【作者】 邢傲雪；

【导师】 郝培文；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2010， 硕士

【摘要】 我国20世纪80年代修建的沥青路面已陆续进入大中修阶段,随之会产生大量废旧沥青混合料。沥青路面冷再生技术可将旧沥青路面材料重复利用,提高资源利用率,保护生态环境,符合国家发展循环经济和实现可持续发展的战略方针。因此,对沥青路面冷再生技术进行研究具有重要的现实意义。目前我国对于冷再生混合料的研究主要集中在原材料、混合料配合比设计及常规强度等方面,而对于其耐久性能、抗剪特性和动态模量方面的研究较少。因此,本文通过大量室内试验,针对乳化沥青再生混合料的永久变形特性、疲劳性能、抗剪特性及动态模量展开深入研究,并与泡沫沥青再生混合料进行对比,从而促进该技术在我国的应用。永久变形特性是乳化沥青再生结构层的重要性能之一。本文采用动态压缩蠕变试验分析了不同材料组成对乳化沥青再生混合料永久变形特性的影响,结果表明：一定程度增大水泥用量以及减少乳化沥青用量,可提高乳化沥青再生混合料的抗变形能力；泡沫沥青再生混合料的抗永久变形性能优于乳化沥青再生混合料。抗疲劳性能是乳化沥青再生混合料铺筑路面基层或下面层时必须优化设计的关键性能。本文采用间接拉伸劈裂疲劳试验分析了不同材料组成对乳化沥青再生混合料疲劳性能的影响,分析表明：在小掺量条件下水泥增多有助于提高乳化沥青再生混合料的抗疲劳性能；最佳乳化沥青用量下再生混合料具有良好的抗疲劳性能以及强度与变形能力；泡沫沥青再生混合料的应力敏感性要大于乳化沥青再生混合料；乳化沥青再生混合料的抗疲劳性能介于半刚性基层材料与热拌沥青混合料之间。本文采用贯入剪切试验研究不同材料组成对乳化沥青及泡沫沥青再生混合料25℃和60℃抗剪特性影响,结果表明：随着水泥掺量的增大,乳化沥青及泡沫沥青再生混合料的各抗剪指标均显著增大；随着乳化沥青或泡沫沥青用量的增大,再生混合料的最大剪应力和内摩阻角均减小,粘聚力先增大后减小；泡沫沥青再生混合料的最大剪应力大于乳化沥青再生混合料；采用汉堡车辙试验对不同沥青特性冷再生混合料的高温抗剪性能及水稳定性进行研究,结果表明冷再生混合料高温与水稳定性组合的综合排序为：壳牌SBS改性乳化沥青>泡沫沥青>壳牌普通乳化沥青>国产Y乳化沥青。对再生混合料的动态模量进行研究可为将来的冷再生结构层设计及混合料性能评价提供依据。本文采用动态三轴试验对乳化沥青及泡沫沥青冷再生混合料在不同材料组成、不同温度及不同围压下的三轴动态模量进行研究,结果表明再生混合料的动态模量均随着围压、水泥用量的增大、乳化(泡沫)沥青用量的减小、温度的降低而增大。更多还原

【Abstract】 The asphalt pavement constructed in the 1980s in our country early is entering into rehabilitation period, which produces a large amount of reclaimed asphalt mixture.The technology of asphalt pavement rehabilitation, which can reuse the old asphalt mixture, raise resource utilization ratio and protect ecological environment, accords with the strategic policy of developing recycle economy and realizing sustainable development in our country. So the study of the cold recycling technology has important practical significance.The study of cold recycling mixture mainly focuses on the material mixture design and conventional strength currently . However, studies about the permanent deformation performance,the resistance to shear performance and dynamic modulus about cold recycling asphalt mixture have a little at present. Through a lot of laboratory experiments, the paper aims to systematically study permanent deformation performance, fatigue performance, resistance to shear performance and dynamic modulus of the cold asphalt recycling mixture with emulsified,and also compared with foamed asphalt mixture.The permanent deformation of emulsified asphalt recycled pavements is very important for pavement structure. The paper adopted the dynamic compression creep test to analyze the effect of mix composition on permanent deformation . It was found that increasing a amount of cement or decreasing emulsified asphalt content at a certain degree, it can improve the deformation resistance of the cold recycling mixture with emulsified asphalt. Foamed asphalt recycled mixture has superior deformation resistance over emulsified asphalt recycled mixture.Fatigue resistance is a paramount performance needed to be optimized for cold recycling mixture with emulsified asphalt, which are used for base or subbase layers in pavements. This paper adopts the indirect tensile fatigue test to study of the influence of different material compositions on fatigue properties of emulsified asphalt recycled mixes. The results showed that with increasy of cement at a small amount, the improvement of fatigue resistance for emulsified asphalt recycled mixtures. The recycled asphalt mixes at optimum emulsified asphalt content have relatively good fatigue resistance, strength and flexibility. The stress sensitivity of foamed asphalt recycled mixture is higher than the emulsified asphalt recycled mixture. Fatigue resistance of emulsified asphalt recycled mixes is between semi-rigid material and HMA. The paper uses the penetration shear test to study of the influence of different material compositions on shear resistance performance of emulsified asphalt and foamed asphalt recycled mixes at the temperature of 25℃and 60℃. It was indicated that increase of cement is beneficial to the increase of shear index for emulsified asphalt and foamed asphalt recycled mixes. With the increasing of emulsified asphalt and foamed asphalt content,the maximum shear stress and internal friction angle are decreased, but the cohesion is increased at first then decreased. The maximum shear stress of foamed asphalt recycled mixes is larger than emulsified asphalt recycled mixes.The Hamburg rutting test is used to analysis water stability of cold recycled mix with different asphalt properties. The water stability of asphalt mixture is ranked as follows:shell SBS modified emulsified asphalt>foamed asphalt> shell general emulsified asphalt> domestic emulsified asphalt Y.The study on dynamic modulus of cold recycling mixture can provide the basis for cold recycling layer design and mixture performance evaluation. The paper uses dynamic triaxial tests to study the dynamic modulus of different material compositions,temperature and confining pressure of emulsified asphalt and foamed asphalt recycled mixes.The results shows that the dynamic modulus increases with the increase of confining pressure, cement amount and the decrease of emulsified (foamed)asphalt amount and temperature.更多还原