Repeat Problem 19-7 using two different depths of untreated aggregate bases of 6” and 12”. Highway contractors in your area can furnish rates for providing and properly laying an asphalt concrete surface and untreated granular base. Assume a structural coefficient of 0.12 for the base course. If these rates are available, determine the cost for constructing the different pavement designs if the highway section is 5 miles long and the lane width is 12 ft. Which design will you select for construction?
What will be an ideal response?
From Problem 19-7, SN = 3.4. Since the only change from Problem 19-7 is that a
base course of 6 or 12 inches is added, the same SN value can be used in this
problem.
Since this pavement is being designed with two layers, Equation 19.6 can be
modified for use in this problem as:
SN = a1D1 + a2D2m2
3.4 = (0.40)D1 + (0.12)D2(1)
For the 6 inch base course:
3.4 = (0.40)D1 + (0.12)(6)(1)
D1 = 6.7 inches.
For the 12 inch base course:
3.4 = (0.40)D1 + (0.12)(12)(1)
D1 = 4.9 inches.
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