A flexible pavement was designed for the following daily traffic with a 12- year design life: 1300 single axles at 8,000 lb each, 900 tandem axles at 15,000 lb each, 20 single axles at 40,000 lb each, and 200 tandem axles at 40,000 lb each . The highway was designed with 4 inches of hot-mix asphalt (HMA) wearing surface, 4 inches of hot-mix asphalt base, and 8 inches of crushed stone subbase. The reliability was 70%, overall standard deviation was 0.5, APSI was 2.0 (with a TSI of 2.5), and all drainage coefficients were 1.0. Using the AASHTO flexible pavement design procedure and equation to determine the following: a) W18 (18 - kip equivalent single - axle load) value for the design years. b) What was the soil resilient module of the subgrade used in design?
A flexible pavement was designed for the following daily traffic with a 12- year design life: 1300 single axles at 8,000 lb each, 900 tandem axles at 15,000 lb each, 20 single axles at 40,000 lb each, and 200 tandem axles at 40,000 lb each . The highway was designed with 4 inches of hot-mix asphalt (HMA) wearing surface, 4 inches of hot-mix asphalt base, and 8 inches of crushed stone subbase. The reliability was 70%, overall standard deviation was 0.5, APSI was 2.0 (with a TSI of 2.5), and all drainage coefficients were 1.0. Using the AASHTO flexible pavement design procedure and equation to determine the following: a) W18 (18 - kip equivalent single - axle load) value for the design years. b) What was the soil resilient module of the subgrade used in design?
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