摘要
掺纳米二氧化硅和钢纤维的超高韧性水泥基材料(UHTCC)具有良好的力学和耐高温性能。为探究UHTCC与钢筋在高温后的协同工作性能,文中对配光圆钢筋和变形钢筋的UHTCC试件在经历不同高温后的表观形态及拉拔试验中的滑移和破坏现象进行观察研究。试验表明:随经历温度的升高,UHTCC与钢筋的粘结应力逐渐降低;光圆钢筋的极限粘结应力和相应的滑移量呈负相关,UHTCC高温后疏松多孔,塑性变形能力加强,导致钢筋大滑移量的产生;变形钢筋与UHTCC的粘结应力显著大于光圆钢筋,两者粘结应力随经历温度升高具有相对不同的变化趋势。最后,文中提出了一个光圆钢筋粘结强度折减公式,与实验值符合较好。
The Ultra High Toughness Cementitious Composite（ UHTCC） adding nano-Si O2 and steel fiber has excellent mechanical properties and high temperature performance. To investigate the collaboration ability of UHTCC and steel bar,the paper did some study and observation on the surficial morphology and slip in pulling test after high temperature of reinforced UHTCC. The test indicates that： the bonding stress reduces with experienced temperature increases; the limit bonding stress of round bar has negative correlation with slip,and a considerable steel bar slippage occurs when UHTCC softened and deformation capacity strengthened because of the increase of interspace after high temperature; the bonding stress of deformed bars between UHTCC is significantly stronger than that of round bars,and the two bonding stresses have different trends with the increase of suffered high temperature. The paper proposed a stress strength reduction formula comply with the experimental data.
出处
《低温建筑技术》
2016年第4期1-3,13,共4页
Low Temperature Architecture Technology
基金
国家科技支撑计划课题(2012BAJ13B04)
关键词
超高韧性水泥基材料
高温后
粘结应力
ultra high toughness cementitious composite
after high temperature
bonding stress
