Table 3 shows that the liquid limit value for the soil sample is 62.8%, while its plasticity index is 28.7%. For soil sample to be classified into the A-7-5 subgroup; plasticity index\(\leq LL-30;28.7\leq 62.8-30=\ \left(32.8\right)\text{.\ \ }\)The soil sample therefore falls into the A-7-5 subgroup, also, based on the plasticity chart, A-7-5 soil sample is of high clay content (CH), soils with liquid limit values of more than 50% are of high clay content[28].
Table 3: Summary preliminary results of Soil sample B