摘要
制备聚氨酯(掺量为5%、8%、11%)与橡胶粉复合的改性沥青试件,开展车辙试验、高温拉伸与压缩试验、高温老化性能试验,研究聚氨酯和橡胶粉复合改性沥青材料抗高温变形性能。结果表明:65℃环境下,聚氨酯和橡胶粉复合改性沥青稳定度较基质沥青稳定度高,且高温环境下稳定性较强;聚氨酯掺量为8%的复合改性沥青,在相同荷载下的压缩位移最小,在高温环境下的抗压缩能力更强,在高温环境下的软化点较高,针入度和延度较低,高温抗变形性能更优,能够提升沥青路面的高温稳定性,延长其使用寿命。因此聚氨酯掺量为8%的复合改性沥青可以作为抗高温变形材料进行路面应用。
Based on the prepared polyurethane(dosage:5%,8%,11%)and crumb rubber composite modified asphalt specimens,rutting tests,high-temperature tensile and compressive strain tests,and high-temperature aging tests were conducted to study the high-temperature deformation resistance of the polyurethane and crumb rubber composite modified asphalt material.The results show that under 65 C environment,the stability of polyurethane and rubber powder composite modified asphalt is higher than that of matrix asphalt,and the stability is stronger under high temperature environment;The composite modified asphalt with a polyurethane content of 8%has the smallest compression displacement under the same load,stronger compression resistance under high temperature environment,higher softening point under high temperature environment,lower penetration and elongation,and better high-temperature deformation resistance.It can improve the high-temperature stability of asphalt pavement and extend its service life.Therefore,composite modified asphalt with a polyurethane content of 8%can be used as a high-temperature deformation resistant material for road applications.
作者
沈建青
容七英
SHEN Jianqing;RONG Qiying(Qinghai Provincial Transportation Construction Management Co.,Ltd.,Xi'ning 810000,China;Jiangxi Longzheng Technology Development Co.,Ltd.,Ganzhou 341000,China)
出处
《粉煤灰综合利用》
2025年第5期38-42,共5页
Fly Ash Comprehensive Utilization
关键词
聚氨酯
橡胶粉
复合改性沥青
高温
抗变形性能
polyurethane
rubber powder
composite modified asphalt
high temperature
anti deformation performance
