A flexible pavement is constructed with 4 in. (10.16 cm) of hot mix asphalt wearing surface, 8 in. (20.32 cm) of emulsion/aggregate-bituminous base, and 8 in. (20.32 cm) of crushed stone subbase. The subgrade has a soil resilient modulus of 10,000 psi (68.95 MPa), 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 (89.0-kN) single axles, 400 24-kip (106.8-kN) single axles, and 680 40-kip (177.9-kN) tandem axles. How many years would you estimate this pavement would last (i.e., how long before its PSI drops below a TSI of 2.5) if you wanted to be 99% confident that your estimate was not too high, and if you wanted to be 95% confident that your estimate was not too high?
A flexible pavement is constructed with 4 in. (10.16 cm) of hot mix asphalt wearing surface, 8 in. (20.32 cm) of emulsion/aggregate-bituminous base, and 8 in. (20.32 cm) of crushed stone subbase. The subgrade has a soil resilient modulus of 10,000 psi (68.95 MPa), 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 (89.0-kN) single axles, 400 24-kip (106.8-kN) single axles, and 680 40-kip (177.9-kN) tandem axles. How many years would you estimate this pavement would last (i.e., how long before its PSI drops below a TSI of 2.5) if you wanted to be 99% confident that your estimate was not too high, and if you wanted to be 95% confident that your estimate was not too high?
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
