assign4-12

assign4-12 - 2 , load transfer coefficient of 3.0 and...

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Purdue University School of Civil Engineering CE 361 – TRANSPORTATION ENGINEERING Assignment 4 4.14 (Answer: 56.5%) 4.27 (Answer: 10.18 in.) 4.35. (Answer: 4.31) 4.X1. A flexible pavement is designed to last 10 years to withstand truck traffic that consists only of trucks with two 18-kip single axles. The pavement is designed for a soil CBR of 2, an initial PSI of 5.0, a TSI of 2.5, an overall standard deviation of 0.40 and a reliability of 90%, and the structural number was determined to be 6. On one section of this roadway, beneath an underpass, an engineer uses an 10-inch rigid pavement in an attempt to have it last longer before resurfacing. How many years will this rigid- pavement section last? (Given the same traffic conditions, modulus of rupture = 800 lb/in 2 , modulus of elasticity = 5,000,000 lb/in
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Unformatted text preview: 2 , load transfer coefficient of 3.0 and drainage coefficient of 1.0). (Answer: 17.14 years) 4.X2. A rigid pavement on a new interstate (3 lanes each direction) has been conservatively designed with a 12-inch slab, an E c of 5.5 10 6 lb/in 2 , a concrete modulus of rupture of 700 lb/in 2 , a load transfer coefficient of 3.0, an initial present serviceability index of 4.5, and a terminal serviceability index of 2.5. The overall standard deviation is 0.35, the subgrade CBR is 25, and the drainage coefficient is 0.9. The pavement was designed for six hundred 30-kip tandem axles per day and fourteen hundred 20-kip single axle loads per day. If the desired reliability was 90%, how long was this pavement designed to last? (Answer: 46 years)...
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