废胶粉/再生聚乙烯/再生聚丙烯功能化复合改性沥青及其混合料性能研究  

Study on properties of waste tire ground/recycled polyethylene/recycled polypropylene⁃modified asphalt and its mixtures

作　　者：张宏宇 ZHANG Hongyu(Shanxi Transportation Construction Engineering Quality Detection Center(Co,Ltd.),Taiyuan,030032,China)

机构地区：[1]山西省交通建设工程质量检测中心(有限公司),太原030032

出　　处：《中国塑料》2024年第10期91-96,共6页China Plastics

摘　　要：废胶粉(wTG)、再生聚乙烯(rPE)及再生聚丙烯(rPP)是产量较多的废旧聚合物材料,将其应用于交通建设中,不仅可以降低其对环境的污染而且在一定程度上可以改善沥青路面的使用性能。基于此,本文通过在基体配方m(rPE)∶m(rPP)=3∶2中添加不同含量wTG制备三元共混改性剂(TM),重点研究和分析了TM对改性沥青及其混合料(AC⁃13)性能影响。结果表明,随着wTG含量的增加,TM改性沥青软化点增加、针入度降低,而延度则出现最大值,并通过傅里叶变换红外光谱(FTIR)、微观形貌对改性机理进行分析评价。另外,随着wTG含量的增加,TM改性沥青混合料动稳定度存在先快速增加后增速放缓的变化趋势。对于低温抗裂性能、水稳定性性能(冻融劈裂强度比)及抗渗水性能方面,则均呈现先增加后下降的趋势。综合分析得出,在本实验条件下,建议20%的wTG含量有利于整体改善AC⁃13改性沥青混合料性能,这为今后工程应用提供重要的理论依据。Waste tire ground(wTG),recycled polyethylene(rPE),and recycled polypropylene(rPP)are typical waste polymeric materials with large output.The applications of these waste materials in traffic construction not only can reduce their pollution to the environment but also improve the performance of asphalt pavement to a certain extent.In this sense,a ternary blending modifier(TM)was prepared by incorporating different amounts of wTG into the matrix of rPE and rPP at a mass ratio of 3/2.The effect of TM on the properties of modified asphalts and its mixtures(AC⁃13)was investigated.The experimental results indicated that the softening point of the TM⁃modified asphalts increased with an increase in the wTG content,but their penetration degree tended to decrease.Nevertheless,their ductility reached a maximum.The modification mechanism was analyzed by FTIR and microtopography.Furthermore,the high⁃temperature stability,low⁃temperature cracking resistance,water stability,and water permeability performance of the AC⁃13 modified asphalt mixtures with different contents of wTG were investigated.The results indicated that with an increase in the wTG content,the modified asphalt mixtures presented a rapid increase in the dynamic stability at first,and then the incremental rate tended to decrease.However,their low⁃temperature cracking resistance,water stability(freeze⁃thaw splitting strength ratio),and water permeability resistance showed an increasing trend at first and then tended to decrease.In conclusion,the addition of 20%wTG facilitates to improve the performance of the AC⁃13 modified asphalt mixtures under current experimental conditions.This study provides an important theoretical basis for the future engineering applications of this type of modified asphalt mixtures.

关 键 词：废胶粉 再生聚乙烯 再生聚丙烯 沥青 性能 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]