废旧多层共挤高分子膜改性沥青的制备与应用性能研究

发布时间：2018-07-14 17:18

【摘要】：聚合物改性沥青是目前世界范围内研究较为成熟的技术,其不仅能提高沥青路面的高温抗辙性,而且能赋予沥青路面良好的综合性能。利用废旧聚合物材料制备改性沥青,既节约石油资源,又能减少固废对环境造成的压力,具有重要意义。本文以70#重交道路沥青为基质沥青,以废旧多层共挤高分子膜(r-MCEPS)或回收聚乙烯(r-PE)为主要改性剂,有机纳米蒙脱土(OMMT)、苯乙烯-丁二烯-苯乙烯(SBS)为辅助改性剂,通过高速剪切乳化技术,制备复合改性沥青,采用微观相形态、流变性能和常规表征手段研究复合改性沥青的结构形态和路用性能。微观相形态观察结果表明：在沥青中加入废旧聚合物r-MCEPS或r-PE,体系呈现出典型的“海-岛”结构,废旧聚合物以颗粒和微丝状分散在沥青中,形成网络结构体系。常规性能和流变试验结果则表明,无论r-MCEPS改性沥青还是r-PE改性沥青,储存稳定性都需要改善,但r-MCEPS改性沥青的高温性能要好于r-PE。所以选择r-MCEPS作为沥青改性材料,其最佳掺量为6phr。为改善r-MCEPS改性沥青的储存稳定性,选择OMMT作为辅助改性剂。实验结果表明,r-MCEPS/OMMT复合改性沥青储存稳定性均好于r-MCEPS改性沥青。当OMMT添加量为2.5phr时,r-MCEPS/OMMT复合改性沥青综合性能最好,但其储能模量和TSHRP均低于r-MCEPS改性沥青。最后,选择SBS提高r-MCEPS/OMMT复合改性沥青的储能模量和TsHRP。研究结果表明,SBS提高了r-MCEPS/OMMT/SBS复合改性沥青的储能模量和TSHRP。当SBS添加量在3phr时,体系网络结构最稳定,综合性能最佳。
[Abstract]:Polymer modified asphalt is a mature technology in the world. It can not only improve the rutting resistance of asphalt pavement at high temperature, but also give the asphalt pavement a good comprehensive performance. It is of great significance to prepare modified asphalt by using waste polymer materials to save petroleum resources and reduce environmental pressure caused by solid waste. In this paper, 70# heavy cross road asphalt was used as base asphalt, waste multilayer co-extruded polymer membrane (r-MCEPS) or recycled polyethylene (r-PE) as main modifier, organic nano-montmorillonite (OMMT), styrene-butadiene-styrene (SBS) as auxiliary modifier. The composite modified asphalt was prepared by high speed shear emulsification technology. The microstructure and road performance of composite modified asphalt were studied by means of microstructure, rheological properties and conventional characterization. The results of microscopic phase morphology observation show that when the waste polymer r-MCEPS or r-PEis is added to the asphalt, the system presents a typical "sea-island" structure, and the waste polymer is dispersed in the asphalt in the form of particles and microfilaments, forming a network structure system. The results of conventional properties and rheological tests show that the storage stability of r-MCEPS modified asphalt and r-PE modified asphalt need to be improved, but the high temperature performance of r-MCEPS modified asphalt is better than that of r-PE. Therefore, r-MCEPS is chosen as the modified asphalt material, and the optimum content is 6 phr. In order to improve the storage stability of r-MCEPS modified asphalt, OMMT was selected as auxiliary modifier. The results show that the storage stability of r-MCEPS / OMMT modified asphalt is better than that of r-MCEPS modified asphalt. When the content of OMMT is 2.5phr, the composite modified asphalt has the best comprehensive performance, but its energy storage modulus and TSHRP are lower than that of r-MCEPS modified asphalt. Finally, SBS was chosen to improve the energy storage modulus and TsHRP of r-MCEPS- OMMT composite modified asphalt. The results show that SBS improves the storage modulus and TSHRPof r-MCEPS- / OMMT / SBS composite modified asphalt. When the amount of 3phr is added, the network structure is the most stable and the comprehensive performance is the best.
【学位授予单位】：福建师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

【参考文献】