|本期目录/Table of Contents|

[1]张云清,余红发,王甲春.气泡特征对混凝土抗盐冻性能的影响[J].建筑科学与工程学报,2011,28(03):83-87.
　ZHANG Yun-qing,YU Hong-fa,WANG Jia-chun.Effect of Air-bubble Characteristics on Salt Frost Resistance of Concrete[J].Journal of Architecture and Civil Engineering,2011,28(03):83-87.
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气泡特征对混凝土抗盐冻性能的影响(PDF)
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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:
28卷
期数:
2011年03期
页码:
83-87
栏目:
出版日期:
2011-09-20

文章信息/Info

Title:
Effect of Air-bubble Characteristics on Salt Frost Resistance of Concrete
作者:
张云清1,2,余红发2,王甲春3
1. 南京农业大学 工学院,江苏 南京 210031; 2. 南京航空航天大学 土木工程系,江苏 南京 210016; 3. 厦门理工学院 土木工程与建筑系,福建 厦门 361024
Author(s):
ZHANG Yun-qing1,2, YU Hong-fa2, WANG Jia-chun3
1. School of Engineering, Nanjing Agricultural University, Nanjing 210031, Jiangsu, China; 2. Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, Jiangsu, China; 3. Department of Architectural Engineering
关键词:
高性能混凝土;  引气混凝土;  抗盐冻性能;  气泡特征;  冻融循环;  相对动弹性模量
Keywords:
high performance concrete;  air-entrained Portland concrete;  salt frost resistance;  air-bubble characteristic;  freezing-thawing cycle;  relative dynamic elastic modulus
分类号:
TU528
DOI:
-
文献标志码:
A
摘要:
采用快冻法研究了普通混凝土(OPC)、引气混凝土(APC)和高性能混凝土(HPC)在质量分数为3.5%的NaCl溶液中的抗盐冻性能,并借助低真空扫描电子显微镜(SEM)观测了水泥浆体中气泡特征,研究了混凝土气孔结构对混凝土抗盐冻性能的影响规律。结果表明:在水胶比0.50的OPC浆体中,引入直径小于30 μm、间距小于60 μm,且均匀、独立分布的密闭气泡可以显著提高OPC的抗盐冻性能; 对于强度等级C40的HPC,气泡结构是影响混凝土抗盐冻性能的主要因素,掺加引气剂、获得优异的气泡结构是提高其抗盐冻性能的有效途径; 对于掺硅粉的HPC,当水胶比小于0.31时,气泡结构特征不再是影响其抗盐冻性的主要因素,即使不添加引气剂,这种混凝土也具有较高的抗盐冻性能。
Abstract:
The salt frost resistance and air void parameters with ordinary Portland concrete(OPC), air-entrained Portland concrete(APC)and high performance concrete(HPC)subjected to the action of 3.5%(in mass fraction)sodium chloride(NaCl)solution were studied by the accelerated freezing-thawing method. The air-bubble characteristic was examined through scanning electron microscopy(SEM). The results show that the diameter is less than 30 μm, the spacing factor is less than 60 μm, and independent distribution of the sealed air-bubble can significantly improve the salt frost resistance of the OPC with water-binder ratio of 0.50; for C40 of the HPC, the air-bubble structure is a major factor for salt frost resistance; adding air entraining agent to obtain excellent air-bubble structure is the effective means for improving salt frost resistance of concrete. Adding silica fume, water-binder ratio is less than 0.31 for HPC, air-bubble structure characteristic is not a major factor for salt frost resistance, this concrete has higher salt frost resistance, even without adding air-entraining agents.

参考文献/References:

[1] AITCIN P C.The Durability Characteristics of High Performance Concrete:a Review[J].Cement & Concrete Composites,2003,25(4/5):409-420.
[2]CHATTERJI S.Aspects of Freezing Process in Porous Material-water System—Part 2.Freezing and Properties of Frozen Porous Materials[J].Cement and Concrete Research,1999,29(5):781-784.
[3]毛继泽,齐 辉,鲇田耕一.轻骨料含水率对混凝土吸水性及抗冻性的影响[J].建筑材料学报,2009,12(4):473-477. MAO Ji-ze,QI Hui,AYUTA K.Effects of Water Content in Lightweight Aggregate on Water-absorbing Property and Freeze-thaw Resistance of Concrete[J].Journal of Building Materials,2009,12(4):473-477.
[4]朱蓓蓉,杨全兵,吴学礼,等.SJ-2新型引气剂及其引气混凝土性能[J].混凝土,2001(4):21-24. ZHU Bei-rong,YANG Quan-bing,WU Xue-li,et al.Properties of Concrete with a New Type of Air-entraining Agent(Trandemark SJ-2)[J].Concrete,2001(4):21-24.
[5]李兴翠,邓德华,何富强.混凝土中含气量影响因素的研究[J].低温建筑技术,2008(1):17-19. LI Xing-cui,DENG De-hua,HE Fu-qiang.Study on Factors Influencing Air Content of Air-entrained Concrete[J].Low Temperature Architecture Technology,2008(1):17-19.
[6]ABABNEH A N.The Coupled Effect of Moisture Diffusion,Chloride Penetration and Freezing-thawing on Concrete Durability[D].Denver:University of Colorado,2002.

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备注/Memo

备注/Memo:
收稿日期:2011-06-17
基金项目:国家重点基础研究发展计划(“九七三”计划)项目(2009CB623203); 江苏省自然科学基金前期预研项目(BK2005216); 中国博士后科学基金项目(20060400284); 南京航空航天大学博士生创新基金项目(BCXJ07-04)
作者简介:张云清(1977-),女,吉林九台人,南京航空航天大学工学博士研究生,E-mail:zhangyunqing@nuaa.edu.cn。
更新日期/Last Update: 2011-09-20