冻融损伤后钢筋与再生混凝土黏结滑移性能试验研究

发布时间：2018-01-28 03:35

本文关键词： 再生混凝土冻融循环拉拔试验黏结强度黏结滑移　出处：《工程力学》2017年S1期 　论文类型：期刊论文

【摘要】：对经过0次、25次、50次、75次、100次冻融循环作用后的再生混凝土(粗骨料取代率100%)进行拉拔试验研究,得出不同冻融循环次数、保护层厚度和锚固长度下钢筋与再生混凝土间黏结性能的变化规律。结果表明:随着冻融循环次数的增加,钢筋与再生混凝土间的黏结强度逐渐降低,而滑移值逐渐增加;黏结强度随着相对保护层厚度的增加而增大且呈线性关系,随着相对锚固长度的增加,黏结强度却随之减小,当相对保护层厚度和锚固长度增加到一定值后,黏结强度基本保持不变。基于试验结果给出黏结-滑移曲线,曲线分为微滑移线性阶段、滑移阶段、滑移加速阶段、非线性下降段和残余阶段等5个阶段。通过分析试验数据提出不同影响因素下各阶段黏结锚固特征值的拟合计算公式,为我国冻融环境下再生混凝土结构的耐久性设计提供参考。
[Abstract]:After 0 times, 25 times, 50 times, 75 times, 100 times of freezing and thawing of recycled concrete (coarse aggregate replacement rate of 100%) studied drawing, draw different freeze-thaw cycles, protective layer thickness and the variation of anchorage length between the rebar and the recycled concrete bonding properties. The results showed that: with the increase of the number of freeze-thaw cycles, the bond strength between steel and recycled concrete decreased gradually, while the slip value increased gradually with the increase of the thickness of bonding strength; relative protection increases linearly, with the relative increase of anchorage length, bond strength decreases, when the relative thickness of the protective layer and the anchorage length increased to a certain value, the bond strength remained unchanged. The experimental results are given based on the bond slip curve, the curve is divided into micro slip slip slip stage, linear phase, accelerated phase, nonlinear decline phase and residual phase of 5 In order to provide reference for durability design of recycled aggregate concrete structure in freeze-thaw environment, the fitting formulas for each stage of bond and anchorage characteristic values under different influencing factors are put forward.

【作者单位】：内蒙古科技大学土木工程学院;
【基金】：内蒙古自治区自然科学基金项目(2014MS0551,2016MS0547) 内蒙古自治区高等学校科学研究项目(NJZY159) 包头市科技计划项目(2014X1009)
【分类号】：TU528
【正文快照】： 混凝土的冻融破坏是影响混凝土结构耐久性寿命的重要因素[1]。再生混凝土是将废弃混凝土块经破碎、清洗、分级和按一定比例配合后得到的“再生骨料”作为部分或全部骨料代替天然骨料配制而成的新型混凝土[2]。再生混凝土具有节约资源、减少污染和保护环境等优点,对实现建筑业

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