A roadway is to be designed to carry traffic loading with an AADT of 5000 during

Question

A roadway is to be designed to carry traffic loading with an AADT of 5000 during the first year of operation with expected annual growth rate of 6% and a 25 year design life. The traffic mix which is expected to remain unchanged throughout the design period, consists of 60% passenger cars; 20% 2-axle, 4 tire single unit trucks; 10% 2-axle, 6 tire, single unit trucks; 5% 3-axle, single unit trucks; 3% 3-axle tractor trailers; 2% 4-axle tractor trailers. If the sub-grade has resilient modulus of 15,000psi and the mean air temperature is 60 deg C, design three alternative pavement schemes as follows: i) Scheme I: An asphalt concrete surface over either a Type I emulsified asphalt base or a Type II emulsified asphalt base. ii) Scheme II: An asphalt concrete surface over an untreated 8 - inch granular base. iii) Scheme III: Same as Scheme II with part of the HMA surface replaced by a Type II emulsified base to provide a 3-layer pavement. Compare the resulting pavement schemes in terms of their expected performance, ease of construction and cost. Which of these three scheme would you recommend and why?

Explanation / Answer

The road way to be designed is to carry traffic loading with an AADT of 5k during the 1st yr of operation with expected annual growth rate of 6% and a twenty five yrs life.The

scheme 2 is recommended.

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