You are asked to design a flexible pavement structure for a

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.

Solution

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