![]() Possible errors in lab include: temperature, entrapped air, uniformity of soil, and the soil mass examined. The specific gravity (2.488) adversely reflects comparable expected values, as typical soil values of specific gravity range from 2.65 to 2.80, and the ASTM D854 displays the average value of specific gravity for poorly graded sand, from a number of 18 tests, to be 2.660. ![]() The specific gravity of the soil sample was determined to be 2.488 by standard method per ASTM D854. The following equations shown below (Equations 1.2 to 1.7) were used to determine the value of specific gravity of the soil sample.įigure 1.1- Pycnometer in Specific Gravity Lab Results Next, modified phase diagrams were computed as shown in Figure 1.2 and Figure 1.3, from the data in Table 1.2 shown below. Equation 1.1 as shown below was used to determine the water content using the data shown in Table 1.1. Figure 1.0- Raw Data Collected during lab in grams Compiled Data and Calculations Usedįrom visual inspection the soil sample appeared to contain high water content, so an additional water content test was conducted to ensure precision of the determined specific gravity value. ![]() ![]() Summary of Raw Dataįigure 1.0 shown below displays the collected raw data from laboratory testing in units of grams. Specific Gravity is a unitless value that represents the ratio between the mass of a given volume of substance to an equivalent volume of water. ![]()
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