全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

冻融与侵蚀作用下引气混凝土劣化微观机理

, PP. 1392-1396

Full-Text   Cite this paper   Add to My Lib

Abstract:

对经历冻融循环和海水浸泡交替作用后含气量为5.9%的引气混凝土试件进行抗压强度、质量损失、相对动弹性模量及扫描电子显微镜检测,以研究冻融循环和海水浸泡交替作用下引气混凝土的劣化机理.通过观察引气混凝土试件表面和中间处的微观结构,发现未受到冻融循环时,几乎不见裂缝和晶体,随着冻融循环次数增加,微裂缝逐渐发展,当冻融循环达到300次时,主裂缝深入发展,并有晶体产生.可见海水侵蚀和冻融循环交替作用,导致微裂缝产生并发展,同时化学反应产生了晶体.物理和化学损伤累积导致引气混凝土抗压强度降低达8.5%,但是相对动弹性模量和质量损失在冻融循环和海水浸泡交替作用前后均变化较小.

References

[1]  Shang H S,Song Y P,Ou J P.Mechanical behaviour of air-entrained concrete[J].Magazine of Concrete Research,2009, 61(2) :87-94
[2]  Ringota E,Bascou A.About the analysis of microcracking in concrete[J].Cement & Concrete Composites,2001,22(3):261-266
[3]  高润东,李庆斌.复杂环境下混凝土硫酸盐侵蚀微-宏观劣化规律研究[D].北京:清华大学水利水电工程系,2010 Gao Rundong,Li Qingbin.Micro-Macro degradation regularity of sulfate attack on concrete under complex environments[D].Beijing: Hydraulic Engineering,Tsinghua University,2010(in Chinese)
[4]  郑晓宁,刁波,孙洋.混合侵蚀与冻融交替作用下持续承载RC梁性能劣化机理研究[J].建筑结构学报,2009,12:287-291 Zheng Xiaoning,Diao Bo,Sun Yang.Properties deterioration mechanism of RC beams sustained loading under alternative actions of mix-aggressive solution and freeze-thaw circles[J].Journal of Building Structures,2009,12:287-291(in Chinese)
[5]  李淑进,赵铁军,吴科如.混凝土渗透性与微观结构关系的研究[J].混凝土与水泥制品,2004(4):6-8 Li Shujin,Zhao Tiejun,Wu Keru.Relations of concrete permeability and micro structure[J].China Concrete and Cement Products,2004(4):6-8(in Chinese)
[6]  Promentilla B,Angelo M,Takafumi S.X-Ray micro tomography of mortars exposed to freezing-thawing action[J].Journal of Advanced Concrete Technology,2010,8,97-111
[7]  Zhang Zhenyu,Dai Changlu,Zhang Quanchang,et al.Research on formation mechanism of as 5-phase and as 3-phase[J].Chinise Sciense B,1991(1):82-89
[8]  Sun Zhenhua,Scherer G W.Effect of air voids on salt scaling and internal freezing[J].Cement and Concrete Research,2009,9:260-270
[9]  王佩玲,王心磊,黄月鸿,等.氯镁水泥硬化体的显微结构及结构强度[J].无机材料学报,1990,5(1) :61-67 Wang Peiling,Wang Xinlei,Huang Yuehong,et al.Micro structure and structural strength of hardened magnesium oxychloride cement[J].Journal of Inorganic Materials,1990,5(1):61-67(in Chinese)
[10]  金祖权,孙伟,张云升,等.混凝土在硫酸盐、氯盐溶液中的损伤过程[J].硅酸盐学报,2006,34 (5):630-635 Jin Zuquan,Sun Wei,Zhang Yunsheng,et al.Damage of concrete in sulfate and chloride solution[J].Journal of the Chinese Ceramic Society,2006,34 (5):630-635(in Chinese)
[11]  慕儒,缪昌文,刘加平,等.氯化钠、硫酸钠溶液对混凝土抗冻性的影响及其机理[J].硅酸盐学报,2001,29(6): 523-529 Mu Ru,Miao Changwen,Liu Jiaping,et al.Effect of NaCl and Na2SO4 solution on the frost resistance of concrete and it's mechanism[J].Journal of the Chinese Ceramic Society,2001, 29(6) : 523-529(in Chinese)
[12]  Shang Huaishuai,Song Yupu,Ou Jinping.Behavior of air-entrained concrete after freeze-thaw cycles[J].Acta Mechanica Solida Sinica,2009,22(3):261-266
[13]  Shang H S,Song Y P,Ou J P.Mechanical behaviour of air-entrained concrete[J].Magazine of Concrete Research,2009, 61(2) :87-94
[14]  高润东,李庆斌.复杂环境下混凝土硫酸盐侵蚀微-宏观劣化规律研究[D].北京:清华大学水利水电工程系,2010 Gao Rundong,Li Qingbin.Micro-Macro degradation regularity of sulfate attack on concrete under complex environments[D].Beijing: Hydraulic Engineering,Tsinghua University,2010(in Chinese)
[15]  郑晓宁,刁波,孙洋.混合侵蚀与冻融交替作用下持续承载RC梁性能劣化机理研究[J].建筑结构学报,2009,12:287-291 Zheng Xiaoning,Diao Bo,Sun Yang.Properties deterioration mechanism of RC beams sustained loading under alternative actions of mix-aggressive solution and freeze-thaw circles[J].Journal of Building Structures,2009,12:287-291(in Chinese)
[16]  李淑进,赵铁军,吴科如.混凝土渗透性与微观结构关系的研究[J].混凝土与水泥制品,2004(4):6-8 Li Shujin,Zhao Tiejun,Wu Keru.Relations of concrete permeability and micro structure[J].China Concrete and Cement Products,2004(4):6-8(in Chinese)
[17]  Zhang Zhenyu,Dai Changlu,Zhang Quanchang,et al.Research on formation mechanism of as 5-phase and as 3-phase[J].Chinise Sciense B,1991(1):82-89
[18]  王佩玲,王心磊,黄月鸿,等.氯镁水泥硬化体的显微结构及结构强度[J].无机材料学报,1990,5(1) :61-67 Wang Peiling,Wang Xinlei,Huang Yuehong,et al.Micro structure and structural strength of hardened magnesium oxychloride cement[J].Journal of Inorganic Materials,1990,5(1):61-67(in Chinese)

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133