The latitude at the location where a high-speed rural road is to be constructed is 35°. The expected ESAL is 32 × 106. The seven-day average high temperature is 53°C, and the low air temperature is -18°C. If the standard deviations for the high and low temperatures are ±2°C and ±1?C respectively, and the depth of the pavement is 155 mm, determine an appropriate asphalt binder for a reliability of 98%.
What will be an ideal response?
Use Equation 18.14 to determine the high pavement temperature at a depth of 20
mm,
T20mm = (Tair – 0.00618 Lat2 + 0.2289Lat + 42.2)(0.9545) – 17.78
Note: for Tair, with a reliability of 98%, use 53 + (2)(2) = 57
T20mm = (57 – 0.00618(35)2 + 0.2289(35) + 42.2)(0.9545) – 17.78
T20mm = 77.33°C
From Table 18.12, preliminarily select PG 88-22 as the binder. With ESAL >
10 × 106, increase temperature grade of binder by one. Therefore, select PG 64-22
as the appropriate binder.
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Fill in the blank(s) with the appropriate word(s).
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