Answer Happy

Question 1 (7 marks) The figure below shows the results from a standard Proctor compaction test on a soil sample taken from an earthworks project. 2.00 1.95 = 100% 1.90 1.85 Pa (g/cm3) 1.80 1.75 1.70 10.00 12.00 14.00 16.00 18.00 20.00 w (%) 1.1 From the figure, determine the maximum dry density and optimum water content. (2 marks) 1.2 At optimum water content, calculate the void ratio (e) and degree of saturation (S) if the specific gravity of soil grains (Gs) is 2.66. (2 marks) 1.3 Give a brief explanation (less than 50 words) on the 'S = 100%' curve in the figure. (1 mark) 1.4 Give a brief comment (less than 50 words) on the moisture content range that the contractor should work and compact this material. (1 mark) 1.5 What dry density does the contractor need to achieve in the field if the Project Specification requires 95% density ratio? (1 mark)