not add dry soil because it would be necessary to cure the new batch; i.e. the addition of the dry soil would not have enough time to absorb all the water properly. Plastic Limit Definition: ‐ the moisture content, in percent (%), at which soil crumbles when rol...
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