| 摘要: |
| 为提高硫氧镁水泥的耐水性，在硫氧镁水泥中掺入轻质碳酸镁或菱镁矿精矿粉，研究其对硫氧镁水泥浸水前后抗压强度、水化产物的物相组成及含量、微观结构的影响.结果表明：轻质碳酸镁、菱镁矿精矿粉的掺入，均有利于硫氧镁水泥耐水性的提高，当其掺量为10%时，试件的抗压强度分别提高至77.9、76.7 MPa，软化系数分别提高了26.3 %、15.0 %；随着轻质碳酸镁或菱镁矿精矿粉掺量大、养护龄期的延长，MgO含量降低，硫氧镁水泥的安定性问题得到了有效缓解；轻质碳酸镁、菱镁矿精矿粉与硫氧镁水泥中的剩余MgO反应形成了MgO-CO2-H2O体系，该体系具有良好的耐水性，并使基体致密，从而提高了硫氧镁水泥的抗压强度与耐水性. |
| 关键词: 硫氧镁水泥 轻质碳酸镁 菱镁矿 水化产物 耐水性 |
| DOI：10.3969/j.issn.1007-9629.2022.02.011 |
| 分类号:TU528.55 |
| 基金项目:辽宁科技大学校基金资助项目（2018FW02） |
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| Effect of Magnesium Carbonate Minerals on Water Resistance of Magnesium Oxysulfate Cement |
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HU Zhiqi1, GUAN Yan1,2, BI Wanli1,2,3
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1.College of Materials and Metallurgy， University of Science and Technology Liaoning， Anshan 114051， China;2.Liaoning Province Magnesium Resources and Magnesium Materials Engineering Technology Research Center， Anshan 114051， China;3.Research Institution of Keda Fengchi Magnesium Building Materials， University of Science and Technology Liaoning， Anshan 114051， China
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| Abstract: |
| In order to improve the water resistance of magnesium oxysulfate （MOS） cement， hydromagnesite or magnesite was added into MOS cement. The effects of hydromagnesite and magnesite on the compressive strength， phase composition and content of hydration product， and microstructure of MOS cement were analyzed. The results show that the addition of hydromagnesite and magensite is conducive to the water resistance of MOS cement. When the dosage of hydromagnesite or magensite is 10 %， the compressive strength of MOS cement increase to 77.9 MPa and 76.7 MPa， and the softening coefficient increases by 26.3% and 15.0%， respectively. With the increase of the dosage of hydromagnesite or magnesite and the extension of curing age， the content of MgO decreases， and the soundness problem of MOS cement is effectively alleviated. Hydromagnesite and magnesite can react with the residual MgO in MOS cement to form the MgO-CO2-H2O system， which is stable in water and compacts the matrix， thus improving the compressive strength and water resistance of MOS cement. |
| Key words: magnesium oxysulfate cement hydromagnesite magnesite hydration product water resistance |
