温拌再生沥青混合料应用技术研究

发布时间：2019-06-03 19:38

【摘要】：温拌再生技术越来越受到重视，但是温拌再生技术中对旧沥青转移影响因素综合考虑的研究较少，国内外对温拌再生沥青混合料拌合顺序的研究成果不一致，并且国内大都在油石比相同时对不同旧料掺量下的路用性能展开研究。因此，本文致力于温拌技术中旧沥青转移时不同影响因素的研究，温拌再生沥青混合料拌合顺序的研究和不同旧料掺量对应的最佳油石比下的路用性能的研究。本文对旧沥青混合料中旧沥青转移程度开展研究时先确定试验条件，然后考虑不同的影响因素。首先研究不同的集料粒径对旧沥青转移程度的影响，发现集料粒径对旧沥青转移影响不大，其次是预热温度拌合时间和拌合温度对旧沥青转移程度的影响，确定出试验条件；然后是老化时间旧料掺量和粉胶比对旧沥青转移程度的影响；最后是再生剂温拌剂和旧料掺量对旧沥青转移程度的影响，找出不同影响因素对旧沥青转移的影响规律和影响程度，为后续配合比设计油石比的确定提供依据。对拌合顺序的研究采用宏观拌合顺序和国内外不同的沥青混合料拌合顺序2种方式。宏观拌合顺序不成型试件，用转移沥青量作为评价指标；混合料拌合顺序采用马歇尔方法击实成型试件，，以试件的物理力学指标作为评价依据，结果显示，2种方式试验结果一致，建议以后在拌合温拌再生混合料时采用国内规范规定的拌合顺序。确定不同旧料掺量的最佳油石比，在各最佳油石比下对混合料的路用性能进行研究，结果表明，随着旧料掺量的增多，热拌与温拌表现出来的规律不同，并确定出旧料最佳掺量为20%。
[Abstract]:More and more attention has been paid to warm mix recycling technology, but there are few studies on the influencing factors of old asphalt transfer in warm mix recycling technology, and the research results on the mixing sequence of warm mix recycled asphalt mixture are not consistent at home and abroad. And most of the domestic road performance under different old material content is studied when the oil-stone ratio is the same. Therefore, this paper focuses on the study of different influencing factors of old asphalt transfer in warm mixing technology, the study of mixing sequence of warm mix recycled asphalt mixture and the study of road performance under the optimum oil-stone ratio corresponding to different amount of old asphalt. In this paper, the test conditions are determined when the transfer degree of old asphalt in old asphalt mixture is studied, and then different influencing factors are considered. Firstly, the effect of different aggregate particle size on the transfer degree of old asphalt is studied, and it is found that the aggregate particle size has little effect on the transfer of old asphalt, followed by preheating temperature. The effects of mixing time and mixing temperature on the transfer degree of old asphalt were determined, and then the aging time was determined. The effect of the content of old material and the ratio of powder to glue on the transfer degree of old asphalt; finally, the regenerated agent? The influence of warm mixing agent and old material content on the transfer degree of old asphalt is found out, and the influence law and degree of different influencing factors on the transfer of old asphalt are found out, which provides the basis for the determination of oil-stone ratio in subsequent mix proportion design. The mixing sequence was studied by macro mixing sequence and different asphalt mixture mixing sequence at home and abroad. The macroscopical mixing sequence does not form the specimen, and the amount of transfer asphalt is used as the evaluation index. The mixing sequence of the mixture was compacted by Marshal method, and the physical and mechanical indexes of the specimens were used as the evaluation basis. The results showed that the test results of the two methods were consistent. It is suggested that the mixing sequence stipulated in the domestic specification should be adopted when mixing the recycled mixture with warm mix in the future. The optimum oil-stone ratio of different old materials was determined, and the road performance of the mixture was studied under the optimum oil-stone ratio. The results showed that with the increase of the old material content, the law of hot mixing and warm mixing was different. The optimum content of the old material was determined to be 20%.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：U414

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