基于BBR试验的纤维沥青结合料低温性能研究

Study on Low Temperature Performance of Fibrous Asphalt Binder Based on BBR Test

为了研究纤维对沥青低温性能的影响,本文选用了三种常用的路用纤维以不同掺量进行纤维沥青结合料的制备,通过-12℃以下的BBR试验得到了聚丙烯纤维、聚酯纤维和聚丙烯腈纤维沥青结合料的劲度模量S和蠕变速率m等低温指标。结果表明:聚丙烯纤维、聚酯纤维及聚丙烯腈纤维的最佳掺量分别为3%、3%和4%,并且在此掺量下,聚丙烯纤维对沥青低温性能的改善效果最好,其次是聚酯纤维,聚丙烯腈纤维最差。

In order to study the influence of the low temperature performance of asphalt,three commonly used in road fibers were selected in this paper to prepare fiber asphalt binder with different dosage.Through the BBR test below-12℃,the low temperature indexes such as stiffness modulus S and creep rate M of the asphalt binder of polypropylene fiber,polyester fiber and polyacrylonitrile fiber were obtained.The results show that the optimal content of polypropylene fiber,polyester fiber and polyacrylonitrile fiber is 3%,3%and 4%,respectively,and polypropylene fiber has the best improvement effect on the low temperature performance of asphalt in this con⁃tent,the second is polyester fiber,and the worst is polyacrylonitrile fiber.