The 20th and 21st joint COTA International Conference of Transportation Professionals (CICTP 2020-21)

In order to improve the heavy-traffic asphalt pavements performance, high modulus asphalt concrete (HMAC) was designed and evaluated. During the design of HMAC, the key sieve of 0.075mm, 2.36mm, 4.75mm and 9.5mm was controlled in gradation design. And in the asphalt-aggregates determination, the abundance coefficient (K) was employed. Subsequently, the HMAC with three gradations, numbering 1#, 2# and 3# HMAC-20, was designed and further evaluated by laboratory tests, including wheel tracking test, three-point bending test, immersion Marshall test and freeze-thaw splitting test. Analyzed results show that HMAC with gradation of 2# HMAC-20 is associated with a higher effectiveness, especially in high-temperature stability, low-temperature performance, and fatigue performance. It indicates that the dense-grade asphalt pavement with harden asphalt provides higher modulus. Moreover, the moisture proof is necessary to improve the moisture susceptibility.

CICTP