Civil Engineering homework help. (PART I: ) Use the AASHTO Flexible pavement design procedure to design a four-lane pavement for a 15-year design period, with the following information:
 
Layer 1 HMAC Modulus 500,000 psi Poisson’s Ratio 0.35
Layer 2 Base Rock Modulus 45,000 psi Poisson’s Ratio 0.35
Layer 3 Subbase Gravel Modulus 35,000 psi Poisson’s Ratio 0.40
Subgrade Sand Modulus 5500 psi Poisson’s Ratio 0.40
 
Traffic: Initial two-way annual average daily truck traffic (AADTT) = 345
Percent of Trucks in Design Direction= 50
Percent of Trucks in Design Lane = 95
Traffic Growth Rate = 4 % per year
All Trucks are 18 Kip Tandem Axles
 
Sketch your pavement cross section and include the thickness per layer and pertinent material properties.
 
 
(PART II ) Use the AASHTO Flexible pavement design equation on page 360 of your book to solve for the pavement thicknesses above.
 
You can program you solution in Excel or MathCAD or Matlab
 
Note you should also allow the standard normal deviate (Zr) to be chosen based on the inputted statistical reliability.
 
Sketch your pavement cross section and include the thickness per layer and pertinent material properties.
 
 
(PART III ) Given the previous information determine the thickness of the asphalt using the Asphalt Institute approach.
 
Sketch your pavement cross section and include the thickness per layer and pertinent material properties.
 

Civil Engineering homework help