直投式改性沥青混合料的制备与性能研究

摘要:

通过三维显微观测方法研究不同直投式改性剂与集料在不同条件下的熔融效果；分别使用基质沥青和4.5SBS改性沥青与四种直投式改性剂进行干拌制成沥青混合料,探究进一步提升直投式改性沥青混合料性能的可能性,并通过肯塔堡飞散试验、汉堡车辙试验、冻融劈裂试验研究沥青混合料各项性能。研究表明：不同的直投式改性剂应根据其与集料的熔融效果选用相应的干拌温度和干拌时间；基质沥青与直投式改性剂制成的混合料的抗飞散性能、高温性能和水稳定性能较基质沥青混合料有明显改善,但水稳定性能依旧没有满足规范； 4.5SBS改性沥青与四种直投式改性剂进行干拌后,混合料的各项性能均进一步提高,其中,各个混合料的水稳定性能均达到规范要求； GPJ直投式改性剂的改性效果最为显著。

Abstract:

The melting effect of different direct-injection modifiers and aggregates under different conditions is studied by three-dimensional microscopic observation method; base asphalt and 4.5SBS modified asphalt and four direct-injection modifiers are used for dry mixing. To explore the possibility of further improving the performance of the direct-input modified asphalt mixture, and to study the various properties of the asphalt mixture through the Kentenburg flying test, the Hamburg rutting test, and the freeze-thaw splitting test. Studies have shown that: different direct-injection modifiers should be selected according to their melting effect with aggregates and the corresponding dry-mixing temperature and dry-mixing time; the anti-scattering performance of the mixture made of base asphalt and direct-injection modifiers, The high temperature performance and water stability performance are significantly improved compared to the base asphalt mixture, but the water stability performance still does not meet the specifications; 4.5 SBS modified asphalt is dry mixed with four direct-input modifiers, and the performance of the mixture is uniform. Further improvement, among them, the water stability performance of each mixture meets the specification requirements; the modification effect of GPJ direct injection modifier is the most significant.