RAP回收工艺及热再生沥青混合料路用性能关键影响因素研究

发布时间：2018-03-04 03:04

  本文选题：再生沥青路面　切入点：路用性能　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：沥青路面在长期使用过程中,受到行车荷载和自然因素作用下,沥青老化和集料细化逐渐使沥青混合料使用性能下降,从而引起各种路面病害。我国的公路面临着大量的维修养护任务,为解决我国公路大中修过程中产生的大量废弃旧沥青混合料、节省资源消耗、保护生态环境,论文对废旧沥青混合料厂拌热再生问题进行了研究。本文依托成渝高速大修工程,对冷铣斍回收工艺的RAP级配变异性和再生沥青混合料的路用性能影响因素进行系统研究。论文首先通过对不同铣斍工艺下回收的RAP级配变异进行分析,提出最佳的旧沥青混合料铣斍方式。结合沥青含量和级配变异性分析,对RAP进行破碎、筛分、分档处理,并验证了RAP破碎、筛分对变异控制的效果。通过离心分离试验、筛分试验检测回收沥青路面材料中沥青含量、沥青老化分析和矿料级配等项目,综合评价RAP性能。其次,针对沥青路面不同层位对沥青混合料的不同功能需求,对AC-20和ATB-25两种级配在20%RAP掺量下进行再生沥青混合料配合比设计,确定了再生级配和最佳沥青用量。通过试验对RAP掺量、RAP粒径、再生剂添加、再生工艺这四个因素对再生沥青混合料高温性能、水稳性能和低温性能影响分析。试验结果表明:(1)随着RAP掺量的增加再生沥青混合料高温性能增加、水稳定性性能增加、低温性能下降。(2)同一RAP掺量下,RAP粒径对再生沥青混合料性能的影响规律:在高温性能上5~10mm10~16mm0~5mm;水稳性能5~10mm0~5mm10~16mm;低温性能0~5mm5~10mm10~16mm;综合考虑在实际运用中优先使用5~10mm档RAP料。(3)再生剂的添加可以改善再生沥青混合料的空隙率,但是会降低再生沥青混合料的高温和水稳性能。(4)本文确定的室内RAP再生沥青混合料的工艺为:再生剂直接添加到预热的RAP中,拌和时间为210s,RAP预热温度控制在110℃左右的拌和工作组合生产的再生沥青混合料路用性能最佳。最后,对试验路段进行生产配合比设计并铺筑试验路,试验路性能检测满足道路规范要求并对再生沥青混合料的经济和社会效益进行评价。
[Abstract]:Under the action of driving load and natural factors, asphalt aging and aggregate refinement gradually degrade the performance of asphalt mixture in the long service process of asphalt pavement. In order to solve the problem of a large number of abandoned old asphalt mixture produced in the course of highway maintenance in our country, save the consumption of resources and protect the ecological environment, the road in our country is faced with a large number of maintenance and maintenance tasks. In this paper, the problem of heat regeneration of waste asphalt mixture is studied. This paper relies on the Chengdu-Chongqing high speed overhaul project. The RAP gradation variability of cold milling and recovery process and the influencing factors of road performance of recycled asphalt mixture are systematically studied. Firstly, the variation of RAP gradation recovered under different milling and processing processes is analyzed. This paper puts forward the best milling method of old asphalt mixture. Combined with the analysis of asphalt content and gradation variability, the RAP is broken, sieved and graded, and the effect of RAP crushing and screening on the control of variation is verified. In order to evaluate the performance of RAP, the asphalt content, asphalt aging analysis and aggregate gradation of recovered asphalt pavement materials are tested by sieving test. Secondly, the different functional requirements of asphalt mixture for different layers of asphalt pavement are analyzed. The mixture ratio design of recycled asphalt mixture with 20% rap was carried out for AC-20 and ATB-25 gradation, and the reclaimed gradation and optimum asphalt content were determined. The influence of regeneration technology on the high temperature performance, water stability and low temperature performance of recycled asphalt mixture is analyzed. The experimental results show that with the increase of RAP content, the high temperature performance of recycled asphalt mixture increases, and the water stability of recycled asphalt mixture increases. The influence of Rap size on the performance of recycled Asphalt mixture under the same RAP content: 5 10 mm 10 mm 10 mm 10 mm 0 mm 0 mm in high temperature; 5 10 mm 10 mm 10 mm 10 mm 10 10 mm 16 mm in water stability; 0 5 mm 5 mm 5 mm 10 mm 10 mm 10 16 mm in low temperature; 5 mm 5 mm 5 mm 10 mm 10 mm 10 16 mm; 5 mm 10 mm RAP. The addition of agent can improve the porosity of recycled asphalt mixture. However, it will reduce the high temperature and water stability of recycled asphalt mixture.) the process of indoor RAP recycled asphalt mixture determined in this paper is as follows: the recycled agent is added directly to the preheated RAP, The road performance of recycled asphalt mixture produced by mixing and working combination controlled at 110 鈩，

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