CVE $5061$ Pavement Design

Homework Problems

Due:

$($PART I: $50$ points$)$ Use the AASHTO Elexible pavement design procedure to design a four$-$lane

pavement for a $25-$year design period, with the following information:

Layer $1$ HMAC Resilient Modulus $400,000$ psi, Poisson's Ratio $0\mathrm{.}25$

Layer $2$ Base Rock Resilient Modulus $40,000$ psi, Poisson's Ratio $0\mathrm{.}35$

Layer $3$ Subbase Gravel Resilient Modulus $25,000$ psi Poisson's Ratio $0\mathrm{.}40$

Subgrade Sand Resilient Modulus $5500$ psi Poisson's Ratio $0\mathrm{.}40$

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 $=1\mathrm{.}5\%$ 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 $50$ points$)$ Use the AASHTO Flexible pavement design equation on page $360$ of your

book $($Equation $12\mathrm{.}3)$ to solve for the pavement thicknesses above.

You can program your solution using Excel or MathCAD or Matlab or you can complete the

assignment by hand neatly on engineering paper.

Note you should choose the standard normal deviate $(Zr)$ in Table $12\mathrm{.}3$ based on the inputted

statistical reliability.

Sketch your pavement cross section and include the thickness per layer and pertinent material

properties.

$($PART III $25$ points$)$ 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.