A highway has the following pavement design
daily traffic: 300 single axles at 10,000 lb each, 120
single axles at 18,000 lb each, 100 single axles at
23,000 lb each, 100 tandem axles at 32,000 lb each,
30 single axles at 32,000 lb each, and 100 triple axles
at 40,000 lb each. A flexible pavement is designed to
have 4 inches of sand-mix asphalt wearing surface, 6
inches of soil-cement base, and 7 inches of crushed
stone subbase. The pavement has a 10-year design
life, a reliability of 85%, an overall standard
deviation of 0.30, drainage coefficients of 1.0, an
initial PSI of 4.7, and a TSI of 2.5. What is the
minimum acceptable soil resilient modulus?