【作者】 耿九光；

【导师】 戴经梁；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2009， 博士

【摘要】 沥青路面材料再生技术具有显著的经济、社会和环境效益，是一项符合可持续发展要求的道路维修措施。随着我国越来越多的沥青路面进入养护维修期，该技术的推广应用势在必行。但目前我国的沥青路面再生技术还处于起步阶段，基础理论研究和工程经验都比较缺乏，尤其是对改性沥青路面再生技术的研究更少。因此，本文深入分析了基质沥青及改性沥青的老化机理，然后在此基础上开发了新型再生剂，并进行了沥青及沥青混合料的热再生技术研究。论文首先系统地研究了路面沥青回收试验方法，试验发现规范方法容易造成矿粉和溶剂的残留问题。通过对回收方法的改进最大程度的减小了抽提回收过程对沥青性质的影响，提高了旧路面沥青性能评价的可靠性。其次，论文利用室内模拟老化试验研究了沥青在不同老化条件下的老化规律，比较了路面回收沥青和室内老化沥青老化程度的对应关系。通过对老化沥青的性能测试分析了基质沥青与改性沥青抗老化特性的差异，采用组分分析、红外光谱分析和凝胶色谱分析等化学分析手段研究了沥青的老化机理，揭示了改性沥青抗老化性能优于基质沥青的根本原因。在分析沥青老化和再生原理的基础上，开发了新型沥青再生剂。通过再生剂再生沥青试验考察了再生剂的性能；确定了再生剂最佳用量；并利用分层抽提试验和流变试验研究了再生剂在沥青中的扩散规律。同时，针对当前再生剂评价方法的不足，提出了采用电导率试验评价再生剂再生效果的试验方法。对不同再生剂的试验结果表明本文开发的再生剂对沥青质的胶溶能力较好，从沥青本质的胶体结构角度证明了该再生剂的优越性能。论文采用添加新沥青、再生剂两种再生方法对基质沥青和改性沥青进行了再生研究，详细探讨了再生沥青的路用性能，从微观角度分析了再生沥青的老化机理。研究了再生沥青抗老化性能，提出了利用Arrhenius图预估沥青使用寿命的试验方法。最后，论文通过室内试验研究了再生沥青混合料的配合比设计方法，分析了回收沥青混合料掺配比例对配合比设计的影响。采用旋转压实仪研究了再生沥青混合料的压实特性，提出了最佳拌和温度和压实温度的确定方法。从高温稳定性、低温抗裂性、水稳定性和耐久性等方面对再生沥青混合料路用性能进行了研究，试验证明再生沥青混合料具有良好的路用性能。更多还原

【Abstract】 The adoption of asphalt pavement recycling technology has economic benefits, social benefits and environment benefits, and it is in accordance with the present trend toward sustainable development. As massive early constructed highway entering repairs period gradually, the research and use of recycling technology of asphalt pavement materials is necessary. However, asphalt pavement recycling technology in our country is still in initial stage, the basic theory research and the engineering project experience are deficient, especially for the recycling of polymer modified asphalt. Therefore, the aging mechanism of the base asphalt and polymer modified asphalt was analyzed, then a new type of recycling agent was developed and the recycling technique of asphalt and asphalt mixture was investigated in this foundation.Firstly, the extraction method of pavement asphalt was studied systematically. The experiment results showed that the norms methods had the problem of residual filler and solvent. Through the improvement of extraction methods, the influence of extraction process on the properties of asphalt was reduced in the greatest degree, and the reliability of performance evaluation of the old pavement asphalt was enhanced.Secondly, the aging rules and aging mechanism of asphalt under different aged condition was studied with simulation aging experiment, and the correlation between the reclaimed asphalt and indoor aged asphalt was compared. The differences of anti-aging property between base asphalt and polymer modified asphalt was analyzed through the asphalt performance tests. The asphalt aging mechanism was investigated with the chemical analysis methods, such as component analysis, infrared spectroscopy analysis and Gel Permeation Chromatography analysis, revealing the causes of the anti-aging property of polymer modified asphalt surpassing base asphalt.A new recycling agent was developed base on the analysis of asphalt aging principle and asphalt recycling principle. Then the performance of recycling agent was proved, and the optimum dosage of recycling agent was ascertained. The diffusion rules of recycling agent was researched with the stage extraction experiment and rheological experiment. At the same time, for the shortage of evaluation methods of recycling agent, a new test method was invented using the electrical conductivity experiment of the system of asphalt and n-heptane to evaluate the effect of recycling agent. The experiment results of different recycling agent showed that the peptization of recycling agent developed in this paper for the asphaltene is better, and the advantage of this recycling agent was proved from the point of view of asphalt colloid structure.The aged base asphalt and polymer modified asphalt was recycled with new asphalt and recycling agent. Then the performance of recycled asphalt was discussed particularly and the aging mechanism of recycled asphalt was analyzed from the microstructure angle. The anti-aging performance of recycled asphalt was investigated and the life estimation method of recycled asphalt was created based on Arrhenius chart.Finally, the mixture design method of recycled asphalt mixture was processed, and the impact of the RAP content on the optimum asphalt content was analysed. The compaction characters of recycled asphalt mixtures was investigated by gyratory compaction test, and the mixing and compaction temperature was determined. The performance of recycled asphalt mixture, including high temperature performance, low temperature performance, moisture sensitivity and durability performance, were proved as good as the new asphalt mixture.更多还原