基于旧沥青分类分级方法的再生沥青混合料性能研究

发布时间：2018-01-24 02:10

本文关键词： 旧沥青混合料性状分析分类分级再生配合比设计路用性能　出处：《扬州大学》2015年硕士论文　论文类型：学位论文

【摘要】：旧沥青路面材料(简称RAP)的再生利用能够节约大量的砂石和沥青材料,避免废料的堆放、填埋造成环境污染,对实现道路资源可持续发展具有着重要意义。到目前为止我国沥青路面再生利用时对RAP的性状差别重视不够,不能很好地根据各种RAP的性状分析最大程度地回收利用。本研究从各等级道路选取了多种RAP,基于旧沥青分类分级再生方法,对其的老化性能进行分析,评定其老化等级,根据不同的老化等级研究与其相应的再生措施,使其在沥青路面再生利用时能够最大化利用,最终选取了4种代表性的RAP对其进行分类分级再生研究。首先,根据4种RAP的沥青类别及老化等级确定其相应的再生方法,分别对4种旧沥青使用加新沥青或再生剂方法再生,并对使用不同方法再生的沥青进行抗老化性能研究,评价其抗二次老化性能。研究发现：再生沥青经过薄膜老化试验后,两类再生沥青的残留针入度比都符合规范规定,黏度比也保持在稳定的范围内,说明经过不同再生方法所得的再生沥青的抗再次老化性能能够满足路用要求。通过对选取的4种RAP进行沥青抽提和集料筛分,对其性状进行分析评价,研究发现,各种RAP中旧沥青的含量差距较大,除了与原始设计的油石比有关外,RAP的老化程度越严重,沥青含量相对较少。RAP集料筛分级配曲线基本呈现S形走向,集料细化比较明显。根据4种RAP的性状评价,分别按其掺量0%,20%,30%,40%的比例进行厂拌热再生配合比设计,确定了最佳油石比以及不同RAP掺量下的配合比。最后,基于旧沥青分类分级再生方法,对RAP在不同的掺量下按添加新沥青或再生剂的方法再生,研究再生沥青混合料的路用性能。研究结果表明：相对于高温性能和疲劳性能而言,低温性能和水稳定性更宜作为评价和控制再生沥青混合料路用性能的两个指标；SBS类再生沥青混合料的路用性能受RAP老化等级的影响更大,而道路石油类再生沥青混合料的路用性能受RAP老化等级的影响较小；不同RAP在相同掺量下老化等级低的再生料路用性能更好；对比分析不同再生方法的再生效果,加再生剂的再生沥青混合料路用性能更好,当RAP掺量较高时建议添加再生剂再生。因此,旧沥青混合料进行分类分级再生对实际工程的应用具有重要指导意义。
[Abstract]:The recycling of old asphalt pavement materials (rap) can save a lot of sand and asphalt materials, avoid the waste stacking, and cause environmental pollution. It is of great significance to realize the sustainable development of road resources. Up to now, the difference of RAP characteristics has not been paid enough attention to in the recycling of asphalt pavement in China. Can not be well according to the characteristics of various RAP analysis maximum recovery. This study selected a variety of rap from each grade of roads, based on the old asphalt classification classification and regeneration method. The aging performance of the asphalt pavement is analyzed, and its aging grade is evaluated. According to the different aging grades, the corresponding regeneration measures are studied to maximize its utilization in the recycling of asphalt pavement. Finally, four representative RAP were selected for classification and classification regeneration. Firstly, according to the asphalt classification and aging grade of four RAP, the corresponding regeneration methods were determined. Four kinds of old asphalt were regenerated by adding new asphalt or regenerating agent, respectively, and the anti-aging performance of asphalt was studied by different methods. It is found that the residual penetration ratio of the two kinds of recycled asphalt is in accordance with the specifications and the viscosity ratio is in a stable range after the film aging test. The results show that the reaging resistance of recycled asphalt obtained by different regeneration methods can meet the requirements of road use. Through the extraction of asphalt and the sieving of aggregate, the properties of four kinds of RAP are analyzed and evaluated. It is found that there is a big difference in the content of old asphalt in all kinds of RAP, and the aging degree of rap is more serious than that of the original design. Asphalt content is relatively small. Rap aggregate sieve gradation curve is basically S-shaped, aggregate refinement is obvious. According to the evaluation of the four RAP properties, according to the content of 0% 20% 30%. The ratio of 40% to 40% was designed to determine the optimum ratio of stone and RAP. Finally, the classification and regeneration method based on the old asphalt was proposed. The road performance of recycled asphalt mixture was studied by adding new asphalt or regenerating agent to RAP under different contents. The results showed that compared with high temperature performance and fatigue performance. Low temperature performance and water stability are more suitable to evaluate and control the road performance of recycled asphalt mixture. The road performance of SBS recycled asphalt mixture is more affected by RAP aging grade, while the road performance of road oil recycled asphalt mixture is less affected by RAP aging grade. The road performance of different RAP recycled materials with low aging grade is better under the same dosage. By comparing and analyzing the regeneration effect of different regeneration methods, the recycled asphalt mixture with regenerative agent is better in road performance, and it is suggested to add regenerating agent to regenerate asphalt mixture when the content of RAP is high. Classification and classification of old asphalt mixture is of great significance to the application of practical engineering.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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