MU Civil Engineering (Semester 7)
Pavement Subgrade and Materials
December 2016
Total marks: --
Total time: --
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1(a) Briefly explain the functions of Subgrade.
5 M
1(b) Draw the 3 phase diagram for different Bituminous mixture.
5 M
1(c) Classify the following soil as per PRA/HRB system
Soil A Soil B
Passing thro 0.075 mm-34% 86%
L.L=38% 70%
P.L=26% 32%
5 M
1(d) How the grading of aggregate will affect the performance of pavement?
5 M

2(a) Write short notes on side drains.
5 M
2(b) The specific gravities and weight proportions for gate and bitumen area as under for the preparation of Marshall mix design. The volume and weight of one Marshall specimen was found to be 475 cc and 1100 gm. Assuming absorption of bitumen in aggregate is zero, Findout Vv,
VMA and VFB;
Item A1 A2 A3 A4 B
Wt(gm) 825 1200 325 150 100
Sp.Gr 2.63 2.51 2.46 2.43 1.05
5 M

3(a) Enlist the test on Bitumen. Explain any one with specification.
10 M
3(b) Define the term soil stabilization. What are the broad categories of soil stabilization?
10 M

4(a) A longitudinal channel with trapezoidal cross section is to be constructed with a longitudinal slope of 1 in 2500. Type of soil is clay. The Mannings co-efficient id 0.024. The max allowable velocity is 0.6 m/s. Design the channel for a discharge of 3m3/sec.
10 M
4(b) Define compaction of soil. Briefly explain any one method soil compaction.
10 M

5(a) A clay 4m thick has a final settlement of 6cm. The layer has double drainage if the co eff of consolidation is 0.02cm2/min. Determine the time required for different % consolidation from 10% to 90%.
15 M
5(b) Write short note on Depth of frost penetration.
5 M

6(a) Expalin various defects of highways due to improper drainge system. Also state the essential requirements of good highway drainage system.
10 M
6(b) What are pumping station? Explain the design consideration of pumping station.
10 M

7(a) Calculate the % of passing filter material based on permeability ratio and piping ratio. Drain pipe with circular perforated hole is 10mm dia. The Subgrade soil gradation is given in table.
Sieve size(mm) % passing
1.18 95
0.425 85
0.300 60
0.150 50
0.075 14
0.053 05
10 M
7(b) Enlist explain the factors affecting gravitational water.
10 M

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