超低温冻融循环对混凝土材料性能的影响

魏强; 谢剑; 吴洪海

doi:10.6052/j.issn.1000-4750.2012.04.S013

超低温冻融循环对混凝土材料性能的影响

魏强¹,
谢剑^1,2,,
吴洪海¹

1.
天津大学建筑工程学院土木工程系，天津300072；
2.
天津大学滨海土木工程结构与安全教育部重点实验室，天津300072

基金项目: 国家自然科学基金项目(51078260)

详细信息

作者简介:
魏强(1988―)，男，山东人，硕士生，从事低温混凝土结构力学性能试验研究(E-mail:sddzwei@126.com)；吴洪海(1986―)，男，河北人，硕士生，从事低温混凝土结构力学性能试验研究(E-mail:whhai1987@163.com).

通讯作者:
谢剑(1974―)，男，河北人，副教授，博士，硕导，从事混凝土基本理论研究(E-mail:xiejian@tju.edu.cn).

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出版历程
- 收稿日期: 2013-06-30
- 修回日期: 2013-06-30
- 刊出日期: 2013-06-24

EXPERIMENTAL ANALYSIS ON PROPERTIES OF CONCRETE AFTER FREEZE-THAW CYCLES UNDER EXTRA-LOW TEMPERATURES

1.
Department of Civil Engineering,Tianjin University,Tianjin 300072,China;
2.
Key Laboratory of Coast Civil Structure Safety,Ministry of Education,Tianjin University,Tianjin 300072,China

摘要

摘要: 借助低温冰箱和超低温加载箱降温的方式，考虑不同混凝土等级、不同冻融次数、不同冻融温度及不同含水量等因素，对63个混凝土立方体试块和21个钢筋混凝土拔出试件进行了冻融循环。通过对冻融循环后立方体试块的强度试验和拔出试件的拔出试验，探究了各因素对混凝土强度及钢筋与混凝土黏结强度的影响。此外，通过对立方体试块残样的SEM电镜扫描试验，揭示了冻融循环对混凝土微观结构的损伤过程及原理。结果表明：水胶比对冻融后混凝土的强度影响较大，添加高效减水剂有助于提高混凝土抵抗冻融破坏的能力；少次数超低温冻融循环对高标号混凝土的强度降低不显著；与混凝土抗压强度相比，低温和超低温冻融循环对抗拉强度的降低作用更加明显；SEM电镜扫描试验有效地解释了混凝土在冻融循环下强度降低的微观机理；少次数超低温冻融循环对钢筋与混凝土黏结强度的降低作用不容忽视。
- 超低温 /
- 冻融循环 /
- 混凝土 /
- 钢筋 /
- 强度 /
- 黏结性能
Abstract: With the cooling system of a low-temperature refrigerator and an extra-low temperature loading box, the freeze-thaw cycle test was carried out for 63 cube specimens and 21 pull-out specimens under different levels, different cycle times, different temperatures and different water contents. Though the test, the influence factors about the strength of concrete and the bonding strength between reinforcement and concrete were studied. Besides, the SEM test was carried out to reveal the damage of microstructures after the freeze-thaw cycles. The results show that: the strength of concrete after freeze-thaw cycles is affected by the water cement ratio obviously, and adding super plasticizer will improve the resistance ability of freeze-thaw damage; with fewer times of freeze-thaw cycles, the influence of strong concrete is not obvious; there is more reduction in tensile strength after freeze-thaw cycles than that in compressive strength; the test of SEM explains the microscopic mechanism after cycles effectively; the bonding strength between reinforcement and concrete has a significantly reduction after 5 freeze-thaw cycles.
- ultra-low temperatures /
- freeze-thaw cycles /
- concrete /
- reinforcement /
- strength /
- bonding properties

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参考文献(17)

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文章访问数: 473
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超低温冻融循环对混凝土材料性能的影响

作者简介: 魏强(1988―)，男，山东人，硕士生，从事低温混凝土结构力学性能试验研究(E-mail:sddzwei@126.com)；吴洪海(1986―)，男，河北人，硕士生，从事低温混凝土结构力学性能试验研究(E-mail:whhai1987@163.com).

通讯作者: 谢剑(1974―)，男，河北人，副教授，博士，硕导，从事混凝土基本理论研究(E-mail:xiejian@tju.edu.cn).

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出版历程

EXPERIMENTAL ANALYSIS ON PROPERTIES OF CONCRETE AFTER FREEZE-THAW CYCLES UNDER EXTRA-LOW TEMPERATURES

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出版历程

目录

作者简介:
魏强(1988―)，男，山东人，硕士生，从事低温混凝土结构力学性能试验研究(E-mail:sddzwei@126.com)；吴洪海(1986―)，男，河北人，硕士生，从事低温混凝土结构力学性能试验研究(E-mail:whhai1987@163.com).

通讯作者:
谢剑(1974―)，男，河北人，副教授，博士，硕导，从事混凝土基本理论研究(E-mail:xiejian@tju.edu.cn).