再生沥青改性的机理与试验研究

发布时间：2018-03-31 12:53

本文选题：老化沥青　切入点：沥青再生　出处：《大连理工大学》2015年硕士论文

【摘要】：随着我国公路事业的蓬勃发展,路面养护问题日益显现,其中被广泛应用的再生技术是一个拥有广阔市场前景、集经济效益和社会效益都有优势的养护手段。相比国外成熟的再生研究与应用体系,我国在再生领域仍有欠缺和不足。国内很多的工程在选用再生手段新建或改建道路过程中发现,再生后的沥青混合料使用效果不尽人意。所以从材料角度考虑,本文作者为改变以上的情况,在沥青混合料再生后添加改性剂,使得再生后的沥青得到改性剂改性,因此,本文将重点研究此种方案的可行性。本文在以往众多学者的研究基础之上,将再生后的道路沥青添加改性剂,使得沥青由老化状态变为改性再生状态。由于在再生方向,多数学者研究的是再生工艺、再生设备、再生剂添加比例以及再生后混合料性能几个大的方面,虽说沥青再生是老化的一个逆向过程,但是将老化沥青再生,无法完全恢复之前本身沥青所有的内部分子结构,多数仅仅满足路用性能,且再生效率无法达到100%。联想到SBS沥青性能优于基质沥青,所以再生后得到SBS改性,一方面能更好的节省资源,另一方面,能延长再生后路面的使用寿命。具体的本文研究内容如下：1、分析沥青的再生机理和改性机理,通过沥青试验将老化沥青再生后改性计划进行试验实施,对再生后改性的沥青性能与老化的性能对比,对再生剂和改性剂的用量进行理论和试验确定,同时对沥青的三大指标、四组分、沥青粘附性以及低温弯曲性能等进行细致分析；2、在微观机理层面,通过红外光谱法观察再生剂和SBS改性剂在分别针对沥青再生和改性的过程中互相是否有干扰,二者能否协同作用,使得老化沥青转变为改性再生沥青,具体通过光谱图显示的沥青成分中基团的变化来分析；3、在沥青混合料试验方面,根据沥青试验得到的结果,做沥青混合料试验以验证沥青混合料再生后改性方案的可行性。观测再生后改性的混合料能否满足路用性能要求,在不同的性能上有何优、劣势等。
[Abstract]:With the vigorous development of highway industry in China, pavement maintenance problems are becoming increasingly apparent. Among them, the widely used regenerative technology is a maintenance method with broad market prospects and advantages in both economic and social benefits.Compared with the mature regeneration research and application system abroad, our country still has the deficiency and the insufficiency in the regeneration field.In many projects in China, it is found that the recycled asphalt mixture is unsatisfactory in the process of using regenerative means to build or rebuild roads.From the point of view of material, the author of this paper, in order to change the above situation, add modifier after the asphalt mixture regeneration, so that the recycled asphalt can be modified by the modifier. Therefore, this paper will focus on the feasibility of this scheme.Based on the previous researches of many scholars, the modified asphalt was added to the regenerated road asphalt, so that the asphalt changed from aging state to modified regenerated state.Since in the direction of regeneration, most scholars are studying several major aspects, such as recycling process, recycling equipment, proportion of regenerating agent and performance of recycled mixture. Although asphalt recycling is a reverse process of aging, it will regenerate aged asphalt.The internal molecular structure of the asphalt itself can not be completely restored, most of them only meet the road performance, and the regeneration efficiency can not reach 100%.It is considered that the performance of SBS asphalt is better than that of base asphalt, so SBS modification after regeneration can save more resources and prolong the service life of recycled pavement on the other hand.The specific research contents of this paper are as follows: 1. The regeneration mechanism and modification mechanism of asphalt are analyzed. Through asphalt test, the modification plan of aging asphalt is tested and implemented, and the performance of asphalt modified after regeneration is compared with that of aging.The amount of regenerating agent and modifier is determined theoretically and experimentally. At the same time, the three indexes, four components, adhesion of asphalt and low temperature bending property of asphalt are analyzed in detail.The infrared spectroscopy was used to observe whether the regenerating agent and SBS modifier interfered with each other in the process of asphalt regeneration and modification, and whether the two could act synergistically to transform the aging asphalt into modified recycled asphalt.In the aspect of asphalt mixture test, according to the results of asphalt test, the asphalt mixture test was done to verify the feasibility of the modified scheme after regeneration of asphalt mixture.It is observed whether the modified mixture can meet the road performance requirements and what are the advantages and disadvantages in different properties.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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