混凝土露骨料处理结合面压剪承载力试验研究  

Experimental Research on Compression-Shear Bearing Capacity of Concrete Exposed Aggregate Treated Bond Surfaces

作　　者：姜国永 黄选明 张新江 王景贤 张宁 JIANG Guoyong;HUANG Xuanming;ZHANG Xinjiang;WANG Jingxian;ZHANG Ning(China Academy of Building Research,National Engineering Research Center of Building Technology,Beijing 100013,China;Beijing University of Technology,Beijing 100124,China;Beijing Yugou Precast Concrete Engineering,Beijing 100070,China)

机构地区：[1]中国建筑科学研究院有限公司,国家建筑工程技术研究中心,北京100013 [2]北京工业大学,北京100124 [3]北京榆构有限公司,北京100070

出　　处：《工业建筑》2023年第4期148-153,61,共7页Industrial Construction

基　　金：中国建筑科学研究院有限公司Ⅲ类科研项目(20190112470730019)。

摘　　要：为研究结合面露骨料处理对混凝土试件压剪承载力的影响,设计了120个结合面露骨料处理试件和30个整浇试件。基于激光扫描技术获取结合面形貌信息,通过编程运算得到其粗糙度表征参数;采用自主设计的抗剪试验夹具进行压剪承载力试验,得到露骨料处理下不同粗糙度混凝土结合面内聚力、内摩擦角等压剪承载力参数的变化规律。结果表明:对结合面进行适当露骨料处理,可以提高试件压剪强度,但过度处理会降低其压剪强度;基于激光扫描技术得到的二维粗糙度参数,可以用来表征露骨料试件压剪强度;提高后浇层混凝土强度,试件压剪承载力参数未得到显著提高;露骨料试件压剪承载力参数与整浇试件相比有一定差距,结合面露骨料处理工艺尚无法完全达到等同整浇的要求。In order to study the effect of exposed aggregate treatment on the compression-shear bearing capacity of concrete specimens,120 specimens with exposed aggregate treatment on the joint surface and 30 whole cast specimens were designed.Based on the laser scanning technology to obtain the bond surface morphology information,the roughness characterization parameters were obtained through programming;the shear test fixture designed independently was used to carry out the compression-shear load capacity test,and the change law of compressionshear bearing capacity parameters such as cohesion and internal friction angle of concrete bond surface with different roughness under the treatment of exposed aggregates was obtained.The results showed that the shear strength of the specimen could be improved by proper treatment of exposed aggregate on the joint surface,but excessive treatment would reduce its shear strength;the two-dimensional roughness parameters obtained based on laser scanning technology could be used to characterize the shear strength of the exposed aggregate specimen;the parameters of shear bearing capacity of the specimen were not significantly improved by increasing the strength of the post-casting concrete layer;the parameters of shear bearing capacity of the exposed aggregate specimen were somewhat different from those of the one-piece casting specimen,and the treatment process of the exposed aggregate on the joint surface could not fully meet the requirements equivalent to the one-piece casting yet.

关 键 词：结合面 粗糙度 露骨料处理 压剪承载力 激光扫描 试验研究 

分 类 号：TU528[建筑科学—建筑技术科学]