Effect of Freeze-Thaw Cycles and Corrosion on Bond Behavior of Reinforced Concrete

doi:10.3969/j.issn.1674-0696.2021.05.13

Abstract

Abstract: By laboratory experiments, the effect of freeze-thaw cycles and corrosion on the interfacial bonding properties of reinforced concrete specimens was researched. Results show that the mortar is fallen off, the aggregate is exposed and the mechanical properties are declined under the freeze-thaw action. When the corrosion rate is small, the bond behavior of reinforced concrete is enhanced. But when the corrosion rate is large, the bond behavior of the reinforced concrete is lower than that of the non-corroded specimen, and the serious corrosion will reduce the bond behavior of reinforced concrete. The joint action of corrosion and freeze-thaw causes the decrease of concrete strength, the enhancement of plasticity and the obvious decrease of bond behavior between steel and concrete. With the increase of freeze-thaw times, the ultimate tensile load of the reinforced concrete decreases gradually. Under the joint action of corrosion and freeze-thaw, the relationship between tensile force and displacement is piecewise linear at the initial tension stage of reinforced concrete specimens. When the tension force reaches the ultimate load, the tension-displacement curve shows obvious plastic deformation characteristics.

Key words: hydraulic engineering, reinforced concrete, corrosion, freeze-thaw cycle, bond behavior

摘要： 通过室内试验，研究了冻融循环与锈蚀作用对钢筋混凝土试件界面黏结性能的影响。结果表明：冻融作用使混凝土表面砂浆脱落、骨料露出，力学性能下降；锈蚀率较低时，钢筋混凝土的黏结性能反而增强，但锈蚀率较大时，其黏结性能较未锈蚀试件有所降低，严重的锈蚀会降低钢筋混凝土的黏结性能；锈蚀与冻融共同作用导致混凝土强度降低，塑性增强，钢筋与混凝土之间的黏结性能明显下降，随着冻融次数的增加，钢筋混凝土的极限抗拉荷载逐渐降低；在锈蚀与冻融共同作用下，钢筋混凝土试件受拉的初始阶段，拉力与位移的关系呈分段线性关系，当拉力达到极限荷载后，拉力-位移曲线出现明显塑性变形特性。

关键词: 水利工程, 钢筋混凝土, 锈蚀, 冻融循环, 黏结性能

CLC Number:

TV431
TU528

DONG Yuwen1, YU Xin2, QIN Yao1, WANG Zongbo1. Effect of Freeze-Thaw Cycles and Corrosion on Bond Behavior of Reinforced Concrete[J]. Journal of Chongqing Jiaotong University(Natural Science), 2021, 40(05): 81-86.

董玉文1，余鑫2，秦瑶1,王宗波1. 冻融与锈蚀作用对钢筋混凝土黏结性能的影响[J]. 重庆交通大学学报（自然科学版）, 2021, 40(05): 81-86.

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