环氧沥青混合料孔隙结构及渗透性能

Research on Pore Structure and Seepage Property of Thermosetting Resin Modified Asphalt Mixture

沥青混合料的水稳定性受到孔隙结构的影响,其渗透性能与路面水损害的产生和发展密不可分。通过冻融循环试验、工业CT扫描试验和压力渗水试验,分析环氧沥青混合料在冻融循环作用下的孔隙结构及渗水量变化规律。结果表明:冻融循环作用使得沥青混合料孔隙率增大,环氧沥青混合料孔隙率增大率远小于普通沥青混合料,且初始孔隙率越小孔隙率增大量越小;沥青混合料孔隙率的增加,主要依赖于500μm孔径以上孔隙体积的增大;在不同压力作用下,低孔隙率的环氧沥青混合料渗水量为零;相同孔隙率下,渗水量随压力增加而增长,并趋于稳定。孔隙结构与渗水量分析表明,环氧沥青混合料具有优良的抗水损害性能,小孔隙率的环氧沥青混合料水稳定性最佳。

The water stability of asphalt mixture has been affected by the pore structure,and its permeability is inseparable from the occurrence and development of pavement water damage.Being based on freeze-thaw cycle test,industrial CT scanning test and pressure water seepage test,in this paper,the pore structure and water seepage of thermosetting resin modified asphalt mixture under freeze-thaw cycle have been analyzed.The results have shown that the freeze-thaw cycles increase the porosity of the asphalt mixture,and the porosity increase rate of the thermosetting resin modified asphalt mixture is far less than that of the base asphalt mixture,and the smaller the initial porosity is,the smaller the increase of porosity is.The increase of porosity of asphalt mixture depends on the increase of the pore volume above 500μm pore size.Under different pressures,the water seepage of thermosetting asphalt mixture with low porosity is 0g;Under the same porosity,the water seepage volume increases with the increase of pressure and gradually Tend to be stable.The analysis on pore structure and water seepage shows that thermosetting resin modified asphalt mixture has excellent water damage resistance,and the water stability of thermosetting resin modified asphalt mixture with small porosity is the best.