Inhibiting Effect of Admixtures on TSA of Concrete

YANG Chang hui; BAN Ke cheng; LIU Ben wan

doi:10.11835/j.issn.1674-4764.2011.02.025

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Inhibiting Effect of Admixtures on TSA of Concrete

更新时间：2023-11-28

- Inhibiting Effect of Admixtures on TSA of Concrete
- Journal of Civil and Environmental Engineering Vol. 33, Issue 2, Pages: 126-131(2011)
- 作者机构：
  
  重庆大学材料科学与工程学院,重庆,400045
- 作者简介：
- 基金信息：
- DOI：10.11835/j.issn.1674-4764.2011.02.025
  CLC：
- Published：2011
- 稿件说明：
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YANG Chang hui, BAN Ke cheng, LIU Ben wan. Inhibiting Effect of Admixtures on TSA of Concrete[J]. Journal of Civil and Environmental Engineering, 2011, 33(2): 126-131.
DOI：

YANG Chang hui, BAN Ke cheng, LIU Ben wan. Inhibiting Effect of Admixtures on TSA of Concrete[J]. Journal of Civil and Environmental Engineering, 2011, 33(2): 126-131. DOI： 10.11835/j.issn.1674-4764.2011.02.025.

摘要

研究了掺加化学外加剂的水泥净浆试件在（5±2）℃、质量分数5%的硫酸镁溶液中浸泡300d的外观变化、强度发展及侵蚀产物

采用X射线衍射（XRD）、傅立叶转换红外光谱（FTIR）等方法分析了侵蚀产物的组成.结果表明：甲酸钙能延缓水泥石发生TSA腐蚀

但不能阻止TSA发生

在03%~07%范围内

随着甲酸钙掺量的增加

水泥石抗TSA腐蚀的能力增强.硝酸钡能有效抑制水泥石中碳硫硅钙石的生成

原因是硝酸钡能结合生成碳硫硅钙石所需的SO42-

从而降低了水泥石发生TSA腐蚀的程度.硝酸钡掺量在1%左右时

水泥石抗TSA性能较好.

Abstract

The cement paste added with chemical admixtures is kept out (5±2)℃

5% in mass MgSO4 corrosion solution in 300 d of immersion. Its visual appearance

compressive strength and erosion products are studied. Its erosion products are analyzed by the way of Xray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). It shows that the calcium formate can delay the TSA of harden cement paste to occur

but can not stop the development of TSA. The resistance of mortar to TSA increases with the raise of calcium formate in the range of 03% to 07%. The reason why barium nitrate can inhibit the formation of thaumasite is that it can combine with SO2-4 which is essential for the forming of thaumasite. Thus

the TSA of mortar is reduced in degree. The harden cement paste shows good resistance to TSA when barium nitrate is approximately 1% of cement.

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