塑管混凝土界面透气性研究

Research on Gas Permeability of Pipe-concrete Interface in Plastic-pipe Confined Concrete

提出了一种基于压力时间衰减法测定塑管混凝土界面透气性的方法,并研究不同界面改善措施对塑管混凝土界面透气性的影响.研究结果表明:透气性试验具有较高的重复性和稳定性;塑管混凝土界面的透气性随HEA膨胀剂掺量的提高而降低;Preprufe胶带能明显改善塑管-混凝土界面的粘结性能,使压力衰减时间或抗渗性能提高了一个数量级.最后,拟合压力-时间衰减曲线,并提出了经验函数式.

A pressure-time recession method to measure the gas permeability of the pipe-concrete interface in Plastic-Pipe confined Concrete（PPC） was introduced,and then effects of some improving measures on the gas permeability of the pipe-concrete interface in PPC were investigated by this method.Results indicate that this method is of high repeatability and stability.The gas permeability decreases with the increase of the expansive agent.The Preprufe tape greatly improves the bonding property of the pipe-concrete interface,and therefore,the decay time of gas pressure or the gas impermeability is an order of magnitude higher than that of the controlling PPC.Fitting curves of the gas pressure-time recession were conducted and an empirical formula was proposed.