Deterioration of concrete in railway tunnel suffering from sulfate attack
- 266 Downloads
For the sake of understanding the deterioration behavior of concrete in actual railway tunnel structures subjected to aggressive sulfate medium in practice, detailed field investigations and tested analysis on sprayed concrete linings of approximately 40-year-old railway tunnels in environments containing sulfate ion were carried out, respectively. The results show that the deterioration of concretes in the investigated area is serious, which involves complicated physicochemical process between the sulfate salt and concrete. Among them, the secondary sulfate minerals such as gypsum formation under very high concentration sulfate ion condition by accumulating and evaporation process dominate, followed by the crystallization of sulfate salt and formation of thaumasite.
Key wordssulfate attack concrete railway tunnel secondary sulfate minerals salt crystallization
Unable to display preview. Download preview PDF.
- MEHTA P K. Sulfate attack on concrete—A critical review [C]// SKALNY J. Material Science of Concrete, Vol. III. American Ceramic Society, Westerville, USA, 1992: 105–130.Google Scholar
- HEARN N, YOUNG J F. w/c ratio, porosity and sulfate attack—A review [C]// MARCHAND J, SKALNY J. Materials Science of Concrete: Sulfate Attack Mechanisms. The American Ceramic Society, Westerville, USA, 1999: 189–205.Google Scholar
- FAMY C, TAYLOR H F W. Ettringite in hydration of Portland cement concrete and its occurrence in mature concretes [J]. ACI Mater J, 2001, 98: 350–6.Google Scholar
- Thaumasite Expert Group. The thaumasite form of sulfate attack: Risks, diagnosis, remedial works and guidance on new construction [R]. London: DETR, 1999.Google Scholar
- LIU Ya-hui, SHEN Chun-ni, FANG Xiang-wei, XU Shou-bin, ZHANG Wei. Effects of solution concentration and temperature on deterioration rate of concrete by sulfate attack [J]. Joural of Chongqi Architecture University, 2008, 30(1): 129–135. (in Chinese)Google Scholar