（中国建筑科学研究院有限公司， 北京 100013）

［摘要］装配式结构存在大量的混凝土结合面，而结合面处混凝土的粘结强度与密实性均低于整体现浇混凝土，为研究混凝土结合面的抗渗性能，考虑现场后浇混凝土前结合面是否清理与是否洒水湿润等施工情况，设计制作了包括4种清理状况的混凝土叠合试件，再钻取芯样加工为混凝土抗渗试件，研究结合面清理状况对其抗渗性能的影响。试验结果表明：混凝土结合面是装配式结构抗渗性能的薄弱部位，按标准要求清理的结合面相对渗透系数为混凝土本体的7.2倍；结合面的清理质量会显著影响其抗渗性能，后浇混凝土前不清理结合面会使混凝土的抗渗性能大幅降低，其相对渗透系数最大可达混凝土本体的95.8倍；发现洒水湿润结合面反而会降低结合面的抗渗性能，可能由于结合面处积水造成混凝土孔隙率增大。不同清理质量下混凝土结合面的抗渗性能试验结果可为装配式结构的工程质量控制与耐久性评估提供参考依据。

［关键词］装配式结构； 混凝土； 结合面； 质量缺陷； 抗渗性能；工程质量控制；耐久性评估

中图分类号：TU528-1, TU374文献标识码：A文章编号：1002-848X(2020)09-0021-05

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Experimental study on impermeability performance of concrete interface in prefabricated structures

OUYANG Zhipeng, SUN Bin, WANG Ni, WU Mingya

(China Academy of Building Research, Beijing 100013, China)

Abstract:There are many concrete interfaces in prefabricated structures, but bond strength and compactness of concrete interface are lower than cast-in-place concrete. In order to study the impermeability performance of the concrete interface, considering whether the front interface of the post-pouring concrete was cleaned up and whether it was wet interface sprinkled with water, concrete composite specimens including 4 clean-up conditions were designed and manufactured. Core samples were then drilled and processed into concrete impermeability experimental specimens, and the influence of the interface cleaning status on its impermeability performance was studied. The experimental results show that the concrete interface is a weak part of the impermeability of the prefabricated structure. The relative permeability coefficient of the bonding interface cleaned according to the standard is  7.2 times that of the concrete body. The cleaning quality of the interface will significantly affect its impermeability performance. Failure to clean the interface before pouring the concrete will greatly reduce the impermeability performance of the concrete, and its relative permeability coefficient can be up to 95.8 times that of the concrete body. It is found that the wet interface sprinkled with water will reduce the impermeability performance of the interface, which may increase the porosity of the concrete due to the accumulation of water at the interface. The experimental results of the impermeability performance of the concrete interface under different cleaning qualities can provide a reference for the engineering quality control and durability evaluation of prefabricated structures.

Keywords:prefabricated structure; concrete; interface; quality defect; impermeability performance; engineering quality control; durability evaluation

*国家重点研发计划项目(2016YFC0701800)，住房和城乡建设部科技项目(2016-K5-043)，中国建筑科学研究院应用技术研究课题(20150112330730050)。

通讯作者：孙彬，博士，研究员，Email:sunbinmail@163.com。