Question

The traffic on the design lane of a proposed four-lane rural Interstate highway consists of 40% trucks. Studies have shown that the truck factor can be taken as 0.45. Design a suitable flexible pavement using the 1993 AASHTO method if the ADTT during the first year of operation is 1200. PSIni-4.2 and PSIterminal-2.0. The growth rate is 5%, the design life is 20 years, the reliability level is 95% and the standard deviation is 0.45. Moisture levels approach saturation 20% of the time and it takes approximately 1 week for drainage of water. CBR of the subgrade material is 5. CBR of the base and subbase are 70 and 22 respectively. MR for the asphalt concrete is 450,000 psi.

Could you please answer this question manually without using any software?

Answer 1

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