The following are the results of laboratory consolidation test conducted on clayey soil sample. Determine, graphically, the compression and recompression indices, Cc, Cr of this soil. Using Casagrande's method, determine graphically the preconsolidation pressure. 27 54 107 214 429 214 1.24 1.21 1.15 1.08 0.99 1.00

Consider that a 58.7 gram sample of dry soil is used in making a mechanical analysis by using the hydrometer method. The laboratory was held at a constant temperature of 20 C (68 F). The 40 s hydrometer reading was found to be 32.5 and the 8 hr hydrometer reading was 15.5. The percentage of sand in this soil sample is (note, a 58.7 gram sample is used here): Your Answer: Answer units

Situation 5 : A sample of saturated clay was placed in a container and weighed. The weight was 6N. The clay in its container was placed in an oven dray for 24 hours @ 105℃. The weight reduced to a constant weight of 5N. The weight of the container is 1N. If Gs = 2.7, determine: a. Water content b. Void ratio c. Moist unit weight d. Dry unit weight f. Effective unit weight

Q# 2. The following are the results of a consolidation test on a sample of a clayey soil Pressure, o' (kN/m²) 1.116 25 1.108 50 1.055 100 0.962 200 0.845 400 0.755 800 0.65 1600 0.658 800 0.675 400 0.685 200 a Plot the e, log o' curve. b. Using Casagrande's method, determine the pretonsolidation pressure. Calculate the compression index, C, and the ratio of C/C. C. (Note: Use excel for calculation and drawing. Discuss the details in your own words.)