对西部某水坝廊道运行6年的混凝土受腐蚀状况进行调研、 取样，采用XRD、SEM、EDAX和激光Raman光谱等方法进行分析.结果表明，低温、高湿、硫 酸盐和碳酸盐长期共同作用下混凝土的腐蚀产物是由硅灰石膏、钙矾石、石膏和方解石组成 的一种稀泥状混合物.证实了在我国西部水工环境下混凝土可能发生TSA硫酸盐侵蚀，并探讨 了这种侵蚀的发生机理.
A site investigation was made on one deteriorated concrete with 6 year s age,and this concrete component was located in one tunnel of one concrete dam in Western China.Some samples were taken from the attacked concrete and were a nalyzed with XRD,SEM-EDAX and Laser Raman Spectroscopy methods.As a result,it is shown that a mushy mixture consisting of thaumasite,ettringite,gypsum and calcite occurs in the residual concrete exposed to low temperature,high humidit y,sulfate and carbonate for a long time.It is validated that the thaumasite fo rm of sulfate attack may occur in hydraulic concrete structures in Western China .In addition,the corrosion mechanism is also discussed.
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