基于层间粘结的高黏改性乳化沥青性能评价及应用

Performance Evaluation and Application of High-viscosity Modified Emulsified Asphalt Based on Interlayer Bonding

针对沥青路面层间粘结问题,以北京地区养护大修工程为依托,对研制的基于SBS改性沥青的高黏改性乳化沥青的层间粘结性能进行了评价,并与目前常用的PCR改性乳化沥青、PC-3乳化沥青及无粘层油情况进行了对比。结果表明:四种粘层材料的剪切强度、剪切强度比及拉拔强度大小顺序均为:高黏改性乳化沥青>PCR改性乳化沥青>PC-3乳化沥青>无粘层油;随乳化沥青用量增加,层间剪切强度均呈先增大后减小的变化趋势;拉拔强度和剪切强度均随温度升高呈快速减小趋势;高黏改性乳化沥青抗剪切强度在高温时接近混合料自身强度,具有良好的层间粘结性能。高黏改性乳化沥青已被成功应用在西长安街大修、三环路大修、石担路预防性养护等工程中,效果良好。

Aim at asphalt pavement interlayer bonding problem,maintenance and overhaul project in Beijing area as the backing,the interlayer bonding performance of high-viscosity modified emulsified asphalt(HVMEA),which is developed base on SBS modified emulsified asphalt,is evaluated,and comparatively investigate that performance of conventional PCR modified emulsified asphalt,PC-3 emulsified asphalt and no tack coat.The results show that the shear strength,shear strength ratio and drawing strength sequence of four materials is HVMEA>SBR modified emulsified asphalt>PC-3 emulsified asphalt>no tack coat.The shear strength all firstly increases and then decreases as emulsified asphalt increases.Shear strength and drawing strength reduces sharply with temperature increasing.The shear strength of HVMEA is approximately equal to its own mixture strength,which indicate that HVMEA has good interlayer bonding performance.The HVMEA has been successfully applied in west Chang’an Avenue overhaul project,Beijing’s Third Ring roads overhaul project,ShiDan Road preventive maintenance project,and the result is good.