短期养生环氧固化行为及混合料性能

Research on Curing Behavior and Mixing Performance of Short-term Curing Epoxy Resin

为了缩短环氧沥青钢桥面铺装结构的养生时间,达到快速开放交通的目的,对一种自制短期养生环氧树脂结合料及其环氧沥青混合料进行研究。通过傅立叶红外光谱仪、差示扫描量热仪和荧光显微镜研究短期养生环氧树脂的固化行为,通过马歇尔稳定度评价其混合料强度增长情况,通过室内路用性能试验评价其混合料性能。结果显示:环氧树脂结合料固化后特征官能团消失,固化反应完全;其固化过程为自催化反应,升温速率越高固化热越小;实验室固化温度为60℃,在此温度下固化72h后,体系产生交联网络结构;短期养生环氧沥青混合料常温固化96h达到开放交通要求;室内试验马歇尔稳定度可达72kN,浸水残留稳定度比和冻融劈裂强度比均大于95%,70℃车辙动稳定度高达53000次/mm,最大弯拉应变高于规范指标29%且抗拉强度可达26.7MPa。

In order to shorten the curing time of epoxy asphalt steel bridge deck pavement structure and achieve the purpose of opening to traffic quickly,in this paper a self-developed short-term curing epoxy resin binder and its epoxy asphalt mixture are studied.The curing behavior of short-term curing epoxy is studied by Fourier transform infrared spectrometer,differential scanning calorimeter and fluorescence microscope,the strength growth of the mixture is evaluated by Marshall stability,and the performance is evaluated by road performance test.The results show that:after curing,the characteristic functional groups disappear and the curing reaction is complete.The curing process is autocatalytic,the higher rate of the temperature rise,the lower of the curing heat,and the laboratory curing temperature is 60℃.The point-line-cross linking network structure occurs in the system after curing for 72 hunder this temperature.The short-term curing epoxy asphalt mixture can meet the requirements of opening-to-traffic at room temperature for 96 h.Marshall stability is up to 72 kN under laboratory conditions.The stability ratio of immersion residue and freeze-thaw split strength ratio are both greater than 95%.The rut stability is up to53000 times/mm at 70℃.The maximum flexural-tensile strain is 29%higher than the code value and the tensile strength is up to 26.7 MPa.