温拌再生SMA沥青混合料疲劳性能研究

发布时间：2018-07-26 14:50

【摘要】：温拌再生技术是道路建设行业的一项新技术,该项技术集温拌技术和再生技术的优点于一体。不仅可以降低制备和施工温度,减缓新旧沥青老化,而且使得废旧沥青混合料(reclaimed asphalt pavement, RAP)得到再生利用,节约资源。同时,对环境保护也是非常有益的。然而,温拌再生技术特别是SMA类RAP相关温拌再生技术仍处于理论研究阶段,对温拌剂和RAP综合作用下,其性能变化规律,尤其是疲劳性能方面研究较少,从而导致相关技术的长期耐久性能不明确,因此急需进行SMA类RAP温拌再生技术的疲劳性能研究。由于影响沥青混合料疲劳的因素较多,为确定RAP等对SMA沥青混合料疲劳性能的影响,在考虑到工程实际基础上采用了两种配合比设计方法。第一种是对集料按照各级筛孔进行筛分,保证目标级配的精确性。热拌SMA沥青混合料在0%RAP掺量下进行配合比设计,确定级配和最佳油石比,并以此分别作为0%、20%和30%三种RAP掺量下的再生SMA沥青混合料目标级配和油石比；另外一种方法是考虑到工程实际,不对每档集料进行筛分。对0%、20%及30%三种RAP掺量下热拌再生SMA沥青混合料分别进行配合比设计,确定各自级配和最佳油石比。最后在以上配合比设计的基础上加入3%Sasobit,采用干拌法和湿拌法工艺对RAP进行温拌再生,并对各种SMA沥青混合料进行高温、低温和水稳定性能验证对比。本文对上述集料筛分和集料不筛分两种配合比设计中,RAP掺量在0%、20%及30%情况下,热拌再生SMA沥青混合料和两种不同拌和方式(干拌法和湿拌法)Sasobit温拌再生SMA沥青混合料,进行三种不同应变水平下(750με,950με,1150με)的四点弯曲疲劳试验,汇总劲度模量、疲劳寿命、累积耗散能及相位角等主要数据,研究数据变化规律,并采用现象学方法和累积耗散能方法对试验结果进行分析,揭示各参数之间关系。在对Sasobit温拌再生SMA沥青混合料疲劳数据研究的基础上,从不同RAP掺量、不同沥青混合料技术和不同拌和工艺角度,对Sasobit温拌再生SMA沥青混合料疲劳性能进行分析,揭示RAP掺量、温拌技术及温拌工艺,对温拌再生SMA沥青混合料疲劳性能影响的规律。同时结合对影响沥青混合料疲劳性能的内部因素进行分析,对比集料筛分和集料不筛分方法疲劳试验结果,提出一些改善疲劳性能的措施。
[Abstract]:Warm mixing and recycling technology is a new technology in road construction industry, which integrates the advantages of warm mixing technology and regeneration technology. It can not only reduce the temperature of preparation and construction, slow down the aging of old and new asphalt, but also make the waste and old asphalt mixture (reclaimed asphalt pavement, RAP) recycled and save resources. At the same time, environmental protection is also very beneficial. However, the warm mix regeneration technology, especially the SMA RAP related warm mix regeneration technology, is still in the theoretical research stage. Under the combined action of warm mix agent and RAP, the performance change law, especially the fatigue property, is less studied. As a result, the long-term durability of related technologies is not clear, so it is urgent to study the fatigue performance of SMA type RAP warm mix regeneration technology. Because there are many factors affecting the fatigue of asphalt mixture, in order to determine the influence of RAP on the fatigue performance of SMA asphalt mixture, two mix ratio design methods are adopted on the basis of considering the engineering practice. The first is to sift aggregates according to different sieve holes to ensure the accuracy of target gradation. The mixture ratio of hot-mixed SMA asphalt mixture is designed under the 0%RAP content to determine the gradation and the optimum asphalt ratio, which is used as the target gradation and the oil stone ratio of the recycled SMA asphalt mixture with 0% and 30% RAP respectively. Another method is to not sift each aggregate in the light of engineering practice. The mixture ratio design of hot mix recycled SMA asphalt mixture with 20% and 30% RAP was carried out to determine their gradation and the optimum ratio of oil stone. Finally, on the basis of the above mix ratio design, add 3 Sasobit, adopt dry mixing process and wet mix process to regenerate RAP, and compare the high temperature, low temperature and water stability performance of various SMA asphalt mixture. In this paper, under the conditions of 20% and 30% SMA asphalt mixture, hot mix recycled SMA asphalt mixture and two different mixing methods (dry mixing and wet mixing) Sasobit warm mixed recycled SMA asphalt mixture were used in the mixture design of screening and non-sieving of aggregate and aggregates without sieving, and the content of rap was 20% and 30% respectively, and the content of rap was 20% and 30% respectively. Four point bending fatigue tests were carried out at three different strain levels (750 渭蔚 -950 渭蔚 -1150 渭蔚). The main data such as stiffness modulus, fatigue life, cumulative dissipation energy and phase angle were summarized, and the variation of the data was studied. The phenomenological method and the cumulative dissipative energy method are used to analyze the experimental results and to reveal the relationship between the parameters. Based on the study of fatigue data of Sasobit warm mix recycled SMA asphalt mixture, this paper analyzes the fatigue performance of Sasobit warm mix recycled SMA asphalt mixture from different RAP content, different asphalt mixture technology and different mixing technology, and reveals the content of RAP. The effect of warm mixing technology and warm mixing technology on fatigue performance of warm mix recycled SMA asphalt mixture. At the same time, the internal factors affecting the fatigue performance of asphalt mixture are analyzed, and some measures to improve the fatigue performance are put forward by comparing the fatigue test results of aggregate screening method and aggregate non-sieving method.
【学位授予单位】：北京建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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