The spacing between the contraction joints of a CC pavement is 3.5 m. Determine the stress developed in the pavement (in kg/cm²) due to contraction if the coefficient of friction between the bottom of the pavement and the supporting layer is 1.05 and the unit weight of concrete is 2450 kg/m³.

Replace the 5 forces acting on the next pavement with a single force and position it so as to obtain a equivalent system.

The following figure shows concrete pavement with the layer thickness and elastic modulus as indicated. Assume modulus of rupture of 650 psi, load transfer coefficient of 3.2, serviceability loss from 4.5 to 2.5, and drainage coefficient of 0.9. The bedrock depth and loss of support is not considered for the subgrade. Use the design equation or monograph with 50% reliability to solve the following: 1) Determine the number of ESAL that the pavement can carry before failure. 2) If the daily traffic has 1080 single axles (20-kip), 400 single axles (24-kip), and 680 tandem axles (40-kip), and the annul traffic is the same over the design period, how many years would the concrete pavement last before failure? 8-inch Portland Cement Concrete Ec=4×106 psi 8-inch Granular Subbase Ec=30,000 psi Subgrade Mr = 5000 psi

27. The PCA design methodology for airfield rigid pavements is based on the interior bending stress at the bottom of the slab.a. Trueb. False