防水粘结层材料复合件耐久性能评价

Evaluation on durable performance of waterproof bonding layer material composite parts

选取3种常用的防水粘结层材料,分析了干湿和冻融循环次数对复合件拉拔强度的影响。结果发现:随着干湿循环和冻融循环次数增加,不同粘结层材料的复合件拉拔强度均降低;干湿循环条件下水性环氧沥青的复合件拉拔强度降低程度明显小于高粘乳化沥青和SBS改性沥青,冻融循环条件下则相反,同时复合件拉拔强度恢复程度同样远低于高粘乳化沥青和SBS改性沥青;高粘乳化沥青和SBS改性沥青经历150000次疲劳循环加载后,复合件残余拉拔强度均高于水性环氧沥青,水性环氧沥青在50000次后,复合件残余拉拔强度明显降低;疲劳循环加载导致沥青发生不同程度的老化,其中水性环氧沥青针入度和软化点变化程度最小。

Three kinds of commonly used waterproof bonding layer materials were selected to analyze the influence of the number of dry-wet and freeze-thaw cycles on the drawing strength of composite parts.The test results show that the drawing strength of composites with different bonding layers were further reduced,with the increase of dry-wet cycle and freeze-thaw cycle.Under the condition of dry-wet cycle,the reduce degree of drawing strength of composite parts of waterborne epoxy asphalt is significantly lower than that of high viscosity emulsified asphalt and SBS modified asphalt;the tests showed the opposite under freeze-thaw cycle;meanwhile,the recovery degree of composite drawing strength was also much lower.After 150000 times of fatigue cyclic loading,the residual drawing strength of composite of high viscosity emulsified asphalt and SBS modified asphalt were higher than that of waterborne epoxy asphalt.After 50000 times,the residual drawing strength of composite of waterborne epoxy asphalt decreased significantly.Due to fatigue cyclic loading,different degrees of aging occurred in asphalt,and the degree of penetration and softening point of waterborne epoxy asphalt changed the least.