钢筋混凝土水池壁板水平施工缝抗渗性能试验研究  

Impermeability of Reinforced Concrete Tank Wall with Horizontal Construction Joints

作　　者：李晓帆 张爽 周仲煜 周知 黄维[1] LI Xiaofan;ZHANG Shuang;ZHOU Zhongyu;ZHOU Zhi;HUANG Wei(Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics(Wuhan University of Technology),Wuhan 430070,China;China Construction Third Bureau First Engineering Co.,Ltd.,Wuhan 430040,China;Department of Road and Bridge Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]新材料力学理论与应用湖北省重点实验室(武汉理工大学),武汉430070 [2]中建三局第一建设工程有限责任公司,武汉430040 [3]武汉理工大学道路与桥梁工程系,武汉430070

出　　处：《硅酸盐通报》2024年第9期3224-3234,共11页Bulletin of the Chinese Ceramic Society

基　　金：新材料力学理论与应用湖北省重点实验室开放基金(WUT-TAM202105)。

摘　　要：钢筋混凝土水池壁板因混凝土浇筑施工间断形成水平施工缝,造成新旧混凝土无法形成良好连接,在高水压作用下易出现渗漏。本文对不同混凝土材料及模拟水平施工缝试块进行了抗渗试验,对比分析了其抗渗性能,试验结果表明,添加聚丙烯纤维和内掺水泥基渗透结晶防水材料均能一定程度提高混凝土抗渗性能,而施工缝处的抗渗性能远低于混凝土自防水性能,对水平施工缝迎水面涂抹水泥基渗透结晶防水材料能有效提高该处的抗渗性能。对2片比例为1∶2的缩尺钢筋混凝土水池壁板进行了一次成型和考虑施工缝的二次成型局部渗透性能试验,试验结果表明,施工缝处混凝土因浇筑、振捣和养护不充分,池壁容易形成贯通裂缝,难以达到混凝土自防水目标要求。采用改性混凝土材料及在相关部位进行表面处理,能有效提高关键部位抗渗性能,进而提高整体抗渗性能。采用BP神经网络,建立了混凝土抗渗性能与其材料参数和施工工艺之间的非线性预测模型。In reinforced concrete(RC) tank walls,a horizontal construction joint exists because of the interruption of concrete casting,resulting in the old and new concrete not forming a reliable connection.The tank walls are prone to experiencing seepage under high hydrostatic pressure.In this paper,the permeability test of concrete with different mix proportion and simulated horizontal construction joints was first conducted.Their seepage behavior was investigated.The test results show that the addition of polypropylene fibers and cementitious capillary crystalline waterproofing materials(CCCW) can improve the impermeability of concrete.The impermeability at the construction joint is much lower than that of single-casting concrete.Moreover,applying CCCW to the water-facing surface of the construction joint can significantly enhance its impermeability.Then,two 1 ∶2 scaled RC tank wall specimens were tested for local permeability performance of single-casting and double-layer casting considering construction joints.The experimental results show that the RC tank wall with construction joint is prone to generate initial defects and seepage due to inadequate pouring,vibration,and curing of the concrete at the construction joints,making it difficult to achieve the design watertight requirements.The use of modified concrete materials and surface treatment in the relevant part can effectively improve the impermeability of the local construction joint,and further enhance the impermeability of RC tank walls.Finally,the BP neural network was used to establish a nonlinear prediction model between the impermeability of concrete and its material parameters and construction technology.

关 键 词：钢筋混凝土水池壁板 水平施工缝 改性混凝土 抗渗性能 BP神经网络 

分 类 号：TU375[建筑科学—结构工程]