现场施工条件下老化温度对灌缝胶性能的影响  

Effect of Aging Temperature on Properties of Sealant under Field Construction Conditions

作　　者：刘汉超 滕新华 张菁燕 张凯华 林辉 LIU Hanchao;TENG Xinhua;ZHANG Jingyan;ZHANG Kaihua;LIN Hui(Changzhou Architectural Research Institute Group Co.,Ltd.,Changzhou,Jiangsu 213000,China)

机构地区：[1]常州市建筑科学研究院集团股份有限公司,江苏常州213000

出　　处：《中外公路》2024年第4期73-82,共10页Journal of China & Foreign Highway

基　　金：江苏省基础研究计划项目(编号:BK20200181)。

摘　　要：为研究短期老化温度对灌缝胶性能的影响,制备了灌缝胶,并模拟现场施工条件,对180~220℃下短期老化前后的灌缝胶性能进行测试,研究灌缝胶的黏弹性、物化特性与微观结构,对其性能变化的内在机制进行讨论。结果表明:老化后灌缝胶的锥入度、流动值降低,软化点、弹性恢复率升高,高温(>180℃)短时间和低温(160℃)长时间的老化均会造成较为明显的性能改变,而低温拉伸性能则并非随温度上升而单调降低。物化特性测试与微观结构表征结果显示:更高温度下老化的灌缝胶极性基团显著增加,组分玻璃化转变温度上升,储能模量升高;更高温度下制样的灌缝胶黏度更低,易渗入孔隙与黏结面形成机械锚固,同时,老化造成的极性升高会使其与黏结面产生更高的化学胶结力,进而提升黏结性能。然而,随着老化的不断加剧,灌缝胶黏度上升,黏结性能也会随之降低。因此,灌缝胶的综合性能并非随短期老化温度的上升而线性降低,而是其自身黏弹性及黏结性综合作用的结果。In order to study the influence of short-term aging temperature on the properties of sealant,a sealant was prepared,and field construction conditions were simulated.The properties of the sealant before and after short-term aging at 180‒220℃were tested.The viscoelastic properties,physicochemical properties,and microstructures of the sealant were studied,and the mechanism of property changes was discussed.The results show that the cone penetration and flow value of the aged sealant decrease,while the softening point and elastic recovery rate increase.Aging at high temperature(>180℃)for a short time and low temperature(160℃)for a long time will cause obvious property changes.The tensile properties under low temperatures do not decrease monotonically as the temperature increases.The results of the physicochemical property test and microstructure characterization show that the polar groups of the aged sealant at higher temperatures increase significantly,and the glass-transition temperature of the components increases.The storage modulus increases,while the sealant prepared at a higher temperature has a lower viscosity,which makes it much easier to penetrate into the pores at the bonding surface to form mechanical anchorage.Meanwhile,the increase in polarity due to aging generates a higher chemical interaction force with the bonding surface,thus improving the bonding performance.With ongoing aging,the viscosity of the sealant increases,and the bonding performance decreases.Therefore,the comprehensive properties of the sealant do not linearly decrease with the increase in short-term aging temperature but are affected by the viscoelasticity and bonding performance.

关 键 词：道路材料 灌缝胶 短期老化 黏弹性变化 物化特性分析 微观结构表征 黏度演变 温度效应 

分 类 号：U418.6[交通运输工程—道路与铁道工程]