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Journal of Chemistry
Volume 2017 (2017), Article ID 8698759, 8 pages
https://doi.org/10.1155/2017/8698759
Research Article

The Sulphate Effect on Lijiaxia Concrete Dam (China) Gallery

1School of Earth Science and Engineering, Hohai University, Nanjing 210098, China
2Yellow River Upstream Hydropower Limited Liability Company, Xining 810008, China

Correspondence should be addressed to Hu Zheng

Received 27 April 2017; Accepted 3 August 2017; Published 3 October 2017

Academic Editor: Petros Gikas

Copyright © 2017 Xufen Zhu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The concrete degradation is one of the most serious problems for a dam construct during the normal operation, which determines the dam service life. Hence, it is very important to reduce the extent of the dam concrete degradation for the safety of the dam normal operation. Here, Lijiaxia hydroelectric station is taken as an example, and a comprehensive method to assess the sulphate effect on dam gallery is proposed. Eleven samples in total were taken from three difference locations by the drill bore. The microstructural investigations including X-ray fluorescence spectrometry (XRF), X-ray diffraction (XRD), scanning electron microscope (SEM), and energy dispersive spectroscopy (EDS) were conducted to assess the sulphate attack and the degradation degree. Meanwhile, the water chemical analysis was applied to reveal the mechanism of concrete degradation. The experimental and analysis results indicate that the concrete degradation degree varies with the location of the samples. The components of the concrete change and the content of SO3 increase dramatically during degradation. Moreover, the mineral facies of the concrete change correspondingly, with the cement paste substituted by the calcite, calcium vitriol, and gypsum. The reinforcement and precaution measures are suggested based on the results of the degradation assessment.