WSDOT wants to build a highway near to the Spokane International Airport. The cl
ID: 802376 • Letter: W
Question
WSDOT wants to build a highway near to the Spokane International Airport. The climate data is shown in the following table. Calculate the pavement high temperature at the depth of 20mm below the surface and the pavement low temperature at the surface with the reliability of 98%. Determine the appropriate performance grade (PG) of asphalt binder that can be used for this highway with speed limit of 60 mph and reliability of 98%. (Do not need to consider Traffic Amount effects in this problem) If a parking lot is built as well with asphalt mixtures at the Spokane International Airport, determine the appropriate performance grade (PG) of asphalt binder that can be used. (Do not need to consider Traffic Amount effects in this problem).Explanation / Answer
Answer: a
The temperature at surface can be calculated as follows;
Tsurface= T (mean air)+ T(standard deviation)
Tsurface= -16.5 o C
Temperature at depth(20mm) can be calculated as follows:
Tdepth= 0.95+0.892* Tsurface +[ log (20)- 1.25] [ -0.48* Tsurface+ 0.621* Tmean air high +1.83*Sin (2.5)] [ 0.042 * Tsurface * Sin (2.5)]
By putting values in above equation we get,
Tdepth= -12.36 o C
Answer:b
The PG 58-22 should be use for the given condition.
Answer :c
The PG 76-22 should be use for the given condition.
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