Influence of Molar Ratio on Properties of Magnesium Oxysulfate Cementitious Materials
BA Mingfang
ZHU Jiezhao
XUE Tao
LIU Junzhe
Abstract：Effects of n (MgO)/n (MgSO4),n (H2 O)/n (MgSO4) on the properties and micro-structural mechanism of magnesium oxysulfate(MOS) cemented materials were investigated.The results show that the most optimal mechanical properties are obtained when n(H2O)/n(MgSO4) is fixed to be 19 ∶ 1 and n(MgO)/n(MgSO4) equals to 14 ∶ 1.Micro-structural analysis shows that once n(MgO)/n(MgSO4) is over 14 ∶ 1,the content of residual MgO and Mg(OH)2 in hardened paste of MOS will increase,which will loosen the structure of the hardened MOS and reduce its mechanical properties;With the increase of n(H2O)/n(MgSO4) the formation of basic-magnesium-sulfate phase in hardened MOS will be retarded,resulting in a large amount of pores in microstructure and decrease of mechanical properties,when n(MgO)/n(MgSO4) is 14 ∶ 1.
Keywords：magnesium oxysulfate cemented materiallightly burned magnesiaseven-water magnesium sulfatemolar ratio
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 124-130 )