复合改性橡胶沥青细观特征及其混合料路用性能试验研究

发布时间：2018-02-20 15:46

  本文关键词： 复合改性 橡胶沥青 旋转粘度 电镜扫描 细观特征 路用性能　出处：《长沙理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：在石油沥青中加入废胶粉改性而成的橡胶沥青的出现,解决了废旧轮胎大量堆积问题,并且相比于普通沥青,橡胶沥青的各项性能更加优异,但是橡胶沥青由于自身特性也存在着很多问题,如：储稳定性较差；在施工过程中处于一种不稳定状态很难有效控制等。因此,橡胶沥青有待进一步改善和提高。通过在橡胶沥青加工过程中掺加一定比例的改性添加剂,形成复合改性橡胶沥青,提高橡胶沥青的技术性能,探讨橡胶沥青储运和摊铺、控制橡胶沥青的黏度、降低离析现象影响稳定性等问题,这是对橡胶沥青研究的一个新方向。本文对三鑫、五洲、营口3家复合改性橡胶沥青进行了性能试验研究、沥青细观特征研究、混合料路用性能试验研究。对三鑫、五洲、营口3家沥青进行了针入度试验、延度试验、软化点试验、旋转粘度试验、弹性恢复试验以验证复合改性橡胶沥青的性能,试验结果表明3家沥青的各项性能优异。沥青的旋转粘度历时试验结果表明,三鑫、五洲、营口3家沥青旋转粘度值满足规范标准所持续的时间明显高于普通橡胶沥青。并且我们得到了4种沥青旋转粘度值满足标准的时间范围,可以指导我们在合适的时间使用这些沥青。通过沥青的粘度温度关系试验我们发现,随着温度的降低,沥青的旋转粘度值不断增大,并且增加的幅度在不断扩大。对三鑫、五洲、营口3家沥青在旋转黏度试验中不同的特征时间点留存的样品进行电镜扫描试验,取得它们的SEM电镜扫描图像与EDS成分分析图像,结果表明,随着时间的延长,加入改性剂后的复合改性橡胶沥青经历了一个由初始阶段的部分反应到粘度峰值的完全反应,再到后来的相互脱离发生离析现象的过程,反应了复合改性橡胶沥青材料随时间的反应变化情况,验证了复合改性橡胶沥青黏度历时特征。对三鑫、五洲、营口3家沥青混合料进行配合比设计,确定矿料级配和最佳油石比。进行沥青混合料的车辙试验、劈裂试验、低温弯曲试验、浸水马歇尔试验和冻融劈裂试验以检验沥青混合料的高温性能、低温性能以及水稳定性能,结果表明,3家沥青混合料的各项路用性能优异。
[Abstract]:The appearance of rubber asphalt modified by waste rubber powder in petroleum asphalt solves the problem of mass accumulation of waste tires, and compared with ordinary asphalt, rubber asphalt has better performance. However, due to its own characteristics, rubber asphalt also has many problems, such as poor storage stability, difficult to control effectively in a unstable state during construction, etc. Rubber asphalt needs to be further improved and improved. By adding a certain proportion of modified additives in the process of processing rubber asphalt, compound modified rubber asphalt is formed to improve the technical performance of rubber asphalt, and the storage, transportation and spreading of rubber asphalt are discussed. It is a new direction to study rubber asphalt by controlling the viscosity of rubber asphalt and reducing segregation phenomenon, which is a new direction in the study of rubber asphalt. In this paper, three kinds of compound modified rubber asphalt, Sanxin, Wuzhou and Yingkou, have been tested and studied. Research on Asphalt Meso-Characteristics and pavement performance Test of mixture. The penetration test, ductility test, softening point test, rotary viscosity test of Sanxin, Wuzhou and Yingkou asphalt have been carried out. The elastic recovery test was used to verify the performance of the compound modified rubber asphalt. The results showed that the three asphalts had excellent properties, and the rotational viscosity duration test of the asphalt showed that Sanxin, Wuzhou, Sanxin, Wuzhou, Sanxin and Wuzhou, The rotation viscosity value of three asphalt in Yingkou is obviously longer than that of common rubber asphalt, and the time range of four kinds of asphalt to meet the standard has been obtained. It can guide us to use these bitumen at the right time. Through the viscosity and temperature relation test of asphalt, we find that with the decrease of temperature, the rotational viscosity value of asphalt increases, and the range of increase is constantly expanding. The samples retained at different characteristic time points in the rotational viscosity test of three asphalt in Wuzhou and Yingkou were scanned by electron microscope, and their SEM scanning images and EDS composition analysis images were obtained. The results showed that, with the extension of time, After the addition of modifier, the compound modified rubber asphalt experienced a complete reaction from the initial partial reaction to the peak viscosity, and then to the process of separation from each other. The reaction of compound modified rubber asphalt material with time was studied, and the characteristics of viscosity of compound modified rubber asphalt were verified. The mix ratio design of Sanxin, Wuzhou and Yingkou asphalt mixtures was carried out. To determine the mineral aggregate gradation and the optimum oil / stone ratio. To test the high temperature performance of asphalt mixture by rutting test, splitting test, low temperature bending test, immersion Marshall test and freeze-thaw split test. The results of low temperature performance and water stability show that the road performance of the three asphalt mixtures is excellent.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414
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本文编号：1519345