【摘要】：聚合物改性瀝青是目前世界范圍內(nèi)研究較為成熟的技術(shù),其不僅能提高瀝青路面的高溫抗轍性,而且能賦予瀝青路面良好的綜合性能。利用廢舊聚合物材料制備改性瀝青,既節(jié)約石油資源,又能減少固廢對環(huán)境造成的壓力,具有重要意義。本文以70#重交道路瀝青為基質(zhì)瀝青,以廢舊多層共擠高分子膜(r-MCEPS)或回收聚乙烯(r-PE)為主要改性劑,有機(jī)納米蒙脫土(OMMT)、苯乙烯-丁二烯-苯乙烯(SBS)為輔助改性劑,通過高速剪切乳化技術(shù),制備復(fù)合改性瀝青,采用微觀相形態(tài)、流變性能和常規(guī)表征手段研究復(fù)合改性瀝青的結(jié)構(gòu)形態(tài)和路用性能。微觀相形態(tài)觀察結(jié)果表明：在瀝青中加入廢舊聚合物r-MCEPS或r-PE,體系呈現(xiàn)出典型的“海-島”結(jié)構(gòu),廢舊聚合物以顆粒和微絲狀分散在瀝青中,形成網(wǎng)絡(luò)結(jié)構(gòu)體系。常規(guī)性能和流變試驗結(jié)果則表明,無論r-MCEPS改性瀝青還是r-PE改性瀝青,儲存穩(wěn)定性都需要改善,但r-MCEPS改性瀝青的高溫性能要好于r-PE。所以選擇r-MCEPS作為瀝青改性材料,其最佳摻量為6phr。為改善r-MCEPS改性瀝青的儲存穩(wěn)定性,選擇OMMT作為輔助改性劑。實驗結(jié)果表明,r-MCEPS/OMMT復(fù)合改性瀝青儲存穩(wěn)定性均好于r-MCEPS改性瀝青。當(dāng)OMMT添加量為2.5phr時,r-MCEPS/OMMT復(fù)合改性瀝青綜合性能最好,但其儲能模量和TSHRP均低于r-MCEPS改性瀝青。最后,選擇SBS提高r-MCEPS/OMMT復(fù)合改性瀝青的儲能模量和TsHRP。研究結(jié)果表明,SBS提高了r-MCEPS/OMMT/SBS復(fù)合改性瀝青的儲能模量和TSHRP。當(dāng)SBS添加量在3phr時,體系網(wǎng)絡(luò)結(jié)構(gòu)最穩(wěn)定,綜合性能最佳。
[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.
【學(xué)位授予單位】：福建師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U414

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