橡胶沥青混合料路用性能及其温拌效果研究

发布时间：2018-10-23 10:44

【摘要】：随着我国高等级公路建设规模持续提高，对道路建筑材料提出了更严格的要求。因此，如何提高沥青混合料的路用性能，延长道路服役寿命，成为道路材料领域的研究重点。随着我国汽车保有量的不断增长，国内每年产生的废旧橡胶轮胎数量呈加速增长趋势。将废旧轮胎颗粒用于沥青改性，可以实现“黑色垃圾”的再利用，实现废旧材料的再利用和环境保护，具备良好的经济和社会价值。但已有研究成果表明橡胶颗粒的加入使得橡胶改性沥青混合料的拌合及压实温度显著提升，有害气体的排放量增加，并且容易导致沥青老化。如何降低橡胶改性沥青混合料的拌合及压实温度，增强其适用性和经济型具备重要研究意义。因此，本文在国内外已有研究基础上，开展了如下工作：（1）对橡胶改性沥青所采用的基质沥青的基本性能进行了测试，确定了橡胶颗粒的筛分结果，对所采用的温拌剂的有效成分进行阐述。（2）详细分析了剪切温度、剪切时间、剪切速率、溶胀时间以及橡胶颗粒掺量等因素对橡胶改性沥青针入度、软化点以及延度等指标影响，确定了橡胶改性沥青最优制备工艺。制定了本文所采用的橡胶改性沥青技术评价指标体系。（3）选用AC-16C矿料级配，通过室内试验确定了橡胶改性沥青混合料的最佳油石比。车辙试验动稳定度测试结果表明，橡胶颗粒的掺入显著改善了混合料的高温稳定性；低温小梁弯曲试验结果表明橡胶改性沥青混合料的抗弯拉强度、破坏应变以及劲度模量均有所提升；浸水残留马歇尔稳定度以及冻融劈裂抗拉强度比的测试结果显示，橡胶改性沥青混合料的水稳定性能要优于基质沥青。（4）针对温拌橡胶沥青及其混合料的试验结果表明，，温拌剂的加入可以改善橡胶改性沥青的高温稳定性能、温度敏感性和高温粘度等，但对沥青的低温抗裂性能有所影响。路用性能试验结果表明，温拌剂的掺入可以显著改善橡胶改性沥青混合料的高温稳定性能，对低温抗裂性会有不利影响，对水稳定性的影响较小。
[Abstract]:Therefore, how to improve the pavement performance of asphalt mixture and prolong the service life of road has become the research focus in the field of road materials. With the increasing of automobile ownership in China, the number of waste rubber tires produced every year is increasing rapidly. The application of waste tire particles in asphalt modification can realize the reuse of "black garbage", reuse of waste materials and environmental protection, which has good economic and social value. However, the research results show that the addition of rubber particles can increase the mixing and compaction temperature of rubber modified asphalt mixture, increase the emission of harmful gases, and easily lead to asphalt aging. Therefore, on the basis of existing research at home and abroad, this paper has carried out the following work: (1) the basic properties of the base asphalt used in rubber modified asphalt are tested, and the screening results of rubber particles are determined. The effective components of the warm mix agent are described. (2) the factors such as shear temperature, shearing time, shear rate, swelling time and the amount of rubber particles on the penetration of rubber modified asphalt are analyzed in detail. The optimum preparation process of rubber modified asphalt was determined by the influence of softening point and ductility. The technical evaluation index system of rubber modified asphalt was established. (3) AC-16C aggregate gradation was selected to determine the optimum asphalt ratio of rubber modified asphalt mixture through laboratory test. The dynamic stability test results of rutting test show that the mixing of rubber particles improves the high temperature stability of the mixture remarkably, and the low temperature trabecular bending test results show that the flexural tensile strength of the rubber modified asphalt mixture is obviously improved. The failure strain and stiffness modulus are improved, and the test results of residual Marshall stability and the ratio of freeze-thaw splitting tensile strength show that, The water stability of rubber modified asphalt mixture is better than that of base asphalt. (4) the test results for warm rubber asphalt and its mixture show that the addition of warm mix agent can improve the high temperature stability of rubber modified asphalt. Temperature sensitivity and high temperature viscosity influence the low temperature cracking resistance of asphalt. The results of road performance test show that the high temperature stability of rubber modified asphalt mixture can be significantly improved with the addition of warm mixing agent, and the low temperature crack resistance will be adversely affected, and the water stability will be less affected.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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