热再生沥青混合料设计及性能试验研究
发布时间：2018-10-18 20:12
【摘要】：在使用数年后,许多沥青路面逐渐发生破坏,出现裂缝、坑槽,严重时发生断裂。如果利用沥青再生技术,及时采取相应的措施对损害的路面进行维修,便可以使损害的路面继续使用,延长其使用年限。沥青路面的再生技术具有着生态效益,将废旧的路面材料再次利用,节约了大量的原材料,解决了当前资源短缺的问题。节约材料的同时降低了经济成本,带来了较好的社会效益。具有这些优点的沥青路面再生技术得到越来越多的关注,成为当今沥青路面研究中的一个热点。 本文在前人研究出的部分成果基础上,从当前国内外的研究现状出发,分析了沥青的老化机理和再生机理；为了提高废旧沥青混合料的利用率,针对热再生沥青混合料中旧料掺配方式以及掺量问题,分析确定了旧料的掺配方式；在此基础上,通过车辙试验和冻融劈裂试验进一步研究了随着旧料掺量的变化,热再生沥青混合料高温性能以及水损害抵抗能力的变化规律。。 文中首先总结了热再生沥青混合料的国内外的研究现状,分析了沥青的老化机理和再生机理,总结了沥青再生的技术途径。 研究了RAP集料和旧沥青的性能,并分析了旧料级配的特点。随着RAP中集料粒径的增加,旧料中的沥青含量呈现下降的趋势。 设计再生沥青混合料配合比时,着重研究了旧料的掺配方式,采用了灰色关联度分析方法对再生沥青混合料的动稳定度与马歇尔特征值进行了灰色关联度分析,得出影响混合料抗车辙能力的主要因素为马歇尔模数。结合马歇尔模数的变异系数结果,选择1#掺配方式(4.75mm～9.5mm集料比例少而9.5mm～13.2mm比例多)进行再生研究。 最后验证了热再生沥青混合料的高温性能和水稳定性能。旧料的掺入可以明显改善热再生沥青混合料的高温性能。随着旧料掺量的增加,混合料的动稳定度与冻融劈裂强度比都呈现出先增加后降低的趋势。在一定的掺量范围内,旧料的掺入有利于再生沥青混合料的水稳定性能,但是需要控制好旧料的最高掺量。研究最后总结了厂拌热再生沥青路面施工工艺,并提出了再生沥青混合料新旧集料加热温度控制的建议。
[Abstract]:After several years of use, many asphalt pavement gradually damage, cracks, potholes, serious fracture. If the asphalt regeneration technology is used and the corresponding measures are taken to repair the damaged pavement in time, the damaged pavement can continue to be used and the service life of the damaged pavement can be prolonged. The recycling technology of asphalt pavement has ecological benefits. The waste pavement materials are reused, which saves a lot of raw materials and solves the problem of resource shortage at present. At the same time, it reduces the economic cost and brings better social benefits. More and more attention has been paid to the technology of asphalt pavement regeneration with these advantages, which has become a hot spot in the research of asphalt pavement. On the basis of some achievements of predecessors, this paper analyzes the aging mechanism and regeneration mechanism of asphalt, in order to improve the utilization ratio of waste asphalt mixture, and from the current research situation at home and abroad, the paper analyzes the aging mechanism and regeneration mechanism of asphalt. In view of the problem of the mixing mode and quantity of used materials in hot recycled asphalt mixture, the mixing mode of used materials is analyzed and determined, and on this basis, through rutting test and freeze-thaw splitting test, the variation of the amount of used materials is further studied. The variation law of high temperature performance and water damage resistance of hot recycled asphalt mixture. This paper first summarizes the research status of hot recycled asphalt mixture at home and abroad, analyzes the aging mechanism and regeneration mechanism of asphalt, and summarizes the technical ways of asphalt recycling. The properties of RAP aggregate and old asphalt are studied, and the characteristics of gradation of used asphalt are analyzed. With the increase of aggregate particle size in RAP, the asphalt content in the old aggregate decreased. In the design of mixture ratio of recycled asphalt mixture, the mixing mode of used asphalt mixture is studied emphatically, and the grey correlation degree analysis method is used to analyze the dynamic stability of recycled asphalt mixture and the Marshall eigenvalue. The main factor affecting the rutting resistance of mixture is Marshall modulus. Based on the result of variation coefficient of Marshall modulus, the regeneration was studied by using the method of 1# mixing (4.75mm~9.5mm aggregate ratio was small and 9.5mm~13.2mm ratio was high). Finally, the high temperature performance and water stability of hot recycled asphalt mixture are verified. The high-temperature performance of hot-recycled asphalt mixture can be improved by adding used materials. With the increase of the amount of used materials, the dynamic stability of mixture and the ratio of freeze-thaw splitting strength are increasing first and then decreasing. In a certain range of admixtures, the addition of old materials is beneficial to the water stability of recycled asphalt mixtures, but the maximum amount of used materials should be controlled well. At last, the paper summarizes the construction technology of reclaimed asphalt pavement, and puts forward the suggestion of heating temperature control of new and old aggregate of recycled asphalt mixture.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414
