Determination of the liquid limit, plastic limit and plasticity index Lab Report

Determination of the crystalline cut back, plastic limit and plasticity exponent of a cohesive soil - Lab Report ExampleData plot was taken from the results of the liquid limit test, where the x-coordinates or abscissas are the calculated moisture contents and the y-coordinates or ordinates are the penetration. The data points include in the plot are P1 (63.37, 14.13) P2 (66.26, 18.90) P3 (69.58, 19.45) and P4 (70.44, 22.15). The trend line or the best fit line was automatically fitted and the equation of the line was generated. From the figure, the equation of the best fit line is y=0.9613x 46.148. From step (10) of the laboratory modus operandi for the determination of the liquid limit, the theoretical value of moisture content which would produce a penetration of 20 mm is the liquid limit of the soil. Hence, when y in the above equation is substituted with 20, the value of the liquid limit (x) may be calculated algebraically as y = 0.9613x 46.148. 20 = 0.9163x 46.148 0.9163 x = 20 + 46.148 x = 68.81 ? 69% - the liquid limit of the soil The value of the liquid limit obtained above is verified on a lower floor by manual plotting. Manual Plot of Moisture Content vs. Penetration Plastic Limits Test no 1 2 3 4 Container No.