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The four chemical components of asphalt are asphaltene, aromatic, , and .

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Someone wants to test the high temperature grade of an asphalt binder, the DSR experiment was conducted and the results were shown as below. Could you help determine the high temperature grade of the asphalt binder?Tests52゜C58゜C64゜C70゜CG* (kPa)δ(°)G* (kPa)δ(°)G* (kPa)δ(°)G* (kPa)δ(°)Original asphalt DSR1.23821.10851.02870.8589RTFO aged DSR2.60782.35802.21851.8087

A. 52℃
B. 58℃
C. 64℃
D. 70℃

The softening point and ductility values of aged asphalt binder will and comparing with unaged asphalt binder, respectively.

HMA is the abbreviation of______ .

For an aggregate sample, the moist mass is 500g and the bone-dry mass is 480g, what is its water content?

A. 4.0%
B. 4.2%
C. 2.0%
D. 2.2%