沥青路面就地热再生沥青配伍性研究

发布时间：2018-01-07 22:07

本文关键词：沥青路面就地热再生沥青配伍性研究　出处：《南京林业大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着我国公路事业的快速发展，公路大规模建设带来了繁重的养护维修任务，沥青路面再生技术在公路养护维修中越来越被关注。再生沥青混合料通常由新沥青、新集料、旧沥青、再生剂、旧集料按照不同比例设计后组成，，旧沥青、再生剂、新沥青三者之间的配伍性直接关系到再生沥青混合料的路用性能。本文结合依托工程项目，对沥青路面就地热再生沥青配伍性进行研究，为合理选用再生剂和新沥青提供科学的依据。首先对回收的旧路面材料进行评价分析，根据沥青的老化和再生机理，选配A型再生剂、B型再生剂、C型再生剂按照3%，5%，7%，10%的掺配比例与旧沥青进行配伍性试验，测定相关性能试验指标，综合分析确定掺配6%配伍性最优的A型再生剂对旧沥青进行再生。其次将掺配6%A型再生剂的再生沥青分别与SK-70#沥青、中海-70#沥青按照10%，20%，30%，40%的掺配比例进行配伍性试验，测定相关性能试验指标，综合分析优选配伍性较好的SK-70#沥青掺配，确定新沥青的掺量范围为30%～40%。然后对回收的老化沥青、掺配6%A型再生剂的再生沥青、掺配30%SK-70#沥青的混合沥青进行红外光谱分析，红外光谱分析结果表明羰基（C=O）的出现是沥青老化的一个重要特征，沥青老化后亚砜基（S=O）数量增加。由于物理共融作用，再生剂的组分引起再生沥青的组分发生变化，新沥青的组分引起混合沥青的组分发生变化。再生沥青和混合沥青中均以-CH2-的吸收峰最强。最后对掺配不同比例新沥青混合料的复拌就地热再生沥青混合料的路用性能展开了研究，结合新沥青混合料不同掺配比例下路用性能试验数据，参考不同新料掺配比例下实际添加沥青与再生沥青配伍性试验结果，考虑到依托工程项目所在地理位置、气候条件等因素对复拌就地热再生沥青混合料路用性能的要求，从经济效益及满足路面使用性能方面，综合分析拟定添加20%新沥青混合料。
[Abstract]:With the rapid development of highway industry in China, large-scale highway construction has brought heavy maintenance and maintenance tasks. The recycled asphalt mixture is usually composed of new asphalt, new aggregate, old asphalt, recycled agent and old aggregate according to different proportion design. The compatibility of recycled asphalt and new asphalt is directly related to the pavement performance of recycled asphalt mixture. It provides a scientific basis for the rational selection of regenerating agent and new asphalt. Firstly, the recycled old pavement materials are evaluated and analyzed. According to the aging and regeneration mechanism of asphalt, a type of regenerative agent, type A, type B, and type B, type C, are selected according to the ratio of 3% to 5%. The compatibility test of 10% admixture ratio with old asphalt was carried out, and the related performance test indexes were measured, and the comprehensive analysis was made to determine that the type A regenerative agent with the best compatibility of 6% was used to regenerate the old asphalt. Secondly, the recycled asphalt mixed with 6 / A regenerative agent and SK-70# asphalt respectively, and Zhonghai -70# asphalt were tested according to the proportion of 10 ~ 20 ~ 30 ~ 40% mixed with each other. The relative performance test index was measured and the blending of SK-70# asphalt with good compatibility was analyzed synthetically and the range of new asphalt was determined to be 30% 40%. Then, the recycled asphalt, the recycled asphalt mixed with 6A regenerative agent and the mixed asphalt mixed with 30SK-70# asphalt were analyzed by infrared spectroscopy. The results of infrared spectrum analysis show that the appearance of carbonyl Con O) is an important feature of asphalt aging, and the number of sulfoxyl Schio) increases after asphalt aging, due to physical co-melting. The component of recycled asphalt changed and the component of new asphalt changed. The absorption peak of -CH2- was the strongest in recycled asphalt and mixed asphalt. Finally, the remixing of new asphalt mixture with different proportions is studied on the road performance of geothermal recycled asphalt mixture, combined with the new asphalt mixture mixed with different proportion of road performance test data. According to the experimental results of compatibility of asphalt and recycled asphalt with different blending ratio of new materials, the geographical location of the project is considered. From the aspects of economic benefit and pavement performance, this paper comprehensively analyzes the requirements of road performance of remix and remix recycled asphalt mixture, and proposes the addition of 20% new asphalt mixture.
【学位授予单位】：南京林业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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