橡胶沥青防水粘结层层间抗剪性能试验分析

Test Analysis on Shear Resistance Performance between Rubber Asphalt Waterproofing Adhesive Layers

利用室内剪切试验模拟水泥混凝土桥面防水粘结层的界面受力状态,从沥青喷涂量、碎石撒布类型、桥面板界面处理状况、环境温度等方面系统分析影响其层间抗剪性能的各种因素及变化规律,以此提出提高橡胶沥青防水粘结层层间抗剪性能的各项技术措施,为充分发挥橡胶沥青防水粘结层的层间抗剪性能,必须严格控制其在高温状态下的抗剪和粘结性能,喷洒量和喷洒温度应控制在1.8～2.2kg/m2和190～200℃,同时,撒布粒径为2.36～4.75mm、撒布量为10kg/m2左右且经过预热处理的洁净碎石,而且,还应将桥面板的表面粗糙程度控制在合理的范围内,当抗滑摆值在45～55之间时,其层间抗剪强度出现最大值.

Based on the indoor shear test stimulation of the interface bonding force status of concrete bridge deck waterproof layers, conduct systematically analysis of various factors and rules in layer shear resistance, in terms of asphalt spray amount, gravel spreading type, bridge panel interface treatment conditions and environmental temperature, etc, to propose various technical measures for improving the shear resistance performance between rubber asphalt waterproofing adhesive layers thus provide experimental basis and data support for the practical applications and construction quality. Re- search concludes that： in order to give full play to the shear resistance performance between rubber as- phalt waterproofing adhesive layers, the shear resistance and bond performance in high temperature state must be strictly controlled, the spray volume and spray temperature should be controlled at 1.8 -2.2 kg/m2 and 190-200 ℃; meanwhile, the spreading gravels should be clean with preheating treatment, the diameter ranging from 2.36mm to 4.75 mm; the spraying volume should be 10 kg/m2. In addition, the bridge panel surface roughness degree should be controlled within a reasonable con- text, when the anti-sliding value is between 45 to 55, the maximum value of interlayer shear resist- ance strength appears.