【摘要】 目的为解决香港地区雨季沥青路面大量积水而导致路面早期破损严重的问题,进行了透水性沥青混合料力学性能及路用性能的试验研究.方法采用美国SHRP计划对沥青混合料路用性能研究的基本原理,评价了3种改性沥青(RM、SBS、SBR)的抗老化性能和3种透水性沥青混合料(PA10、PA14、PA20)的水稳定性、抗永久变形性及路用降噪性.结果改性沥青RM老化前后针入度和软化点的变化值均小于SBS和SBR;透水性沥青混合料PA10的水稳定性、抗永久变形性和路用降噪性明显优于PA14、PA20.结论透水性沥青混合料的集料粒径尺寸对其力学性能及路用性能的发挥有较大的影响,最大公称粒径较小的PA10具有较高的综合性能;RM改性沥青应用在透水性沥青混合料中将明显提高其抗老化性能.更多还原

【Abstract】 This paper presents evaluation on the performance of laboratory and in-situ of three different kinds of porous asphalts in order to solve the initial damage of pavement in Hong Kong. Based on the theory of SHRP of USA the tests of the resistance to water damage and permanent deformation were conducted.The testing results showed that the ratio of penetration and soften point of RM binder before and after ageing are lower than those of SBS and SBR modified binders.At the same time PA10 was found to have satisfactory performance with respect to permanent deformation,resistance to moisture damage and reducing traffic noise,when evaluated in a series of laboratory tests designed to assess the fundamental mechanical properties of the materials.Two basic conclusions are drawn that rubber modified binder will make a great contribution to improving the ability of resistance to aging for porous asphalts and aggregate size has a significant effect on performance of porous asphalts.更多还原