【作者】 李伟；

【导师】 凌天清；

【作者基本信息】 重庆交通大学 ， 道路与铁道工程， 2011， 硕士

【摘要】 沥青路面由于其表面平整、无接缝、行车舒适、振动小、噪声低等优点,在越来越多的国家得到广泛应用,但沥青路面对气温、降水和日照等自然条件十分敏感,经过自然气候长期作用,沥青材料不断老化,加之交通量逐年增长和行车荷载的积累、车辆大型化、超载严重、车辆渠化行驶等问题,使路面出现了早期破坏现象。为了不使沥青路面状况继续恶化,延长路面的服务周期,保持路面的使用性能,应采取积极有效地养护措施。针对我国沥青路面出现的开裂、渗水等破坏现象,本项目在研究国外纤维封层技术的基础上,提出了一种新型预防性养护技术——纤维增强封层技术,它主要由一层纤维沥青应力吸收中间层(FR-SAMI)和其上部磨耗层(薄层罩面或微表处)所组成。这种技术兼具应力吸收层和薄层罩面的特点,不仅增强了新旧路面间的粘结性能、减缓反射裂缝的形成,而且有效的改善了路面的服务功能,适用于提高原有沥青路面、桥面铺装以及水泥混凝土路面的防水性能、抗滑性能以及车辙、平整度的修复工作。本文主要研究纤维增强封层组成材料性质和其路用性能,主要包括以下几个研究内容:首先,对纤维增强封层组成材料性质进行研究,FR-SAMI主要由改性乳化沥青和玻璃纤维组成,上覆薄层罩面选用SMA沥青混合料,在规范基础上对SMA-10级配进行调整,获得较好的路用性能。其次,研究了FR-SAMI主要性能:粘结性能、抗渗性能和抗反射裂缝性能,并通过粘结性能来确定FR-SAMI组成材料的最佳用量。采用正交试验法进行试验的设计,通过剪切强度和粘结强度两个性能指标来评价新旧路面界面间的粘结强度性能,并确定出FR-SAMI各材料最佳用量;利用常用夹层材料橡胶应力吸收膜、聚酯玻纤布和SBS粘层油与FR-SAMI作粘结性能对比,说明FR-SAMI夹层具有良好的粘结性能。通过暴露轮碾渗水试验和热碾压后抗渗性试验,来说明FR-SAMI夹层具有良好的防水性能。采用往复轮碾试验来讨论FR-SAMI的抗反射裂缝能力,分析了FR-SAMI的阻裂机理,讨论了纤维长度是否对抗裂性能起到影响,并与常用夹层聚酯玻纤布、玻纤格栅、只有SBS粘层油做了抗裂性能比较。最后结合楚大高速上的试验路进行分析,介绍了纤维增强封层的施工工艺,及试验路运行一年多后进行的检测,说明了该技术具有良好的广泛应用前景。更多还原

【Abstract】 Because of its smoothness, no connection joints, driving comfort, small vibration, lower noise and other advantages, asphalt pavement was widely used in more and more countries. But the asphalt pavement was very sensitive to temperature, precipitation, sunshine and other natural conditions. Throgh long term effects of natural weather, asphalt material was continuous aging, in addition to increasing traffic volume year by year and accumulation of traffic load, large-scale vehicle, severe overload, chemotactic driving and other damages, early destruction phenomenon appeared in road pavement. In order not to make the asphalt pavement satus continue to deteriorate, to extend service period and maintain performance of road pavement, it should be taken positive and effective conservation measures. In view of surface cracking, seepage and other damage phenomena of asphalt pavement in China, the paper proposed a new type of preventive maintenance technology as Fibre Reinforcing Seal Technology on the base of foreign fibre seal course, which was mainly composed of fibre reinforcing stress absording memberane interlayer (FR-SAMI) and the upper wearing course (thin overlay or micro-surfacing). The technology combined the features of stress absorbing memberane and thin overlay, which could not only enhance the bond behavior between old and new pavement, put off the formation of reflection crack, but also could improve road service effectively. Fibre Reinforcing Seal was used for improving the waterproof property and skid resistance property of existing asphalt pavement, bridge deck pavement, cement concrete pavement and the restoation of rutting and smoothness. This paper mainly studied the material properties and road performance of Fibre Reinforcing Seal, and mainly included the following several aspects of research work.Firstly, material properties of Fibre Reinforcing Seal Technology were researched. FR-SAMI was composed of modified emulsified asphalt and E-glass fibres, SMA was selected as thin overlay, which had been adjusted slightly on the basis of norms. It was obtained better road performance.Secondly, the paper studied the main properties of FR-SAMI, including bond properties, waterproof property, cracking resistance, and determined the optimum amount of various materials of FR-SAMI. Using orthogonal method for test design and applying two performance indicators as shear strength and bond strength to evaluate bond behavior of the interface between old and new pavement, the optimum amount of various materials of FR-SAMI was determined. Asphalt rubber stress absorbing menberane, fiberglass-ployester and SBS bonding oil were selected to compare with FR-SAMI in bond behavior, which was shown that FR-SAMI had good bond property. It was shown that FR-SAMI had good waterproof property through exposure tracing seepage test and impermeability test after hot rolling. Cracking resistance of FR-SAMI was discussed by reciprocating roller wheel test. The paper analysised cracking resistance mechanism of FR-SAMI, discussed whether the fiber length could influence cracking resistance. Fiberglass-ployester, fiberglass geogrid and SBS bonding oil was selected to carry out in the comparative tests of crack resistance with FR-SAMI.Finally, it was analysised combining with Chuda highway test section, described the construction technoloyg of Fibre Reinforcing Seal, and detected the test road after running more than one year. It was illustrated that the technology had wide application and good prospects..更多还原