A flexible pavement is constructed with 3 inches of hot-mix asphalt (HMA) wearing surface, 6 inches of emulsion/aggregate-bituminous base, and 6 inches of crushed stone subbase. The subgrade has a soil resilient modulus of 8,000 lb/in2 , and M2 and M3 are equal to 1.0 for the materials in the pavement structure. The overall standard deviation is 0.5, the initial PSI is 4.5, and the TSI is 2.5. The daily traffic has 1080 20-kip single axles, 400 24-kip single axles, and 680 40-kip tandem axles. How many years would you estimate this pavement would last (how long before its PSI drops below a TSI of 2.5) if you wanted to be 90% confident that your estimate was not too high, and if you wanted to be 99% confident that your estimate was not too high?
A flexible pavement is constructed with 3 inches of hot-mix asphalt (HMA) wearing
surface, 6 inches of emulsion/aggregate-bituminous base, and 6 inches of crushed
stone subbase. The subgrade has a soil resilient modulus of 8,000 lb/in2 , and M2 and
M3 are equal to 1.0 for the materials in the pavement structure. The overall standard
deviation is 0.5, the initial PSI is 4.5, and the TSI is 2.5. The daily traffic has 1080 20-kip
single axles, 400 24-kip single axles, and 680 40-kip tandem axles. How many years
would you estimate this pavement would last (how long before its PSI drops below a
TSI of 2.5) if you wanted to be 90% confident that your estimate was not too high,
and if you wanted to be 99% confident that your estimate was not too high?
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