| 摘要: |
以花岗岩石粉（GP）为掺合料，研究了其对硫氧镁（MOS）水泥耐压强度和耐水性的影响.利用X射线衍射仪（XRD）、同步综合热分析仪、扫描电镜（SEM）、压汞仪（MIP）等研究了MOS水泥的组成、微观形貌及孔结构.结果表明：当GP掺量为30%时，MOS水泥的28 d抗压强度达到最大值，为74.1 MPa；当GP掺量为40%时，MOS水泥浸水6 d时的耐水软化系数达到最大值，为1.18；浸水溶液中Mg2+和SO42-![]() ![]() 的浓度随着MOS水泥耐水软化系数的提高而降低；掺加GP的MOS水泥浸水后，体系中生成的Mg（OH）2结晶程度更高，MOS水泥的耐水性得以改善. |
| 关键词: 硫氧镁水泥 花岗岩石粉 耐水性 微观结构 水化产物 |
| DOI：10.3969/j.issn.1007-9629.2022.08.001 |
| 分类号:TU528.01 |
| 基金项目:辽宁科技大学服务地方经济发展项目（LKDFW201802）；国家自然科学基金资助项目（51778101） |
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| Effect of Granite Powder on Compressive Strength and Water Resistance of Magnesium Oxysulfate Cement |
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JIN Kairong1, XU Xingxing1, CHEN Xiaoyang2, BI Wanli1,3, LI Mengqiang4
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1.College of Materials and Metallurgy， University of Science and Technology Liaoning， Anshan 114051， China;2.College of Chemical Engineering， University of Science and Technology Liaoning， Anshan 114051， China;3.Research Institution of KedaFengchi Magnesium Building Materials， University of Science and Technology Liaoning， Anshan 114051， China;4.China Magnesite& Material Association， Beijing 100049， China
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| Abstract: |
The effect of granite powder（GP） as a mixed material on the compressive strength and water resistance of magnesium oxysulfate （MOS）cement was investigated.The composition， microstructure， and pore structure of modified MOS cement were characterized by mercury porosimeter（MIP）， X-ray diffraction（XRD）， simultaneous comprehensive thermal analyzer， and scanning electron microscope（SEM）. The result shows that when the granite powder content is 30% and 40%， the 28 d compressive strength and the 6 d water resistance softening coefficient of MOS can reach the maximum values， to be 74.1 MPa and 1.18， respectively. The concentration of the Mg2+ and SO42-![]() ![]() in the solution decreases with the increase of MOS water resistance softening coefficient. After soaking in water， the Mg（OH）2 generated with a higher degree of crystallinity in MOS cement containing GP， and this can conductive to the water resistance of MOS cement to a certain extent. |
| Key words: magnesium oxysulfate（MOS） cement granite powder（GP） water resistance microstructure hydration product |
