Three sets of compaction data are given below. Assume that the density of solids is ps= 2.64 Mg/m', and answer and/or compute the following: a) Plot the compaction curves of each in Excel, along with the zero air voids (ZAV) curve.

Question 2 A soil has a water content of 25 %, a void ratio of 0.7, and a specific gravity of solids of 2.7. (a) On the phase diagram shown below, choose the total volume to be equal to one, and fill up all other quantities. Use Kg for mass and m3 for volume. Volume (m3) V1 Vy Vw Vs AIR WATER SOLIDS Phase Diagram Mass (Kg) Mw X Ms (b) Use the phase diagram to calculate the following quantities. (i) total density (ii) dry density (iii) degree of saturation (iv) saturated density (assume no volume change) M1

Given below is the result of a sieve analysis done on a soil sample. Sieve No. Diameter Percent Passing % 4 4.750 96 10 2.000 81 20 0.850 72 40 0.425 50 60 0.250 27 100 0.150 14 200 0.075 5 Pan --- 0 Determine the value of the coefficient of gradation/curvature.

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.)

2.8 2.7 The following are the results of a sieve and hydrometer analysis. Sieve number/ grain size Analysis Sieve Hydrometer Analysis Sieve 40 80 170 200 0.04 mm 0.02 mm 0.01 mm 0.005 mm 0.0015 mm Hydrometer Sieve number/ grain size Percent finer than a. Draw the grain-size distribution curve. b. Determine the percentages of gravel, sand, silt, and clay according to the MIT system. c. Repeat Part b according to the USDA system. d. Repeat Part b according to the AASHTO system. Repeat Problem 2.7 with the following data: 20 30 40 60 80 200 0.05 mm 0.03 mm 0.015 mm 0.006 mm 0.004 mm 0.0015 mm 100 96 85 80 59 39 26 15 8 Cengage Learning 2014 Percent finer than 100 96 90 76 65 34 27 19 11 7 6 5 C Cengage Learning 2014

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