厂拌冷再生用乳化沥青性能及应用技术研究

发布时间：2018-04-22 09:07

本文选题：沥青乳化剂 + 乳化沥青　；参考：《西安科技大学》2017年硕士论文

【摘要】：乳化沥青可以常温下再生旧沥青路面材料,具有节省资源,减小环境污染等特点,是冷再生技术成功推广的关键材料。本文分析了沥青乳化原理、乳化沥青与集料的作用原理和乳化沥青冷再生混合料强度形成机理。懫用目前国内外常用的三种阳离子慢裂型和一种阳离子中裂型乳化剂制备乳化沥青并研宄了乳化沥青的各项技术指标,根据厂拌冷再生技术的特点,综合得出慢裂中凝型乳化沥青在该技术中的适用性;系统研究RAP材料特性,评价集料状况和沥青的老化程度,结合国内外常用配合比设计方法,确定冷再生混合料的设计级配;并基于振动压实试验确定了再生混合料的最佳含水量,按照干劈裂强度最大并兼顾湿劈裂强度和干湿劈裂强度比均较大的原则确定了再生混合料的最佳乳化沥青用量;蜡封法测混得合料的毛体积密度和空隙率,采用马歇尔击实方法制作试件,通过室内试验研宄四种乳化沥青冷再生混合料的力学性能;分别基于劈裂试验、车辙试验、无恻限抗压强度验研试宄了混合料的抗裂性、高温稳定性和7d无侧限抗压强度,按照冻融劈裂试验和马歇尔稳定度试验研究了混合料的抗水损害能力;在最佳含水量和最佳乳化沥青用量的条件下研究了水泥掺量对冷再生混合料路用性能的影响。通过对比四种冷再生混合料的各项指标,综合得出阳离子慢裂中凝型乳化沥青表现最优,从而确定了慢裂中凝型乳化沥青在厂拌冷再生技术中的适用性。根据不同水泥掺量下再生混合料性能的表现规律,兼顾强度、水稳定性、无侧限抗压强度较大及降低工程成本的原则,确定了水泥用量。论文最后通过分析乳化沥青的经济效益和社会效益,充分表现了乳化沥青应用于冷再生技术中具有的可观的经济价值和显著的环保价值。本文研宄结果可为选取厂拌冷再生工程用的乳化沥青提供参考,对深入研宄适合于厂拌冷再生技术的乳化沥青提供了试验依据。
[Abstract]:Emulsified asphalt can regenerate old asphalt pavement materials at room temperature, which has the characteristics of saving resources and reducing environmental pollution. It is the key material for the successful popularization of cold recycling technology. This paper analyzes the principle of asphalt emulsification, the action of emulsified asphalt and aggregate, and the forming mechanism of cold recycled asphalt mixture strength. The emulsified asphalt was prepared by using three cationic slow cracking type and one cationic intermediate cationic emulsifier, which are commonly used at home and abroad. Finally, the applicability of slow-cracking intermediate coagulant emulsified asphalt in this technology is obtained, the characteristics of RAP materials are systematically studied, the aggregate status and asphalt aging degree are evaluated, and the design gradation of cold recycled mixture is determined by combining the common design methods of mixture ratio at home and abroad. Based on the vibration compaction test, the optimum moisture content of recycled mixture was determined, and the optimum emulsified asphalt content was determined according to the principle of maximum dry splitting strength and greater wet and wet splitting strength ratio. The bulk density and void ratio of the mixture were measured by wax sealing method, and the mechanical properties of four kinds of cold recycled asphalt mixtures were studied by using Marshall compaction method, which were based on split test and rutting test, respectively. The crack resistance, high temperature stability and 7 days unconfined compressive strength of the mixture were studied. According to the freeze-thaw splitting test and Marshall stability test, the water damage resistance of the mixture was studied. The influence of cement content on the road performance of cold recycled mixture was studied under the conditions of optimum moisture content and the optimum amount of emulsified asphalt. By comparing each index of four kinds of cold recycled mixture, the optimum performance of cationic slow cracking intermediate coagulant emulsified asphalt is obtained, and the applicability of slow crack intermediate solidified emulsified asphalt in cold recycling technology is determined. According to the performance law of recycled mixture under different cement content, the principle of considering strength, water stability, high compressive strength without side limit and reducing project cost, the cement dosage is determined. Finally, by analyzing the economic and social benefits of emulsified asphalt, the paper fully shows the considerable economic value and significant environmental protection value of emulsified asphalt used in cold recycling technology. The results of this paper can provide a reference for the selection of emulsified asphalt for cold recycling engineering, and provide experimental basis for further study of emulsified asphalt suitable for cold recycling technology.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

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