For the following temperature conditions, calculate the proper Superpave G grade

Question

For the following temperature conditions, calculate the proper Superpave G grade for both 50% and 98% reliability (show calculations) Seven day pavement high temperature of 46 degree C with a standard deviation of 2 degree C Minimum pavement temperature of 19 degree C with a standard deviation of 4 degree C The mixing temperature for asphalt and aggregate is: a. 430 - 460 degrees Fahrenheit b. 212 - 250 degrees Fahrenheit c. 250 - 325 degrees Fahrenheit d. 180 - 212 degrees Fahrenheit The designation MC-3000 is: a. for an asphalt concrete with a 3000 lb./sq. in. load capacity medium grade b. for an asphalt concrete rate of 3000 centimeters moderately cured c. for an asphalt cement with a medium curing rate and 3000 centistokes of viscosity d. none of the above

Explanation / Answer

answer to the 5th question.

250-325 degrees fahrenheit.

mixing and compaction temperature is analysed by using a viscosity versus temperature graph(ASTM D 2493) . The graph shows two measurements at 135degree celsius to 165degree celsius that establish a relationship between viscosity and temperature. Once the relationship is established, the compaction temperature and mixing temperature are found to be in the range of 140-145degree celsius and 152-158 degree celsius , respectively.

to convert degree celsius to degree fahrenheit, degree F= (1.8* degree C )+ 32.

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