复合改性沥青密封胶的组成优化及性能研究  

Research on Composition Optimization and Performance of Composite Modified Asphalt Sealant

作　　者：夏慧芸[1] 杨浩田 卢昌杰 宋莉芳[1] 牛艳辉 XIA Huiyun;YANG Haotian;LU Changjie;SONG Lifang;NIU Yanhui(College of Materials Science and Engineering,Chang’an University,Xi’an 710064,Shaanxi,China)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710064

出　　处：《华南理工大学学报（自然科学版）》2023年第6期136-145,共10页Journal of South China University of Technology(Natural Science Edition)

基　　金：浙江省交通厅科技项目(2021012);长安大学中央高校基本科研业务费专项资金资助项目(300102310301,300102311404)。

摘　　要：改性沥青类密封胶修补效果优异、生产成本较低,已被广泛应用于裂缝修补,但仍存在黏结性、柔韧性和耐久性不足的问题。热塑性硫化硅橡胶(TPSiV)兼具有硅橡胶结构稳定、耐候性佳和热塑性聚氨酯高强度、高弹性等优势,表现出优异的黏结性、耐久性、柔韧性以及高低温稳定性。本研究以90#基质沥青为主要原料,首先采用糠醛抽出油(FEO)对TPSiV进行预溶胀处理,再采用高速剪切法,通过添加苯乙烯-丁二烯-苯乙烯(SBS)、废旧胶粉(CR)、CaCO_(3)等改性剂,制备得到一系列高效复合改性沥青密封胶。系统研究SBS、TPSiV、CR掺量和CR粒径对改性沥青密封胶各项性能的影响,最终通过密封胶全套的路用指标对配方进行验证。采用软化点差值法表征了该密封胶的热储存稳定性,用荧光显微镜和扫描电子显微镜观察了TPSiV和TPSiV改性沥青的微观结构,采用傅里叶红外光谱(FTIR)对沥青改性前后的红外光谱进行了表征。结果表明:SBS掺量的增大显著提高了其高温性能,推荐掺量为3%;TPSiV提高了密封胶的柔韧性和粘结性,最佳掺量为3%;随着CR粒径减小,高温性能提高,低温性能下降,选择40目作为最佳粒径;随着CR掺量增加,改性沥青高温性能得到改善,最佳掺量为22%。该密封胶最佳配方SBS∶TPSiV∶CR∶CaCO_(3)∶FEO质量比5∶3∶22∶5∶3,满足储存稳定性要求;TPSiV具有粗糙的表面结构,表面附着有硅橡胶微粒,有利于后期与沥青粘附,且TPSiV在复合改性沥青中分散均匀,TPSiV复合改性沥青中化学改性和物理改性同时存在。Modified asphalt sealant has excellent repair effect and low production cost,and has been widely used in crack repair,but there are still problems such as insufficient adhesion,low flexibility and low durability.Thermo⁃plastic vulcanized silicone(TPSiV)has the advantages of silicone rubber such as stable structure,good weather re⁃sistance,high strength and high elasticity of thermoplastic polyurethane,showing excellent adhesion,durability,flexibility and high and low-temperature stability.In this study,90#matrix asphalt was used as the main raw mate⁃rial.Firstly,furfural extraction oil(FEO)was used to pre-swelling TPSiV,and then high-speed shear method was used to prepare a series of high efficiency composite modified asphalt sealant by adding styrene-butadiene-styrene(SBS),waste rubber powder(CR),CaCO3 and other modifiers.The effects of SBS,TPSiV,CR content and CR par⁃ticle size on the properties of modified asphalt sealant were systematically studied.Finally,the formula was verified through the indicators of the whole set of sealant.The thermal storage stability of the sealant was characterized by softening point difference method.The microstructure of TPSiV and TPSiV modified asphalt was observed by fluo⁃rescence microscope and scanning electron microscope.The IR spectra of asphalt before and after modification were characterized by Fourier infrared spectroscopy(FTIR).The results show that the increase of SBS content sig⁃nificantly improves its high temperature performance,and the best dosage is 3%.TPSiV improves the flexibility and cohesiveness of sealant,and the best dosage is 3%.With the decrease of CR particle size,the high-temperature performance is improved,while the low-temperature performance is decreased.The optimal particle size is 40 mesh.With the increase of CR content,the high-temperature performance of modified asphalt is improved,and the best dosage is 22%.The best sealant formula SBS∶TPSiV∶CR∶CaCO3∶FEO mass ratio is 5∶3∶22∶5∶3,which meets the requirements of storage

关 键 词：热塑性硫化硅橡胶 沥青密封胶 道路裂缝 热储存稳定性 低温性能 

分 类 号：TU533[建筑科学—建筑技术科学]