轻组分预补填料对沥青胶浆低温性能影响效应分析

发布时间：2018-05-13 04:30

本文选题：沥青胶浆 + 油页岩废渣　；参考：《吉林大学》2017年硕士论文

【摘要】：低温开裂是季冻区常见的路面病害,其严重影响了沥青道路的使用寿命。从组分的角度,沥青路面开裂的主要原因是在生产和服役阶段由于老化作用导致沥青混合料中的轻质组分挥发和转化成了其他物质,导致其组分比例发生变化,进而导致宏观上沥青路面的使用性能下降,在外界荷载和温度应力等作用下发生开裂或者松散剥落破坏。目前关于如何提高季冻区沥青路面的抗开裂和抗松散能力的问题已经成为广大道路工作者广泛关注的课题。本项研究主要是从沥青中轻质组分占沥青总质量的比例入手,探究一种可以在沥青道路老化过程中持续对沥青进行轻组分补充的办法,降低沥青道路病害发生的机率,改善沥青混合料的路用性能。实验开发了一种轻组分预补填料,进行了轻组分预补填料对沥青胶浆低温性能的影响效应分析,并对该填料的工作性能进行了评价。油页岩原岩提炼油分时,由于高温作用会导致产生的油页岩废渣含有大量的微观孔隙结构。本文以油页岩废渣为载体,将轻组分预先植入这些微观孔隙之中从而制备成沥青轻组分预补填料。沥青选用中海油90#沥青和基于中海油90#沥青制备的SBS改性沥青。根据长期老化作用后沥青轻质组分损失比例,确定了一种可以等效于标准长期老化模拟实验(RTFOT+PAV)并可以获得大量沥青胶浆样本的等效处理方法,再结合油页岩废渣吸附轻组分的能力,确定了该种轻组分预补填料的掺加比例。依据体积相等的原则,确定了对比实验中普通石灰岩矿粉填料的掺加量。将两种沥青和两种矿粉分别混合制备成了四种沥青胶浆。进行四种沥青胶浆在老化前后的软化点、延度测试、沥青胶浆小梁弯曲试验、弯曲梁蠕变试验和低温粘结强度定量测试,基于试验获得的沥青胶浆常规性能指标、沥青胶浆极限弯曲破坏强度和极限弯曲破坏应变、沥青胶浆弯曲蠕变劲度变化率m等极限破坏参数和疲劳破坏参数、沥青胶浆低温粘结强度来评价轻组分预补填料的工作性能。实验结果表明:该种轻组分预补填料可以弱化老化效应对沥青胶浆性能的影响,提高沥青胶浆的工作性能,是一种简单可行的抗老化措施。
[Abstract]:Low temperature cracking is a common pavement disease in seasonal freezing area, which seriously affects the service life of asphalt road. From the component point of view, the main reason for the cracking of asphalt pavement is that the light components in asphalt mixture volatilize and convert into other substances during the production and service stage, which results in the change of the proportion of the components. Thus, the performance of asphalt pavement is decreased, and cracking or loosely spalling occurs under external load and temperature stress. At present, how to improve the anti-cracking and anti-loose ability of asphalt pavement in seasonal frozen area has become a widespread concern of road workers. This research mainly starts with the proportion of light components in asphalt to the total asphalt mass, and explores a method that can continuously supplement asphalt with light components in the course of asphalt road aging, so as to reduce the probability of asphalt road disease. Improve the pavement performance of asphalt mixture. A light component prefilled filler was developed experimentally. The effect of the light component prefilled filler on the low temperature performance of asphalt mortar was analyzed, and the working performance of the filler was evaluated. When oil shale is extracted from oil shale, the waste residue of oil shale contains a lot of micropore structure due to high temperature. In this paper, oil shale waste residue is used as carrier, light components are pre-implanted into these micro-pores to prepare asphalt light component pre-filled filler. CNOOC 90# asphalt and SBS modified asphalt based on Cnooc 90# asphalt are selected. According to the proportion of light component loss of asphalt after long term aging, an equivalent treatment method is established, which can be equivalent to the standard long term aging simulation experiment RTFOT PAV) and can obtain a large number of asphalt mortar samples. Combined with the ability of oil shale waste residue to adsorb light component, the proportion of the light component prefilled filler was determined. According to the principle of equal volume, the addition amount of ordinary limestone filler in contrast experiment was determined. Four kinds of asphalt paste were prepared by mixing two kinds of bitumen and two kinds of mineral powder. The softening point, ductility test, trabecular bending test, creep test and low temperature bond strength test of four kinds of asphalt mortar before and after aging were carried out. The ultimate failure and fatigue failure parameters such as ultimate bending failure strength and ultimate bending failure strain of asphalt mortar, change rate of bending creep stiffness m of asphalt mortar, and low temperature bond strength of asphalt mortar were used to evaluate the working performance of lightweight pre-filled filler. The experimental results show that this kind of lightweight pre-filled filler can weaken the effect of aging on the performance of asphalt mortar and improve the working performance of asphalt mortar. It is a simple and feasible anti-aging measure.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

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