摘要
采用立方体黏结劈拉试件研究活性粉末混凝土中钢纤维掺量、界面黏结方式、试件浇筑形式及普通混凝土强度等级对活性粉末混凝土-普通混凝土黏结劈拉性能的影响,分析两者之间的黏结机理。试验结果显示,活性粉末混凝土-普通混凝土界面黏结良好,破坏形式有黏结面破坏、黏结面破坏＋普通混凝土开裂及普通混凝土破裂3种;活性粉末混凝土中的钢纤维可提高界面粗糙度和机械咬合力,有阻裂抗裂作用,增加钢纤维掺量使黏结劈裂强度增大;以劈裂面作为黏结面能够提高活性粉末混凝土-普通混凝土黏结界面的粗糙度,黏结劈拉强度高于以自然面黏结的试件;水平浇筑的黏结劈拉强度值大于竖向浇筑,约为竖向浇筑的1.1~1.3倍;普通混凝土强度的提高使得黏结劈拉强度增大。
Specimens with dimension of 100 mm× 100 mm×100 mm were tested to investigate the influence of Reactive Powder Concrete（RPC） steel fiber content, interface treatment, pouring direction and strength of Normal Concrete （NC） on the splitting tensile bonding properties of RPC/NC, and to analyze bonding mecha- nism between the two. Experimental results showed that RPC/NC exhibited excellent bonding performance. Three failure modes included bonding interface failure, bonding interface failure with NC cracking and NC rup- ture. Steel fibers in RPC could enhance interracial roughness, improve mechanical interlocking between RPC and NC, and crack resistance. Splitting tensile bonding strength increased with the increase of steel fibers. The interracial roughness of RPC/NC was improved by using the cleaving surface as the bonding surface, resulting in higher splitting tensile bonding strength than that of the natural surface of the specimens. The splitting ten- sile bonding strength with horizontal pouring was greater than that with vertical pouring, about 1.1 ～ 1.3 times higher and increased with the increasing of NC strength.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2016年第3期127-132,共6页
Journal of the China Railway Society
基金
北京市博士后科研活动经费(2014ZZ-41)
国家自然科学基金(51278039)
关键词
活性粉末混凝土-普通混凝土黏结
黏结劈裂强度
黏结机理
界面粗糙度
bonding of reactive powder concrete and normal concrete
splitting tensile bonding strength
bond- ing mechanism
interracial roughness
