聚氨酯改性沥青及混合料应用研究

Research on the Application of Polyurethane Modified Asphalt and Mixture

摘要: 为了评价聚氨酯改性沥青的技术优势，对比评价了聚氨酯改性沥青与SBS沥青的技术指标，研究表明聚氨酯改性沥青的软化点、储存稳定性及老化后的性能指标均优于SBS沥青，但低温延度较差。基于车辙试验、弯曲蠕变试验、浸水马歇尔试验和冻融劈裂试验评价了两种沥青混合料的路用性能，研究表明聚氨酯改性沥青混合料能够在保证低温性能不发生衰减的情况下显著提升混合料的高温性能和水稳定性。进行了聚氨酯改性沥青混合料的工程应用，可降低混合料施工温度10℃~20℃，汉堡轮辙试验表明聚氨酯改性沥青混合料具有良好的抗车辙性能和抗水剥落能力，应用效果良好。

Abstract: In order to evaluate the technical advantages of polyurethane modified asphalt, a comparative evaluation was conducted on the technical indicators of polyurethane modified asphalt and SBS asphalt. The study showed that the softening point, storage stability, and aging performance indicators of polyurethane modified asphalt were superior to SBS asphalt, but the low-temperature ductility was poor. The road performance of two types of asphalt mixtures was evaluated based on rutting tests, bending creep tests, immersion Marshall tests, and freeze-thaw splitting tests. The study showed that polyurethane modified asphalt mixtures can significantly improve the high-temperature performance and water stability of the mixture while ensuring that low-temperature performance does not decay. The engineering application of polyurethane modified asphalt mixture has been carried out, which can reduce the construction temperature of the mixture by 10˚C~20˚C. The Hamburg wheel rutting test shows that polyurethane modified asphalt mixture has good resistance to rutting and water peeling, and the application effect is good.