本文编号：2280243
[Abstract]:After several years of use, many asphalt pavement gradually damage, cracks, potholes, serious fracture. If the asphalt regeneration technology is used and the corresponding measures are taken to repair the damaged pavement in time, the damaged pavement can continue to be used and the service life of the damaged pavement can be prolonged. The recycling technology of asphalt pavement has ecological benefits. The waste pavement materials are reused, which saves a lot of raw materials and solves the problem of resource shortage at present. At the same time, it reduces the economic cost and brings better social benefits. More and more attention has been paid to the technology of asphalt pavement regeneration with these advantages, which has become a hot spot in the research of asphalt pavement. On the basis of some achievements of predecessors, this paper analyzes the aging mechanism and regeneration mechanism of asphalt, in order to improve the utilization ratio of waste asphalt mixture, and from the current research situation at home and abroad, the paper analyzes the aging mechanism and regeneration mechanism of asphalt. In view of the problem of the mixing mode and quantity of used materials in hot recycled asphalt mixture, the mixing mode of used materials is analyzed and determined, and on this basis, through rutting test and freeze-thaw splitting test, the variation of the amount of used materials is further studied. The variation law of high temperature performance and water damage resistance of hot recycled asphalt mixture. This paper first summarizes the research status of hot recycled asphalt mixture at home and abroad, analyzes the aging mechanism and regeneration mechanism of asphalt, and summarizes the technical ways of asphalt recycling. The properties of RAP aggregate and old asphalt are studied, and the characteristics of gradation of used asphalt are analyzed. With the increase of aggregate particle size in RAP, the asphalt content in the old aggregate decreased. In the design of mixture ratio of recycled asphalt mixture, the mixing mode of used asphalt mixture is studied emphatically, and the grey correlation degree analysis method is used to analyze the dynamic stability of recycled asphalt mixture and the Marshall eigenvalue. The main factor affecting the rutting resistance of mixture is Marshall modulus. Based on the result of variation coefficient of Marshall modulus, the regeneration was studied by using the method of 1# mixing (4.75mm~9.5mm aggregate ratio was small and 9.5mm~13.2mm ratio was high). Finally, the high temperature performance and water stability of hot recycled asphalt mixture are verified. The high-temperature performance of hot-recycled asphalt mixture can be improved by adding used materials. With the increase of the amount of used materials, the dynamic stability of mixture and the ratio of freeze-thaw splitting strength are increasing first and then decreasing. In a certain range of admixtures, the addition of old materials is beneficial to the water stability of recycled asphalt mixtures, but the maximum amount of used materials should be controlled well. At last, the paper summarizes the construction technology of reclaimed asphalt pavement, and puts forward the suggestion of heating temperature control of new and old aggregate of recycled asphalt mixture.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414
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