Question

Question 1 (20 points) A standard Proctor test was performed on a soil which has a Gs = 2.70. The moisture content and total density results are shown in the table below. Moisture Content 16% Wet unit weight (KN/m3) 19.1 18% 20.3 20% 20.7 22% 20.0 24% 18.2 a. Calculate the dry unit weight for each sample and type your answers in the first 5 answer boxes below (3 sigs, in KN/m3). b. Calculate the dry unit weight at zero air void for the 22% and 24% moisture content samples and type those answers in boxes 6 and 7 below(3 sigs, in KN/m3). . c. Plot the moisture content-dry unit weight curve and zero air void line on graph paper. d. From the moisture content-dry density curve, determine the maximum dry unit weight(3 sigs, in KN/m3). and optimum moisture content (3 sigs, in %). for this soil and type those answers in boxes 8 and 9 below. e. Submit a single PDF showing the moisture content-dry unit weight curve and your calculation from above to D2L.

Answer 1

Moisture Content	Wet Unit Weight	Dry Unit Weight	Dry Unit Weight at Zero Air Void
16	19.1	16.47	18.50
18	20.3	17.20	17.82
20	20.7	17.25	17.20
22	20	16.39	16.62
24	18.2	14.68	16.07

24.00 21.00 MDD = 17.28KN/m3 18.00 15.00 Dry Unit Weight (kN/m3) 12.00 9.00 6.00 3.00 OMC = 20.2% 0.00 0 5 10 15 20 25 30 Moisture Content % Dry Unit Weight - -Dry Unit Weight at Zero Air Void

Initially we calculate the Dry unit weight and Dry weight for Zero Air Void. Then we plot the graph for the obtained calculated values. The formulas used are given below

Dry Unit Weight = Wet Unit Weight / (1 + Moisture content in percent divided by 100)

7 1 w+ G