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J4  2012, Vol. 46 Issue (1): 58-63    DOI: 10.3785/j.issn.1008-973X.2012.01.10
土木工程     
硫酸盐侵蚀环境下混凝土双K断裂参数试验研究
董宜森,王海龙,金伟良
浙江大学 土木工程学系,浙江 杭州 310058
Experimental study on double-K fracture parameters of
concrete exposed to sulfate environment
DONG Yi-sen, WANG Hai-long, JIN Wei-liang
Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China
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摘要:

为了评估硫酸盐侵蚀环境下混凝土的工作性能并为断裂分析提供依据,采用三点弯曲梁试验方法,研究在硫酸盐侵蚀和干湿循环双重作用下混凝土双K断裂参数等断裂性能的劣化规律.基于断裂力学理论,通过在裂缝尖端表面粘贴应变片来监测裂缝的起裂、扩展和失稳断裂情况,得到在不同硫酸盐侵蚀龄期下试件的P-CMOD曲线.以侵蚀系数为评价指标,采用混凝土双K断裂准则计算构件的失稳韧度和起裂韧度.结果表明:起裂荷载与最大荷载的比值PQ/Pmax大致分布在0.55~0.90,失稳韧度和起裂韧度在侵蚀初期均有较明显的增大,转折点分别为60和30 d,之后随侵蚀龄期不断缓慢减小.与失稳韧度相比,起裂韧度受硫酸盐侵蚀因素的影响较敏感.

Abstract:

The deterioration regularity of double-K fracture parameters of concrete under sulfate attack and drying-wetting cycle environment was investigated by three-point bending beam test in order to assess the performance of concrete due to sulfate attack and provide references for  fracture analysis. The initiation, propagation and unstable development of crack in the concrete were monitored by pasting some strain gauges onto the precrack tip based on the fracture mechanics. The load-crack mouth opening displacement (P-CMOD) curves under different sulfate attack periods were obtained by the experiment. Taking the erosion coefficient as an evaluation index, the unstable fracture toughness and the initial fracture toughness were calculated according to the double-K criterion. Experimental results indicated that the ratio of the initial cracking load to the unstable fracture load (PQ/Pmax) approximately varied between 0.55 and 0.90. Both unstable fracture toughness and initial fracture toughness obviously increased during the early stage of sulfate ingression, and reduced continuously and slowly with a turning point at 60 and 30 days respectively. The initial fracture toughness was more sensitive to sulfate attack than the unstable fracture toughness.

出版日期: 2012-02-22
:  TU 528  
基金资助:

国家自然科学基金资助项目(50809061, 51178417);杭州市科技计划软科学经费资助项目.

通讯作者: 王海龙,男,副教授.     E-mail: hlwang@zju.edu.cn
作者简介: 董宜森(1986-),男,硕士生,从事混凝土耐久性研究. E-mail: civilnainiu@zju.edu.cn
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引用本文:

董宜森,王海龙,金伟良. 硫酸盐侵蚀环境下混凝土双K断裂参数试验研究[J]. J4, 2012, 46(1): 58-63.

DONG Yi-sen, WANG Hai-long, JIN Wei-liang. Experimental study on double-K fracture parameters of
concrete exposed to sulfate environment. J4, 2012, 46(1): 58-63.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2012.01.10        http://www.zjujournals.com/eng/CN/Y2012/V46/I1/58

