Test on Road Performance of BRA Modified Asphalt and Mixture

摘要

Buton Rock Asphalt is a natural hard asphalt which is relatively rich in asphaltene and very low in wax. Through researches and practices, it is proved that the mixture of a certain amount of rock asphalt into the petroleum asphalt for regular roads can considerably improve the adhesivity of asphalt and aggregate and the high-temperature stability, low temperature crack resistance and water susceptibility. Relying on Guangdong Shantou To Jieyang Expressway, this paper applies Buton Rock Asphalt(hereinafter referred to as BRA) to making 70 Aiptek (hereinafter referred to as the IRPC-70) be modified, tests and analyzes the asphaltene content of the BRA and mineral levels and studies the influence of the BRA content on performance of modified asphalt. In the mixture design phase, it studies the impact of aggregate gradation after the BRA accession, obtaining the correction factor of the key sieve's pass rate. Finally, the BRA mix design and pavement performance has been studied by the test section.