酸腐蚀下混凝土性能的变化

丁铸; 邢锋; 殷慧

doi:10.13204/j.gyjz200905021

酸腐蚀下混凝土性能的变化

doi: 10.13204/j.gyjz200905021

1.
深圳大学土木工程学院深圳市土木工程耐久性重点实验室,深圳 518060

基金项目:

国家自然科学基金项目(50538060);教育部新世纪优秀人才支持计划(NCET-050704)

详细信息

作者简介:
丁铸，男，1962年出生，教授，博士。E-mail:dz3693@1261.com

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- 文章访问数: 63
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- PDF下载量: 28
- 被引次数: 0
出版历程
- 收稿日期: 2008-08-12
- 刊出日期: 2009-05-20

PROPERTIES VARIATION OF CONCRETE ATTACKED BY ACIDIC SOLUTIONS

1.
Shenzhen Key Lab of Civil Engineering Durability,College of Civil Engineering Shenzhen University,Shenzhen 518060,China

摘要

摘要: 根据酸雨的特点配制了5种具有不同pH值、不同硫酸根离子浓度的酸性溶液，研究了混凝土在干湿循环、酸性溶液侵蚀30d到150d强度的变化、表层混凝土的吸水性以及其孔结构的变化。经过含有硫酸盐溶液的侵蚀后，混凝土强度的变化经过一个先降后升、然后再降低的过程；而经过不含硫酸盐溶液的侵蚀后，混凝土的强度持续下降。受不含硫酸根离子的酸性溶液侵蚀后，表层混凝土的孔隙结构变化较大，孔隙率增加、孔径增大。硫酸盐侵蚀产物的形成过程与混凝土的宏观性能的变化密切相关。
- 酸性介质 /
- 混凝土 /
- 侵蚀 /
- 吸水性 /
- 孔结构
Abstract: Rapid development of industry caused increase of acidic medium concentration in environments,and the deterioration of concrete performance caused by acidic attack had been paid more attention.In the present paper,five acidic solutions with different pH,different SO_4~(2-) concentration were prepared to simulate acidic rains.The strength variation,sorptivity and pore structure of concrete were measured after acidic attack for 30-150 d,in a dry-wet regimen.Results showed that,after attack of acidic solutions with SO_4~(2-),the strength of concrete reduced at firstly,then increased and reduced at last.It is possible that the reaction products of cement hydrates in concrete with SO_4~(2-) governing property variation of acid attacked concrete.However,after attack of acidic solution without SO_4~(2-),the strength decreased continuously.The reason might be the quality degradation of pore structure after pure acidic attack.
- acidic medium /
- concrete /
- attack /
- sorptivity /
- pore structure

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参考文献(11)

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