碱－碳酸盐岩反应的膨胀机理

EXPANSION MECHANISM OF ALKALICARBONATE ROCK REACTION

应用分析电镜／能谱仪（ＡＥＭ／ＥＤＳ）和薄膜试样分析技术，研究了与碱反应前后活性碳酸盐岩的结构和组成变化。根据研究结果把碱－碳酸盐岩反应膨胀机理归为：固相产物吸水肿胀和产物水镁石和方解石晶体生长和重排产生的结晶压力。膨胀值的大小取决于产物层的表观体积。

The changes in the microstructure and composition of the reactive carbonate rocks beforeand after reacting with alkali were studied using AEM/EDS and thin film analytic technique. Based onthe analytic results, it is concluded that the expansion mechanism of alkali-carbonate rock reaction isas follows: solid products will swell due to absorption of water, and growth and rearrangement ofbrucite and calcite crystals will produce crystalization pressure. The value of expansion depends on theapparent volume of the product layer.