针对聚合物水泥复合填缝料(PCCJS)耐久性研究不足的问题,对经过60℃高温处理后的PCCJS进行定伸、拉伸和剪切试验,研究高温作用对PCCJS定伸粘结性能、力学性能的影响,不同高温作用时间(1d、7d、15d、30d)对PCCJS性能的影响规律。通过扫描电镜和压汞测孔试验,分析了高温环境对PCCJS性能影响的微观机制。结果表明:高温环境下,PCCJS内部的聚合物大分子降解断裂,分子间间隙变大,导致PCCJS拉伸力学性能和剪切力学性能下降,且随高温作用时间的延长而不断降低。PCCJS在60℃环境下作用15d后,尚未发生内聚破坏或粘结破坏,呈现出良好的定伸粘结性能。
In view of the insufficient research on the durability of polymer cement composite joint sealant(PCCJS),fixed extension,tensile and shear tests were carried out on PCCJS treated at 60℃.The effect of high temperature on the fixed-stretch bonding and mechanical properties of PCCJS,and the law of influence of different high temperature action time (1d,7d,15d,30d) on the properties of PCCJS were studied.Through scanning electron microscope and mercury intrusion test,the micro-mechanism of the influence of high temperature environment on the performance of PCCJS was analyzed.The research results shown that under high temperature,the polymer macromolecules inside the PCCJS degraded and breaked,and the intermolecular gap became larger,which leaded to the decrease of the tensile and shear mechanical properties of the PCCJS.And with the extension of high temperature action time,it will continue to decrease.The PCCJS had not undergone cohesive failure or bonding failure after 15 days of action at 60℃,showing good fixed-stretch bonding performance.
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基金资助
国家自然科学基金面上项目(51208507和51378497)
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