电化学除盐对混凝土微观结构的影响

成立; 黄绪泉; 王小萍

doi:10.11835/j.issn.1674-4764.2008.03.025

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电化学除盐对混凝土微观结构的影响

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- 电化学除盐对混凝土微观结构的影响
- Influence of Electrochemical Chloride Extraction on the Microstructure of Desalinated Pastes of Concrete
- 土木与环境工程学报（中英文） 2008年30卷第3期
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  湖北省教育厅科研项目
- DOI：10.11835/j.issn.1674-4764.2008.03.025
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- 纸质出版：2008
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成立, 黄绪泉, 王小萍. 电化学除盐对混凝土微观结构的影响[J]. 土木与环境工程学报（中英文）, 2008,30(3).

CHENG Li, HUANG Xu-quan, WANG Xiao-ping. Influence of Electrochemical Chloride Extraction on the Microstructure of Desalinated Pastes of Concrete[J]. Journal of Civil and Environmental Engineering, 2008, 30(3).
成立, 黄绪泉, 王小萍. 电化学除盐对混凝土微观结构的影响[J]. 土木与环境工程学报（中英文）, 2008,30(3). DOI： 10.11835/j.issn.1674-4764.2008.03.025.

CHENG Li, HUANG Xu-quan, WANG Xiao-ping. Influence of Electrochemical Chloride Extraction on the Microstructure of Desalinated Pastes of Concrete[J]. Journal of Civil and Environmental Engineering, 2008, 30(3). DOI： 10.11835/j.issn.1674-4764.2008.03.025.

摘要

设计了一套钢筋混凝土的电化学除盐循环装置

研究了用0.001 mol/L Li2B4O7 氢氧化钙饱和溶液、氢氧化钙溶液以及蒸馏水作电解液的除盐效率

并用SEM和EDS等方法进行微观结构分析

结果表明:用0.001 mol/L Li2B4O7 氢氧化钙饱和溶液作电解液最有利于混凝土中Cl-的排除

并且经电化学除盐处理后混凝土水化产物中C-S-H凝胶分解

Ca(OH)2增多

并在孔壁形成沉淀

堵塞毛细孔

使表层混凝土孔隙率降低

而钢筋与混凝土界面Ca/Si增大。

Abstract

A set of installation is designed for electrochemical chloride extracting circularly on reinforced concrete.The removal efficiency is discussed using saturated Ca(OH)2 solution

saturated Ca(OH)2 0.001 mol/L Li2B4O7 solution and distilled water as electrolyte

respectively.And the microstructure of cement paste is analyzed by scanning electron microscopy(SEM) and energy dispersive X-ray spectroscopy(EDS).The results prove that using saturated Ca(OH)2 0.001 mol/L Li2B4O7 solution as electrolyte is more favorable to removing chloride in concrete.Treated by electrochemical desalination

the hydrated product C-S-H resolves and Ca(OH)2 in the concrete increases

too.It deposites on the wall of pores and fills in pores

and then causes the porosity to decrease

while the ratio of Ca /Si of C-S-H increases in the interface between the steel and the concrete.

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