九江长江大桥防锈粘结层粘结性能试验研究

Experimental Study on Bonding Performance of Antirust Adhesive Layer of Jiujiang Yangtze River Bridge

为研究钢桥面铺装中防锈粘结层对热拌环氧沥青混合料施工工艺的适应能力,以九江长江大桥结构改造工程中使用的“环氧富锌漆+环氧粘层油”防锈粘结体系为研究对象,设计分步检测试验,以高温处理前后防锈粘结层的拉拔能力变化程度为指标,验证钢桥面铺装防锈粘结层的耐高温性能;以“钢板-防锈粘结层-铺装层”体系的剪切强度与拉拔强度为指标,研究环氧黏层油用量对粘结层性能的影响;通过多次浸水试验模拟,探讨粘结剂在受到水损害后力学性能的劣化规律。试验结果表明“环氧富锌漆+环氧粘层油”防锈粘结体系具有良好的抵抗高温作用的能力,可以满足热拌环氧沥青混合料的施工要求;当环氧黏层油用量在0.4~0.6 L/m 2时,其粘结性能较好;在浸水环境下,粘结层的剪切强度与拉拔强度均有所下降,在浸水初期,下降幅度最大。

In order to study the adaptability of antirust adhesive layer in steel bridge deck pavement to the construction technology of hot mix epoxy asphalt mixture,the antirust bonding system of"epoxy zinc rich paint+epoxy adhesive layer oil"used in the structural transformation project of Jiujiang Yangtze River Bridge is taken as the research object.The step-by-step detection test is designed to verify the steel bridge deck pavement by taking the change degree of the antirust adhesive layer before and after high temperature treatment as the index Based on the shear strength and pull-out strength of"steel plate antirust adhesive layer pavement"system,the influence of epoxy adhesive oil content on the performance of adhesive layer was studied;the degradation law of mechanical properties of adhesive after water damage was discussed through multiple immersion test simulation.The test results show that the antirust adhesive system of"epoxy zinc rich paint+epoxy tack coat oil"has good resistance to high temperature,and can meet the construction requirements of hot mix epoxy asphalt mixture;when the amount of epoxy tack coat oil is between 0.4 and 0.6 L/m 2,it can meet the construction requirements of hot mix epoxy asphalt mixture In the immersion environment,the shear strength and pull-out strength of the adhesive layer decrease,and the decrease range is the largest at the initial stage of immersion.