关键词: 碳硫硅钙石;钙矾石;固溶体;间隙

Abstract: There has been much reported recently on the occurrence of thaumasite of sulfate attack in concrete in many countries.Research has shown that this process can be accelerated by aluminum phases and form thaumasite-ettringite solid solution, but the specific mechanism is uncertain.A series of solid solution phases have been prepared and analysed by XRD, SEM-EDS and FTIR.Results indicate: thaumasite/solid-solution can also form at 40 ℃;thaumasite types and ettringite types solid solution are formed in all samples;the gap in the a-dimensions is increased with the increasing of temperature, the gap in the a-dimensions is 1.1076-1.1182 nm at 20 ℃ and the gap is 1.1069-1.1189 nm at 40 ℃;the morphologies is more long and thin when the temperature increased.

Key words: thaumasite;ettringite;solid solution;gap