Abstract
Super hard asphalt (SHA) as a black and solid material at ambient temperature is a byproduct of direct coal liquefaction process, which mainly generates clean liquid fuels from coal and is one of the clean-coal technologies. Firstly this paper introduced how the SHA is produced, its physical properties, chemical compositions, as well as its influence to the environment. Then, the opportunities and challenges of using SHA as pavement material were discussed, including three challenges and three corresponding technologies. Lastly, the progresses for SHA based asphalts were illustrated, in which two asphalt modifiers (SHA-N and SHA-S) were produced from SHA using in-situ micro crosslink technology. Then two SHA-based modified asphalts were manufactured at an industrial scale. The performance grades were classified as PG 82–22, which present excellent high and low temperature performance. Thereafter one 1.2 km test road was paved by the road pavement asphalt using the SHA-N-based modified asphalt under AC-13C gradation as the top layer of G110 national highway in Yinchuan. The other 0.9 km test road was paved using the SHA-S modified asphalt under AC-20 gradation in the middle layer of G69 expressway in Chongqing. The field data shows that the performance of asphalt mixtures and pavements after paving is excellent. The long-term performance of the test roads will be followed.
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