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冻融循环作用下新老混凝土粘结的劈拉性能试验研究
2005年第5期
冻融循环;新老混凝土粘结;劈拉性能
Freeze-thawing cycle; Adherence of new concrete to old one; Splitting tensile performance
2005年第5期
1000-4637(2005)05-14-03
国家重大基础研究前期计划项目(2004CCA04100)
程红强,高丹盈,李平先
郑州大学环境与水利学院, 450002

程红强,高丹盈,李平先

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摘 要: 采用新老混凝土粘结而制作的立方体试件,通过快速冻融试验,研究了冻融循环作用对新老混凝土粘结性能的影响。试验包括对已有的混凝土经历冻融循环作用后再与新混凝土粘结和新老混凝土粘结后再经历冻融循环两种情况,探索了冻融循环次数、粘结面粗糙度和界面剂类型等因素对粘结面劈拉强度的影响规律,分析了冻融循环作用对新老混凝土粘结面的损伤机理,并对遭受冻融破坏的混凝土结构粘结修补提出了建议。 Abstract: The influence of freeze-thaw cycling on the bonding perporemance of post-casting concrete to old concrete is studied by the accelerated freeze-thawing tests, the speciments are shaped as cubic and made by bonding of fresh concrete to old concrete. The tests include two groups, one is the old concrete that has already undergone the freezing - thawing and then was bonded by fresh concrete, after curring the splitting tests were carried out; the other one is that, the cubic speciments are made by fresh and old concrete and after curring undergone the freez-thawing tests, and finery the splitting tests were carried out. The factors that influence the splitting tensile strength such as the number of freezing thawing cycles, the roughness of interfaces and the type of interfacial agent are experimentally studied, and the mechanism on demage of bond of interface is analysed. Finally, a suggestion for repairing a damaged structure due to freeze-thawing is given up.
英文名 :
刊期 : 2005年第5期
关键词 : 冻融循环;新老混凝土粘结;劈拉性能
Key words : Freeze-thawing cycle; Adherence of new concrete to old one; Splitting tensile performance
刊期 : 2005年第5期
DOI :
文章编号 : 1000-4637(2005)05-14-03
基金项目 : 国家重大基础研究前期计划项目(2004CCA04100)
作者 : 程红强,高丹盈,李平先
单位 : 郑州大学环境与水利学院, 450002

程红强,高丹盈,李平先

摘要
参数
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参考文献
引用本文

摘   要: 采用新老混凝土粘结而制作的立方体试件,通过快速冻融试验,研究了冻融循环作用对新老混凝土粘结性能的影响。试验包括对已有的混凝土经历冻融循环作用后再与新混凝土粘结和新老混凝土粘结后再经历冻融循环两种情况,探索了冻融循环次数、粘结面粗糙度和界面剂类型等因素对粘结面劈拉强度的影响规律,分析了冻融循环作用对新老混凝土粘结面的损伤机理,并对遭受冻融破坏的混凝土结构粘结修补提出了建议。

Abstract: The influence of freeze-thaw cycling on the bonding perporemance of post-casting concrete to old concrete is studied by the accelerated freeze-thawing tests, the speciments are shaped as cubic and made by bonding of fresh concrete to old concrete. The tests include two groups, one is the old concrete that has already undergone the freezing - thawing and then was bonded by fresh concrete, after curring the splitting tests were carried out; the other one is that, the cubic speciments are made by fresh and old concrete and after curring undergone the freez-thawing tests, and finery the splitting tests were carried out. The factors that influence the splitting tensile strength such as the number of freezing thawing cycles, the roughness of interfaces and the type of interfacial agent are experimentally studied, and the mechanism on demage of bond of interface is analysed. Finally, a suggestion for repairing a damaged structure due to freeze-thawing is given up.

关键词:
冻融循环;新老混凝土粘结;劈拉性能
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冻融循环对新老混凝土粘结面的劈拉强度影响较大。老混凝土表面的处理方式和界面剂类型对冻融循环作用下新老混凝土粘结劈拉强度有不同程度影响。在本文试验条件下对先冻后粘结试件以劈裂加工的(P型)表面、水泥膨浆界面剂(U型)组合效果最好;对先粘结后冻试件以P型界面、水泥砂浆界面剂(S型)组合效果最好。但新老混凝土粘结面抵抗冻融循环破坏的能力整体偏低。
工程实际中,对受冻融损伤的已有混凝土结构,采用新混凝土粘结补强加固时,对老混凝土表面进行适当的粗糙处理和采用必要的界面剂,对粘结补强加固效果十分必要。如何进一步提高新老混凝土粘结面的抗冻融破坏能力,尚需深入探讨。
[1] 施士升.冻融循环对混凝土力学性能的影响[J].土木工程学报,1997,30(4):35-42
[2]中国工程建设标准化协会标准.混凝土结构加固技术规范(CECS25:90)[S].北京:中国计划出版社,1991
[3]李平先.新老混凝土粘结面抗冻和抗渗性能试验研究[D].大连理工大学,大连,2004   
[4] 中华人民共和国电力行业标准。水工混凝土试验规程(DL/T5150-2001) [S]。北京:中国电力出版社,2002
[5] 李平先,张雷顺,赵国藩。新老混凝土粘结面的抗冻剪切性能试验研究[J]。水利学报,2005,36(3):339-345

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