[1] 黄战, 邢锋, 邢媛媛, 等.硫酸盐侵蚀对混凝土结构耐久性的损伤研究[J].混凝土, 2008(8): 45-49.
HUANG Zhan, XING Feng, XING Yuanyuan, et al. Durability damage of concrete structures caused by sulfate attack [J]. Concrete, 2008(8): 45-49.
[2] 梁咏宁, 袁迎曙. 硫酸盐侵蚀环境因素对混凝土性能退化的影响[J].中国矿业大学学报, 2005, 34(4): 452-457.
LIANG Yongning, YUAN Yingshu. Effects of environmental factors of sulfate attack on deterioration of concrete mechanical behavior [J]. Journal of China University of Mining and Technology, 2005, 34(4): 452-457.
[3] 高立强, 李固华. 混凝土硫酸盐侵蚀影响因素探讨[J].四川建材, 2006, 32(4): 1-4.
GAO Liqiang, LI Guhua. Investigation on influencing factors of sulfate attack of concrete [J]. Sichuan Building Materials, 2006, 32(4): 1-4.
[4] KAPLAN M F. Crack propagation and the fracture of concrete [J]. Journal of American Concrete Institute, 1961, 58(5): 591-610.
[5] XU Shilang, REINHARDT H W. A simplified method for determining doubleK fracture parameters for threepoint bending tests [J]. International Journal of Fracture, 2000, 104(2): 181-208.
[6] 徐世烺, 周厚贵, 高洪波. 各种级配大坝混凝土双K断裂参数试验研究[J]. 土木工程学报, 2006, 39(11): 50-62.
XU Shilang, ZHOU Hougui, GAO Hongbo. An experimental study on doubleK fracture parameters of concrete for dam construction with various grading aggregates [J]. China Civil Engineering Journal, 2006, 39(11): 50-62.
[7] 吴智敏, 徐世烺, 刘佳毅. 光弹贴片法研究混凝土裂缝扩展过程及双K断裂参数的尺寸效应[J]. 水利学报, 2001, 32(4): 34-39.
WU Zhimin, XU Shilang, LIU Jiayi. Study on crack propagation process of concrete and size effect of doubleK fracture parameter by means of photoelastic coatings [J]. Journal of Hydraulic Engineering, 2001, 32(4): 34-39.
[8] 徐世烺, 张秀芳, 郑爽. 小骨料混凝土双K断裂参数的试验测定[J].水利学报, 2006, 37(5): 543-553.
XU Shilang, ZHANG Xiufang, ZHENG Shuang. Experimental measurement of doubleK fracture parameters of concrete with small size aggregate [J]. Journal of Hydraulic Engineering, 2006, 37(5): 543-553.
[9] 张滇军, 徐世烺, 郝红曼. 基于碳纤维混凝土(CFRC)机敏性的三点弯曲梁断裂参数试验研究[J].水力发电学报, 2008, 27(2): 71-77.
ZHANG Dianjun, XU Shilang, HAO Hongman. Experimental study on fracture parameters of threepoint bending beam based on smart properties of CFRC [J]. Journal of Hydroelectric Engineering, 2008, 27(2): 71-77.
[10] DL/T5332-2005, 水工混凝土断裂试验规程[S].北京: 中国电力出版社, 2006.
[11] CLIFTON J R, KNAB L I. Service life of concrete [R].  Washington: Nuclear Regulatory Commission;  Gaithersburg: National Institute of Standards and Technology, 1989.

[12] CODY R D, CODY A M. Reduction of concrete deterioration by ettringite using crystal growth inhibition techniques [R]. City of Ames:  Iowa State University, 2001.
[13] 吕林女, 何永佳, 丁庆军, 等. 混凝土的硫酸盐侵蚀机理及其影响因素[J].焦作工学院学报, 2003, 22(6): 465-468.
LV Linnv, HE Yongjia, DING Qingjun, et al. Mechanism and affecting factors of sulphate erosion in concrete [J]. Journal of Jiaozuo Institute of Technology, 2003, 22(6): 465-468.
[14] 张风杰, 吴庆, 向伟, 等. 混凝土的硫酸盐腐蚀研究[J].徐州工程学院学报, 2007, 22(4): 57-59.
ZHANG Fengjie, WU Qing, XIANG Wei, et al. Research on sulfate attack on concrete [J]. Journal of Xuzhou Institute of Technology, 2007, 22(4): 57-59.
[15] 徐世烺. 混凝土双K断裂参数计算理论及规范化测试方法[J].三峡大学学报, 2002, 24(1): 1-8.
XU Shilang. The calculation approaches of doublek fracture parameters of concrete and a possible coding standard test method for determining them [J]. Journal of China Three Gorges University, 2002, 24(1): 1-8.
[16] MEHTA P K, PIRTZ D. Properties of alite cement [J]. Cement and Concrete Research, 1979, 9(4): 439-450.

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