acela om Question 2.129 marks) 1. A All material being proposed for use as a subbase for a highway project has passed 64% through No 10 sieve (2.00mm) 33% through No 40 sleve (0.425mm) and 10% through No 200 sieve (0.075mm).It is also given the liquid limit 37 and the plastic limit 28. The material does not appear to be organio. Classify the material using AASHTO and rate its suitability for subgrade material (8 marks). Data of a falling head test is given below: Measurement Description Value Length of the soil sample 150 mm Area of the soil sample Area of the standpipe 25 mm? At time to head difference 400 mm At time t=8 minutes, head difference 200 mm 1964 mm Using the data above, a) determine the hydraulic conductivity of the soil (cm/sec) (4 marks) b) What was the head difference at t= 6 minutes? (4 marks) III. As a building practitioner, a) define permeability of soil and how this feature is essential in design and construction of buildings and infrastructure? (4 marks) b) discuss the factors affecting permeability- your discussion should clearly identify the permeability change depending on the variation of factors (9 marks) Question 4.(24 marks) The wet mass of one of the standard Proctor test samples is 2009g at a water content of 16.44%. The volume of the standard Proctor test sample is 944 cm a) Determine the bulk unit weight. (3 marks) b) Determine the dry unit weight. (3 marks) Discuss how Modified Proctor Compaction Test varies from Standard Proctor Compaction Test. (4 marks) Assume you were assigned to demonstrate the Proctor Compaction Test in a laboratory. How would you explain the audience about the Proctor Compaction Test to determine the maximum dry unit weight of soils? (you may utilize illustrations, sketches and/or photos in your answer) (8 marks) II. III. Page 3 of 5 acela om Question 2.129 marks) 1. A All material being proposed for use as a subbase for a highway project has passed 64% through No 10 sieve (2.00mm) 33% through No 40 sleve (0.425mm) and 10% through No 200 sieve (0.075mm).It is also given the liquid limit 37 and the plastic limit 28. The material does not appear to be organio. Classify the material using AASHTO and rate its suitability for subgrade material (8 marks). Data of a falling head test is given below: Measurement Description Value Length of the soil sample 150 mm Area of the soil sample Area of the standpipe 25 mm? At time to head difference 400 mm At time t=8 minutes, head difference 200 mm 1964 mm Using the data above, a) determine the hydraulic conductivity of the soil (cm/sec) (4 marks) b) What was the head difference at t= 6 minutes? (4 marks) III. As a building practitioner, a) define permeability of soil and how this feature is essential in design and construction of buildings and infrastructure? (4 marks) b) discuss the factors affecting permeability- your discussion should clearly identify the permeability change depending on the variation of factors (9 marks) Question 4.(24 marks) The wet mass of one of the standard Proctor test samples is 2009g at a water content of 16.44%. The volume of the standard Proctor test sample is 944 cm a) Determine the bulk unit weight. (3 marks) b) Determine the dry unit weight. (3 marks) Discuss how Modified Proctor Compaction Test varies from Standard Proctor Compaction Test. (4 marks) Assume you were assigned to demonstrate the Proctor Compaction Test in a laboratory. How would you explain the audience about the Proctor Compaction Test to determine the maximum dry unit weight of soils? (you may utilize illustrations, sketches and/or photos in your answer) (8 marks) II. III. Page 3 of 5