荷载损伤后混凝土劣化机理和试验研究

朱方之; 赵铁军; 姜福香; 马志鸣

doi:10.13204/j.gyjz201212015

荷载损伤后混凝土劣化机理和试验研究

doi: 10.13204/j.gyjz201212015

1.
1. 西安建筑科技大学土木工程学院,西安 710055;
2.
2. 宿迁学院建筑工程系,江苏宿迁 223800;
3.
3. 青岛理工大学,山东青岛 266033

基金项目:

国家重点基础研究发展(973)计划资助项目(2009CB623203);国家自然科学基金重点项目(50739001)

详细信息

作者简介:
朱方之，男，1973 年出生，博士研究生。E-mail:fzzhu@sqc.edu.cn

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- 文章访问数: 79
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- 被引次数: 0
出版历程
- 收稿日期: 2012-08-15
- 刊出日期: 2012-12-20

EXPERIMENTAL STUDY AND ANALYSIS ON DETERIORATION MECHANISM OF DAMAGED CONCRETE INDUCED BY MECHANICAL LOAD

1.
1. School of Civil Engineering,Xi'an University of Architecture &Technology,Xi'an 710055,China;
2.
2. Department of Building Engineering,Suqian College,Suqian 223800,China;
3.
3. Qingdao Technological University,Qingdao 266033,China

摘要

摘要: 在分析混凝土荷载损伤后混凝土劣化机理的基础上,通过短期轴拉和短期轴压静载后混凝土抗氯离子侵蚀和抗冻性性能试验,研究荷载损伤对混凝土长期耐久性能的影响。结果表明:受压荷载作用下混凝土依次经历可逆、不可逆和加速劣化三个劣化阶段,受拉荷载下混凝土表现为耐久性持续劣化。在65%和75%轴拉荷载水平,混凝土表观氯离子扩散系数分别增加了6.4%和34%,表面氯离子浓度分别增大了10%和40%,显现出轴拉荷载的负效应;随着轴压荷载水平的增加,混凝土抗冻性能经历一个正效应到负效应的转变。
- 荷载损伤 /
- 劣化机理 /
- 氯离子侵蚀 /
- 冻融
Abstract: The durability failure mechanism of damaged concrete induced by mechanical load was analyzed firstly in this paper.Then through the chloride penetration test and freezing-thawing test of concrete specimens after direct uniaxial tensile or compressive loading,the load-induced damage influence on the long-term durability of concrete was investigated.The results indicated that concrete changed from reversible phase,irreversible phase to accelerated degradation phase under the action of compressive load.But the concrete under tension load experienced continuous degradation.When the uniaxial tensile load level reached the 65% and 75% of ultimate capacity,the apparent chloride diffusion coefficient of concrete increased by 6.4% and 34%,and the surface chloride concentration increased by 10% and 40% respectively,which showed the negative effect.But with the increasing of uniaxial compressive load level,the influence on frost resistance of concrete experienced from a positive effectto a negative effect transformation.
- load-induced damage /
- deterioration mechanism /
- chloride penetration /
- freezing and thawing

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参考文献(18)

[2] Mehta P K.Concrete in the Marine Environment[M].[S.l.]:TaylorFrancis Group,1991:5-10

Sun W,Zhang Y M,Yan H D,et al.Damage and DamageResistance with Different Strength Grade Under Double DamageFactors[J].Cem Conc Comp,1999,21:439-442.

[3] Cook D J,Chindaprasirt P.Influence of Loading History upon theTensile Properties of Concrete[J].Magazine of ConcreteResearch,1981,33(116):154-160.

[4] Gerstle K H,Ko H Y.Stress-Strain Curves of Concrete UnderMultiaxial Load Histories[C]∥Preprints-William Prager Sympo-sium on Mechanics of Geomatirials:Rocks,Concretes,Soils.1983.

[5] 林皋,王哲,逯静洲,等.三向等压荷载历史对混凝土的强度和变形特性影响的研究[J].水力发电学报,2001(3):31-41.

[6] 肖诗云,张剑.历经荷载历史混凝土动态受压试验研究[J].大连理工大学学报,2011,51(1):78-83.

[7] Shah S P,Chandra S.Critical Stress,Volume Change andMicrocracking of Concrete[J].ACI J,1968(9):770-780.

[8] Lim C C,Gowripalan N,Sirivivatnanon V.Micro Cracking andChloride Permeability of Concrete Under Uniaxial Compression[J].Cement and Concrete Composite,2000,22(6):353-360.

[9] Locoge P,Massat M,Ollivier J P,et al.Ion Diffusion in Micro-Cracked Concrete[J].Cement and Concrete Research,1992,22(2):431-438.

[10] Francois R,Maso J C.Effect of Damage in Reinforced Concrete on Carbonation or Chloride Penetration[J].Cement and Concrete Research,1988,18(6):961-970.

[11] 邢锋,冷发光,冯乃谦,等.长期持续荷载对素混凝土氯离子渗透性的影响[J].混凝土,2004(5):3-8.

[12] 姜福香.基于机械荷载损伤的混凝土结构耐久性研究[D].西安:西安建筑科技大学,2011.

[13] 姚燕.中国混凝土材料耐久性研究的新进展[J].混凝土与水泥制品,2002(12):39-42.

[14] 朱方之,赵铁军,张卫东.冻融和其它因素复合下混凝土的耐久性研究进展[J].材料导报,2011,25(10):143-146.

[15] Sun W,Zang Y M,Yan H D.Damage and Damage Resistance of High Strength Concrete Under the Action of Load and Freeze-Thaw Cycles[J].Cement and Concrete Research,1999(29):15-19.

[16] 严安,李启令,吴科如.高性能混凝土在荷载作用下的冻融性能及其可靠性分析[J].混凝土与水泥制品,2000,3(6):3-6.

[17] 吕培印,宋玉普,李庆斌.混凝土轴拉疲劳试验及损伤模型[J].水利学报,2002(12):79-85.

[18] 宋玉普,杨健辉,赵东拂.单侧压下混凝土受拉疲劳试验研究[J].大连理工大学学报,2004,24(2):91-95.

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