QUESTION 5 [20 MARKSI A rigid pavement will be constructed with the input variables as shown in Table 1. Table 1: Input Variables for Construction of Rigid Pavement Daily truck traffic 80 single axles at 22,500 lb each 570 tandem axles at 25,000 lb each 50 tandem axles at 39,000 lb each 80 triple axles at 48,000 lb each Modulus of rupture 600 lb/in Modulus of elasticity 5 million lb/in Reliability Standard deviation 0.4 Drainage coefficient 0.9 APSI 1.7 (with a TSI of 2.5) Load transfer coefficient 3.2 Modulus of subgrade reaction 200 lb/in? Design life 95% 20 year As a pavement engineer, determine the required slab thickness in accordance with American Association of State Highway and Transportation Officials (AASHTO) design standard