老化对水性环氧树脂复合SBR改性乳化沥青粘弹性的影响

Influence of aging on viscoelasticity of waterborne epoxy resin compound SBR modified emulsified asphalt

普通乳化沥青用作沥青路面粘结料时,存在着粘结性差、耐久性差等缺点。为改善其性能,将水性环氧树脂(WER)与苯乙烯-丁二烯橡胶(SBR)混合,采用乳化法和改性法制备出了SBR+WER(SW)型高性能路面粘结料。为研究老化对水性环氧树脂复合SBR改性乳化沥青粘弹性的影响,选取了SBR改性乳化沥青作为对比。研究了SW型粘结料和SBR改性乳化沥青老化前后蒸发残留物的质量损失、针入度、软化点、延度和粘度,以及复数剪切模量、相角和车辙因子。结果表明:相比于SBR改性乳化沥青,SW型粘结料具有更好的抗老化性能,水性环氧树脂的加入使得SW型粘结料在老化作用下具有更稳定的低温变形能力,并且还改善了其高温抵抗变形能力和耐久性。

Ordinary emulsified asphalt has the defect of insufficient adhesion and durability when it is used as the asphalt pavement bonding layer material.To improve its performance,waterborne epoxy resin(WER)was mixed with styrene-butadiene rubber(SBR)to prepare a better-performance pavement bonding material,SBR+WER(SW)through the method of modification and emulsification.The objective of this paper is to investigate the influence of aging on the viscoelasticity of the waterborne epoxy resin compound SBR modified emulsified asphalt.The SBR modified emulsified asphalt was chosen as the comparison bonding material.The mass loss,penetration,softening point,ductility and viscosity,as well as the complex shear modulus,phase angle and rutting factor of the evaporation residue samples of the SW and SBR modified emulsified asphalt before and after aging were investigated.The results show that the SW bonding material possessed better aging resistance than the SBR modified emulsified asphalt.The addition of waterborne epoxy resin enabled the SW bonding material to have more stable low-temperature deformation capacity under the aging effect,and improved its high-temperature deformation resistance and durability as well.