The Reaction Mechanism between MgO and Microsilica at Room Temperature

It was proved that MgO and MicroSilica can react at room temperature, giving a hardened product primarily comprised of Mg（OH）2 and Magnesium Silicate Hydrate （M-S-H）. The reaction ratio and process and the chemical composion of M-S-H were studied and analyzed by QXRD and DTA-TG. The experimental results indicate that much Mg（OH）2 and less M-S-H were formed at early period. After 7 days there is no change in the quantity of Mg（OH）2, while M-S-H was increased slowly. The chemical composion of M-S-H would vary with the mix proportion in the hydration process , but M 1.32SH 2.37 is finally the approximate form.