不同外掺材料对沥青低温性能的影响研究

Study on the Effect of Different Admixtures on the Low Temperature Properties of Asphalt

为了评价不同外掺材料对沥青低温性能的影响,本研究使用Sasobit、再生沥青瓦(RAS)、再生沥青(RAP)、生物油制备出四种改性沥青。通过开展小梁弯曲蠕变劲度试验(BBR)和新型沥青结合料裂缝测量试验(ABCD)对四种改性沥青的低温性能进行评价。试验结果表明:Sasobit掺量超过一定的比例会导致沥青低温性能降低,生物沥青有效提高了沥青的低温性能。与基质沥青相比,生物油掺量为10%的生物沥青开裂温度降低了4.6℃~6.7℃。通过两种试验对比四种改性沥青低温性能及其改性剂掺量的变化而变化的规律,得出用生物油提高沥青低温性能的可行性。

In order to evaluate the impact of different admixtures on the low-temperature performance of asphalt,four types of modified asphalt were prepared using Sasobit,recycled asphalt shingles(RAS),recycled asphalt(RAP),and bio-oil in this study.The low-temperature performance of four modified asphalts was evaluated by conducting a beam bending creep stiffness test(BBR)and a new asphalt binder crack measurement test(ABCD).The test results show that the addition of Sasobit in excess of a certain proportion will lead to a decrease in the low-temperature performance of asphalt.The bioasphalt effectively improves the low-temperature performance of asphalt.Compared with neat asphalt,the cracking temperature of bio-asphalt with 10%bio-oil content decreased by 4.6℃to 6.7℃.Through two experiments to compare the low-temperature performance of four types of modified asphalt and the changing rules of the amount of modifier,the feasibility of using bio-oil to improve the lowtemperature performance of asphalt is obtained.