You are asked to design a flexible pavement structure for a new two-lane, two-wa

Question

You are asked to design a flexible pavement structure for a new two-lane, two-way highway. The following information and design requirements are made available to you: The pavement should last for 15 years with a minimum PSI of 2.5 at a probability of 70% or higher. The initial PSI is 4.5 and overall standard deviation is 0.40. Several in-situ modulus tests show that the subgrade has an effective soil resilient modulus of 4000psi The traffic on this highway is composed entirely of trucks with a daily volume of 120 trucks per lane for the first year. The predicted traffic growth rate is 5.0%. Each truck has one 18-kip single axle and one 30 kip tandem axle. The paving materials that are economically available for this highway includes hot-mix asphalt concrete, soil-cement and crushed stone. ASSHTO pavement design method was designated as the official design method. thickness of each layer.

Explanation / Answer

We select first alternative types of pavement because these pavements are use alternate then chance to repairing of more for pavement in a strong way

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