Thaumasite formation in a tunnel of Bapanxia Dam in Western China

Journal Article · Sat Apr 15 04:00:00 EDT 2006 · Cement and Concrete Research

DOI:https://doi.org/10.1016/J.CEMCONRES.2005.1· OSTI ID:20793284

Baoguo, Ma ^[1]; Xiaojian, Gao ^[1]; Byars, Ewan A ^[2]; Qizhi, Zhou ^[3]

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1. Key Laboratory of Silicate Materials Science and Engineering of Ministry of Education, Wuhan University of Technology, Wuhan 430070, (China)
2. CMRU, Department of Civil and Structural Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD (United Kingdom)
3. Department of Engineering Materials, University of Sheffield, Mappin Street, Sheffield S1 3JD (United Kingdom)

A site investigation and sampling was carried out on a sulfate-attacked concrete structure in Bapanxia Hydraulic Power Plant in Western China. The concrete had been exposed to ground water containing substantial concentrations of salts (SO{sub 4} {sup 2-}, CO{sub 3} {sup 2-} and Cl{sup -}) for about 6 years and was analyzed with X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), laser-Raman spectroscopy and Fourier transform infrared (FTIR) spectroscopy. It is shown that a white mushy mixture consisting of thaumasite, ettringite, gypsum and calcite is present in the residual concrete. This paper reports the first instance of the thaumasite form of sulfate attack of concrete in China.

• OSTI ID: 20793284
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Journal Issue: 4 Vol. 36; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCITE
CHINA
CONCRETES
DAMS
FOURIER TRANSFORMATION
GROUND WATER
GYPSUM
INFRARED SPECTRA
PYRAZOLINES
RAMAN SPECTROSCOPY
SCANNING ELECTRON MICROSCOPY
SULFATES
TUNNELS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY