The reaction mechanism between MgO and microsilica at room temperature

Abstract

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 composition 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 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.

Keywords

MgO / microsilica / magnesium silicate hydrate gel (M-S-H)

References

[1] Lv Ф И.. Technology of Press and Vapor Materials [M], 1985 Beijing: China Construct Industry Press.

[2] Runzhang Yuan. Cementious Materials [M], 1990 Wuhan: Wuhan University of Technology Press.

[3] Wunder Brnd. Antigorite: High-pressure Stability in the System MgO−SiO ₂−H₂O(MSH) [M]. Lithos, 1997, 41: 213-227.

[4] Mitsuda Taguchi H. Formation of Magnesium Silicate Hydrate and Its Crystallization to Talc[J]. Cement and Concrete Research, 1980, 2: 477-485.