彩色超薄罩面的制备与性能研究

Preparation and performance of the color ultra-thin overlay

为保证超薄罩面在达到预防性养护目的同时又具有降温功效,通过在胶结料中掺入水性环氧树脂和在集料中掺入氧化铁红,并用耐磨性更好的金刚砂替代细集料,制备彩色超薄罩面。通过降温试验确定水性环氧树脂和氧化铁红掺量;根据湿轮磨耗试验和负荷轮粘附砂试验确定最佳胶结料用量;并通过室外降温试验和路用性能试验综合评价彩色超薄罩面的性能。结果表明,水性环氧树脂可以降低路面温度,水性环氧树脂也可以降低磨耗值和粘附砂量,氧化铁红可以增大降温幅度,三者的最佳掺量依次为40%,6.5%和3%。另外,水性环氧树脂能提高彩色超薄罩面的路用性能,但氧化铁红则略有不利影响。总之,彩色超薄罩面可以降温、密水并提高路用性能,可用于公路预防性养护工程。

To ensure the ultra-thin asphalt overlay not only is the preventive maintenance layer but also has the cooling effect,a color ultra-thin asphalt overlay was prepared in this study.In the color ultra-thin overlay,the waterborne epoxy resin was added into the binder,the iron oxide red was mixed with the aggregate,and the fine aggregate was replaced by the emery with better wearing resistance.First,the optimum blending amount of waterborne epoxy resin and the iron oxide red was determined through outdoor cooling test.According to the wet track abrasion test(WTAT)and the load wheel test(LWT),the optimum binder content was confirmed.Finally,the performance of the colored ultra-thin asphalt overlay was comprehensively evaluated by the outdoor cooling test and the pavement performance test.The results show that the binder was increased and the pavement temperature was decreased by the waterborne epoxy resin.The WTAT value and LWT value could both be reduced by the addition of waterborne epoxy resin.The temperature drop was increased with the addition of iron oxide red.The optimum content of the waterborne epoxy resin,iron oxide red and binder content for the color ultra-thin overlay,were 40%,6.5%and 3.0%.The temperature drop of each layer of the pavement was increased by more than100%under this dosage.Moreover,the pavement performance of the color ultra-thin asphalt overlay could be improved by the waterborne epoxy resin while decreased a little bit by the iron oxide red.In short,the color ultra-thin asphalt overlay prepared here can reduce the pavement temperature,keep the pavement from water seepage and improve pavement performance.It can be applied to highway pavement preventive maintenance engineering.