Determine the effective modulus of a subgrade reaction for a rigid pavement that has the following conditions: 8 in. unbound granular subbase of subgrad Bedrock located at 5 ft from the bottom of subgrade Estimated thickness of concrete slab about 10 in. Answer: The resilient modulus of roadbed soil and subbase at different months of a year is listed in the table. Roadbed soil modulus (psi) Subbase modulus, E (psi) 18,000 18,000 18,000 15,000 16,000 16,000 16,000 16,000 15,000 15,000 15,000 18,000 Month January February March April May June July August September October November December 8,000 9,000 9,000 4,000 5,000 5,000 7,000 7,000 4,000 4,000 4,000 8,000 F

Determine the effective modulus of a subgrade reaction for a rigid pavement that has the following conditions: - 8 in. unbound granular subbase - Bedrock located at 5ft from the bottom of subgrade - Estimated thickness of concrete slab about 10 in. - The resilient modulus of roadbed soil and subbase at different months of a vear is listed in the table. Answer: Determine the effective modulus of a subgrade reaction for a rigid pavement that has the following conditions: - 8 in. unbound granular subbase - Bedrock located at 5ft from the bottom of subgrade - Estimated thickness of concrete slab about 10 in. - The resilient modulus of roadbed soil and subbase at different months of a vear is listed in the table