为了研究高温裂解对胶粉改性沥青低温性能的影响,在不同加工温度和加工时间下分别制备9组高温裂解胶粉改性沥青,并以不同改性沥青样品在甲苯中的溶解度表征胶粉的裂解程度。通过比较各样品的5℃延度值、经差示扫描量热法(DSC)测试得到的玻璃化转变温度Tg以及低温弯曲梁流变(BBR)试验在-24℃的蠕变劲度模量S,考察了加工温度和加工时间对胶粉改性沥青低温性能的影响规律。研究结果表明:当胶粉掺量(质量分数)为30%时,在230℃及250℃下加工样品的溶解度随加工时间的延长有逐渐增大的趋势;在270℃下加工样品时,由于轻质组分受热剧烈挥发,导致样品的溶解度随时间的延长呈现先增大后减小的趋势;在230℃下,高温裂解胶粉改性沥青样品的低温性能随着加工时间的延长先提高后降低;在250℃及270℃下,随着加工时间的延长,高温裂解胶粉改性沥青样品的低温性能逐渐降低;与传统橡胶沥青加工工艺相比,在一定的加工时间范围内,胶粉的高温脱硫裂解有利于进一步提高胶粉改性沥青的低温性能;9组高温裂解胶粉改性沥青样品中,250℃下加热搅拌1 h的样品低温性能最好,其次为230℃下加热搅拌2 h的样品。 In order to study the effect of pyrolysis on the low temperature performance of rubber powder modified asphalt, 9 groups of pyrolysis rubber were prepared at different processing temperature and processing time respectively. The modified asphalt samples were characterized by their solubility in toluene The degree of cracking. The creep stiffness modulus at -24 ° C was tested by comparing the 5 ° C ductility value of each sample, the glass transition temperature Tg as measured by differential scanning calorimetry (DSC) and the low temperature flexural beam (BBR) test S, investigated the processing temperature and processing time on the rubber powder modified asphalt low temperature performance of the law. The results show that the solubility of samples processed at 230 ℃ and 250 ℃ tends to increase with the increase of processing time when the content of powder (mass fraction) is 30%. When samples are processed at 270 ℃, The light components heated violently volatilized, resulting in the solubility of the sample first increased and then decreased with the extension of time; at 230 ℃, the low temperature performance of modified asphalt samples pyrolyzed at high temperature with the processing time first increased And then decreased. With the increase of processing time at 250 ℃ and 270 ℃, the low temperature performance of modified asphalt samples with pyrolysis rubber powder decreased gradually. Compared with the traditional rubber asphalt processing technology, in a certain processing time, The high-temperature desulfurization and pyrolysis of the powder is conducive to further improve the low temperature performance of the crumb rubber modified asphalt. In the 9 samples of modified asphalt with high temperature cracked crumb rubber, the sample heated at 250 ℃ for 1 h has the best low temperature performance, followed by the heating at 230 ℃ Stir the sample for 2 h.