不同交联度环氧沥青混合料低温弯曲性能研究

采用交联度分别为75.3%,71.4%,67.3%和58.4%的环氧沥青混合料进行-20℃,-10℃,0℃,10℃温度下小梁三点弯曲性能试验,构建了混合料弯曲强度、弯曲模量、弯曲破坏应变及弯曲应变能密度与温度、交联度的关系方程。结果表明：不同交联度的环氧沥青混合料弯曲强度与模量随着温度的提高而降低,弯曲破坏应变与弯曲应变能密度随着温度的提高而增大;不同交联度的环氧沥青混合料弯曲强度、弯曲模量、弯曲破坏应变及弯曲应变能密度与温度关系基本一致,各弯曲性能参数的温度敏感区间基本相同;温度敏感区间弯曲性能参数变化幅度较大,低于温度敏感区间,则弯曲性能参数变化幅度较小;环氧沥青混合料低温弯曲性能参数与温度、交联度之间具有较好相关性,提出的回归方程可以用于混合料低温弯曲性能预测。

Research on Bending Performances of Epoxy Resin Asphalt Mixes with Different Crosslink Densities at Low Temperatures

Three-point bending performance tests of epoxy resin asphalt mixes with four kinds of crosslink densities 75.3%,71.4%,67.3% and 58.4% were performed at-20 ℃,-10 ℃,0 ℃ and 10 ℃.Equations among bending strength,bending modulus,bending destroy deformation,bending strain energy density,temperatures and crosslink density of epoxy resin asphalt were conducted.Results show that bending strength and bending modulus of epoxy resin asphalt mixes with different crosslink densities decrease and bending destroy deformation and bending strain energy density increase with increase of temperature.Relationships of bending strength,modulus,bending destroy deformation,bending strain energy density and temperatures are identical.Temperature sensitivity regions of bending performance parameters are also identical.Variational amplitudes of bending performance parameters in temperature sensitivity regions change a lot and those change a little below temperature sensitivity regions.Bending performance parameters of epoxy resin asphalt mixes at low temperatures which can be used to predict bending performances of mixes at low temperatures have good relativity with temperature and crosslink density.