水泥混凝土TSA侵蚀研究进展

Progress in Research on the Thaumasite form of Sulfate Attack on Cement Concrete

TSA侵蚀是水泥混凝土在低温、高湿、硫酸盐与碳酸盐长期作用下发生的一种特殊的硫酸盐侵蚀形式。它直接导致水泥石中CSH凝胶体的分解,生成无任何胶结性的硅灰石膏(thaumasite)晶体,使混凝土最终变为一种白色的烂泥状混合物。综述了国内外对此类侵蚀的研究现状和进展,包括破坏机理、影响因素和防治措施等,并指出应进一步的研究方向。

Cement concrete may undergo the thaumasite form of sulfate attack when it is exposed to low temperature, high humidity, sulfate, carbonate and adequate water for a long period of time. This form of attack directly leads to the decomposition of CSH gel and formation of the non-binder thaumasite crystal in the cement paste. As a result, the attacked concrete becomes a white mushy and friable mixture. Progress and research on the form of sulfate attack on concrete is reviewed from various aspects including damage mechanism, influencing factors and preventive measures. And some aspects of research in the future are proposed.