2. Calculate the Effective Modulus of Subgrade Reaction (k) per Table 3.2 of the

Question

2. Calculate the Effective Modulus of Subgrade Reaction (k) per Table 3.2 of the 1993 AASHTO Rigid Pavement Design Guide for the pavement configuration given in Figure 1 and for the seasonal subgrade soil data given in Table 1. You must make appropriate corrections for depth to bedrock and loss of support (Use LOS = 1.0). Use a Subbase resilient modulus of 75 ksi and assume that there is no seasonal variation of subbase strength. Eigure 1 8" thick Concrete Slab 6" thick Cement Treated Base 10 feet thick subgrade Bedrock Table 1. Seasonal variation of subgrade resilient modulus No. Seasonal Period 1 December - February 2March- April 3May - November Subgrade Resilient Modulus (ksi) 20 7.2 12

Explanation / Answer

Modulus of subgrade reaction(K)=load(In Kg)÷penetration(In cm)

And use this formula and get the effective subgrade of reaction

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