【作者】 林俊涛；

【导师】 陈美祝； 吴少鹏；

【作者基本信息】 武汉理工大学 ， 材料学， 2011， 硕士

【摘要】 沥青路面的预防性养护日益引起公路管理部门及工作者的关注。目前国内外广泛应用的是基于乳化沥青基的预防性养护材料,而其他种类的预防性养护材料应用还比较有限。本文主要研究了有机硅预养护材料对沥青及沥青混合料的养护效果及机理。首先,采用接触角实验研究了有机硅预养护材料自身的憎水性能,然后通过简单渗透实验、渗水系数实验和冻融劈裂实验,研究了有机硅预养护材料在沥青混合料中的渗透与防水效果,并探讨了其防水养护机理。结果表明,有机硅预养护材料与水的接触角为93.6°,具有良好的憎水性能。当有机硅预养护材料用量为600ml/m2时,可使沥青混合料的渗水系数降为Oml/min。另外可以使得3次冻融循环后的沥青混合料的劈裂强度比提高7%-10%,表明有机硅预养护材料对沥青混合料具有良好的防水效果。其次,采用沥青紫外老化与沥青混合料长期热氧老化实验,评价了有机硅预养护材料对沥青及沥青混合料抗老化能力的影响。结果显示,有机硅预防性养护材料降低了紫外老化后沥青的复合模量及车辙因子,同时降低了长期热氧老化后沥青混合料的间接拉伸模量,提高了其抗低温开裂及疲劳性能,表明有机硅预养护材料可以减缓沥青的紫外老化及沥青混合料的热氧老化。最后,通过摆式摩擦仪与构造深度仪,分析了有机硅预养护材料对沥青混合料抗滑性能的影响,并且与改性乳化沥青封层的抗滑影响进行了对比分析。结果显示,有机硅预养护材料降低了沥青混合料的抗滑摆值8-12BPN、构造深度0.2mm,因此其明显降低了沥青混合料的抗滑能力,但其对沥青混合料抗滑性能的影响比改性乳化沥青封层要小。采用喷洒钢渣细料与橡胶粉的方法可以提高有机硅预养护材料处理后路面的抗滑摆值3-5BPN。此外,通过加速加载实验模拟了有机硅预养护材料在车辆荷载作用下的抗磨耗能力,结果表明有机硅预养护材料在加速加载条件下的磨耗损失与沥青膜一致,但是渗透入沥青混合料里面的有机硅预养护材料会继续存在,发挥其防水抗老化的作用。本文的研究结果表明有机硅预养护材料对沥青及其混合料具有良好的养护效果,为未来此类预养护材料在沥青路面中的进一步应用提供了指导。更多还原

【Abstract】 Preventive maintenance of asphalt pavement is of increasing interest to highway agency and engineers, and many preventive maintenance materials based on emulsion asphalt are used all over the world, but other kinds of maintenance materials is limited. The objective of this paper is to investigate the effect of silicone maintenance materials on properties of asphalt and asphalt mixture and its maintenance mechanism.Firstly, contact angle test was conducted to evaluate the waterproof mechanism of silicone maintenance materials, and then the simple penetrate test, penetrability coefficient test and freezing-thawing test were used to evaluate the waterproof ability of silicone maintenance materials on asphalt mixture. The results show that contact angle between silicone maintenance materials and water is higher than 90°, which indicate silicone maintenance materials have excellent waterproof ability. In addition, the results also indicate the silicone maintenance materials can permeate into the void of asphalt mixture to prevent water form it.Furthermore, UV radiation aging test on asphalt and heat oxidative aging test on asphalt mixture were performed to evaluate the aging resistance of silicone maintenance materials. The results show that applying silicone maintenance materials decrease rutting parameter of UV radiation aged asphalt. What is more, the results also show that silicone maintenance materials can improve the low-temperature cracking resistance and fatigue resistance of aged asphalt mixture. Lastly, the effect of silicone maintenance materials on skidding resistance and polishing resistance of asphalt mixture were studied by means of British pendulum test, sand patch test as well as accelerated loading test. The results the silicone maintenance materials may decrease the skidding resistance of asphalt mixture to some degree, its still can meeting the requirements of China’s specification. Moreover, the rubber powder and slag powder can be used to improve the skidding resistance of silicone maintenance materials seal on asphalt mixture. Accelerate loading tests show that silicone maintenance materials can still act as maintenance materials even when the surface of asphalt mixture is polishedThe result of this study mentioned above indicate that silicone maintenance materials exhibit excellent maintenance performance on asphalt mixture, which can support the applications of silicone maintenance materials in the future.更多还原