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 12inch 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 30kip tandem axles per day and fourteen hundred 20kip 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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 Spring '09
 Transportation Engineering, Road, Truck, overall standard deviation

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