Evaluation of Engineering Properties of Rock-Modified Sand–Asphalt Concrete

Autor: Der-Hsien Shen, Hung-Ta Hsu, Shu-Chia Chang, Ming-Feng Kuo
Rok vydání: 2021
Předmět:
Zdroj: International Journal of Pavement Research and Technology. 15:1227-1238
ISSN: 1997-1400
1996-6814
DOI: 10.1007/s42947-021-00084-4
Popis: Buton rock asphalt (BRA) is used as a modifier in road applications to enhance the performance of asphalt pavement mixtures. Rock-modified sand–asphalt (RMSA) concrete can be prepared by adding BRA to sand–asphalt (SA) concrete. In this study, BRA was added to SA concrete through wet and dry modification processes. In the dry modification process, BRA was directly added to SA concrete. In the wet modification process, pure rock asphalt (PRA) extracted from BRA was preblended with the base asphalt of SA concrete. We evaluated the engineering properties of RMSA concrete through comprehensive laboratory tests. The comparison and control groups comprised RMSA concrete and polymer-modified sand–asphalt (PMSA) concrete. The test results indicated that the Marshall stability and indirect tensile strength of RMSA were higher than those of the unmodified sand–asphalt (USA) concrete and PMSA concrete. Regarding durability, the index of retained strength (IRS) and tensile strength ratio (TSR) of RMSA were higher than those of PMSA. Thus, adding BRA to SA concrete can improve its moisture damage resistance and durability. The dynamic stability (DS) of RMSA was higher than that of USA concrete and close to that of PMSA. Overall, BRA was found to be suitable for use in conjunction with SA concrete. We recommended that the PRA content should not exceed 15% by weight of the rock-modified asphalt binder. The addition of BRA improved the mechanical properties, moisture damage resistance, permanent deformation resistance, and high-temperature performance of RMSA. The feasibility of BRA addition to SA concrete was validated.
Databáze: OpenAIRE
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