Question 21 Calculate the design thickness in mm (rounded to the nearest tens) at the center of a rigid pavement with dowels if the: Allowable tensile strength of concrete — 3.0 МPа Wheel load = 117 kN %3D

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

Which of the following is generally not affected by water intrusion in pavement? a. Pore pressure buildup due to traffic b. Damage due to freeze-thaw cycles c. Transverse cracking d. Heaving in problematic subgrades e. Pumping of fines

What is the primary component of a bituminous pavement?   A) Cement B) Lime C) Bitumen D) Gypsum