Question

question one and question help please

1. A 8.5-in. concrete slab is placed directly on a subgrade. The relationship between the resilient modulus and k value is indicated by the following equation: MR 19.4 The monthly subgrade resilient moduli from January to December are 15,900, 27,300, 38,700, 50,000, 900, 1620. 2340, 3060, 3780, 4500, 4500, and 4500 psi. Determine the effective modulus of subgrade reaction. is shown below. The co psi, a load transfer coefficient of 3.2, a serviceability loss from 4.5 to 2.0, and poor drainage with 5% of time near saturation. Determine the performance traffic without the reliability term and check the result by the AASHTO design chart. (Tips: this concrete has a granular base and you would need to determine composite modulus of subgrade reaction first) Concrete E 4x10 psi Granular subbase Esn 30,000 psi 8 in. 8 in. Subgrade, MR 5000 psi

Answer 1

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