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AN EXPERIMENTAL STUDY ON THE BOND BEHAVIOR BETWEEN STEEL BAR AND FROZEN CONCRETE DURING WINTER CONSTRUCTION
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摘要: 通过钢筋与混凝土的中心拉拔试验，研究施工期受冻对混凝土与钢筋粘结性能的影响。试验参数考虑施工期温度、防冻剂掺量和养护条件三种。试验获得钢筋与混凝土的荷载-滑移曲线，计算了极限粘结强度和粘结滑移，并与常温标准养护下的试件进行对比分析。试验结果表明:在低温状态下，防冻剂掺量不足或养护措施不当会造成钢筋与混凝土之间粘结性能不同程度的下降。Abstract: In this study,pull-out tests are carried out to research the bond behavior between steel bar and frozen concrete during winter construction.Test parameters are construction temperature,amount of anti-freezing admixture and curing condition.load-slip curve of steel bar and concrete is obtained,and factors such as ultimate bond strength and bond slip are analyzed and compared with specimens in standard curing condition.The test results show that bond properties between steel bar and concrete are degenerated due to inadequate amount of anti-freezing admixture and poor curing condition in low temperature.
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Key words:
- frozen damage during winter construction /
- reinforced /
- concrete /
- bond property /
- anti-freezing agent
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[2] 过镇海,时旭东.钢筋混凝土原理和分析[M].北京:清华大学出版社,2003. 赵羽习.钢筋混凝土结构粘结性能和耐久性的研究[D].杭州:浙江大学,2001. [3] 徐有邻.变形钢筋－ 混凝土粘结锚固性能的试验研究[D].北京:清华大学,1990. [4] Shih T S,Lee G C.Effect of Freezing Cycles on Bond Strength ofConcrete[J].Journal of Structural Engineering,1988,114(3）:717-726. [5] 巴恒静,赵霄龙,杨英姿,等.恒负温与变负温养护制度对混凝土性能的影响研究[J].哈尔滨建筑大学学报,2002,35(1）:81-85. [6] 朱卫中,王剑,钮长仁.负温高强混凝土冻结损伤参数适应性条件研究[J].低温建筑技术,2001(2):1-3. [7] GB 5015292 混凝土结构试验方法标准[S]. [8] JGJ 10497 建筑工程冬期施工技术规程[S]. -
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