再生沥青—集料界面黏附性能及路用性能研究

发布时间：2018-04-05 07:48

本文选题：再生沥青　切入点：黏附性能　出处：《广西大学》2017年硕士论文

【摘要】：由于沥青路面有其特有的路用性能以及行车舒适性,沥青路面在我国各等级道路中的应用非产广泛。在近十多年来,国家一直对道路建设大量投入,由于长期的使用过程中沥青路面中的沥青老化随着时间的推移而日益严重,路面的使用性能逐渐降低。尤其是早期修建的沥青路面已经进入中修或者重修阶段,为了节约资源、保护环境以及大力发展经济,沥青混合料再生技术就成为了当前研究的重点,而沥青混合料再生的关键就在于旧沥青的再生。本文重点研究再生沥青-集料黏附性能以及路用性能。本文依据的是胶体结构理论对旧沥青进行再生,该理论认为沥青是一种胶体结构,沥青老化导致胶体组分变化而使得胶体失去平衡,再生过程就是添加组分减少的部分以恢复胶体的平衡。通过试验测定沥青材料老化前后的基本性能参数的变化以及再生剂对老化沥青的基本性能的影响,确定再生剂的掺量约为旧沥青质量的14%。通过试验的方法得到与旧沥青性能相似的老化沥青,采用自主设计的拉拔剪切试验方法对基质沥青、再生沥青和老化沥青与集料间的黏附性能进行测定。试验结果发现老化(RTFOT 85min+PAV 20h)沥青的黏附性能远大于基质沥青和再生沥青的黏附性,再生沥青的黏附性略大于基质沥青的黏附性。本文通过试验研究了基质沥青、再生沥青和老化(RTFOT 85min+PAV 20h)沥青混合料的路用性能,主要通过车辙试验探究其高温性能,通过浸水马歇尔试验以及冻融劈裂试验探究其水稳定性,小梁弯曲试验研究其低温性能,用MTS试验机对混合料试件进行疲劳性能试验研究。试验结果表明黏附性能较好的沥青,相应混合料的高温性能也较好。再生沥青混合料的高温性能、低温性能以及水稳定性均满足规范要求。
[Abstract]:Because asphalt pavement has its unique road performance and driving comfort, asphalt pavement is widely used in various grades of roads in China.In the past ten years, the country has been investing a lot in the road construction, because the asphalt aging in the asphalt pavement becomes more and more serious with the passage of time, the performance of the pavement is gradually reduced.In particular, the asphalt pavement built in the early period has entered the stage of medium repair or re-repair. In order to save resources, protect the environment and develop the economy vigorously, asphalt mixture recycling technology has become the focus of current research.The key of asphalt mixture regeneration is the regeneration of old asphalt.This paper focuses on the adhesion and road performance of recycled asphalt-aggregate.This paper is based on the theory of colloidal structure to regenerate old asphalt, which holds that asphalt is a kind of colloidal structure, and the aging of asphalt leads to the change of colloidal component and makes the colloid lose its equilibrium.The regeneration process is the addition of a reduced component to restore the colloid balance.By testing the change of basic performance parameters before and after aging of asphalt materials and the influence of regenerating agent on the basic properties of aging asphalt, it is determined that the content of regenerating agent is about 14% of the mass of old asphalt.The aging asphalt with the same performance as the old asphalt was obtained by the experimental method. The adhesion between the matrix asphalt, the recycled asphalt and the aging asphalt and the aggregate was measured by the self-designed pull-out shear test method.The results show that the adhesion property of the asphalt is much greater than that of the base asphalt and the recycled asphalt, and the adhesion of the recycled asphalt is slightly greater than that of the base asphalt.In this paper, the pavement performance of asphalt mixture with base asphalt, recycled asphalt and aging RTFOT 85min PAV 20h is studied. The high temperature performance of asphalt mixture is studied by rutting test, and its water stability is investigated by immersion Marshall test and freeze-thaw splitting test.The low temperature properties of trabeculae were studied by bending test, and the fatigue properties of mixture specimens were studied by MTS test machine.The test results show that the asphalt with better adhesion performance has better high temperature performance.The high temperature performance, low temperature performance and water stability of recycled asphalt mixture meet the requirements of specifications.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

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