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首页 > 过刊浏览>2022年第25卷第8期 >767-772. DOI:10.3969/j.issn.1007-9629.2022.08.001
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花岗岩石粉对硫氧镁水泥耐压强度和耐水性的影响
作者:
作者单位:

1.辽宁科技大学 材料与冶金学院，辽宁 鞍山 114051;2.辽宁科技大学 化工学院，辽宁 鞍山 114051;3.辽宁科技大学 科大峰驰镁建材研究院，辽宁 鞍山 114051;4.中国菱镁行业协会，北京 100049

作者简介:

靳凯戎（1994—），男，河南平顶山人，辽宁科技大学硕士生.E-mail：yefeng981904494@163.com

通讯作者:

毕万利（1963—），男，辽宁鞍山人，辽宁科技大学教授，硕士生导师，硕士.E-mail：asbwl@126.com

中图分类号:

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）


Effect of Granite Powder on Compressive Strength and Water Resistance of Magnesium Oxysulfate Cement
Author:
Affiliation:

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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    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.

    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.

    表 4 MOS水泥标准养护28 d时的孔径分布Table 4 Pore distribution of MOS cement standard curing for 28 d
    表 1 LBM和GP的化学组成Table 1 Chemical compositions of LBM and GP
    表 2 MOS水泥中5·1·7相和Mg（OH）2的晶体尺寸Table 2 5·1·7phase and Mg（OH）2 crystal size of MOS cement nm
    图1 LBM和GP的粒度分布Fig.1 Particle size distribution of LBM and GP
    图2 掺入GP后MOS水泥的抗压强度和耐水软化系数Fig.2 Compressive strength and water resistance softening coefficient of MOS cement with GP
    图3 不同GP掺量的MOS水泥标准养护28 d和浸水6 d时的XRD图谱Fig.3 XRD patterns of MOS cement with different GP contents under standard curing for 28 d and soaking in water for 6 d
    图4 不同GP掺量的MOS水泥标准养护28 d和浸水6 d时的TG-DTG曲线Fig.4 TG-DTG curves of MOS cement with different GP contents under standard curing for 28 d and soaking in water for 6 d
    图5 在不同养护条件下MOS水泥试件C0和C40的SEM照片Fig.5 SEM images of MOS cement specimen C0 and C40 under different curing conditions
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靳凯戎,许星星,陈啸洋,毕万利,李孟强.花岗岩石粉对硫氧镁水泥耐压强度和耐水性的影响[J].建筑材料学报,2022,25(8):767-772

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  • 收稿日期:2021-06-01
  • 最后修改日期:2021-08-08
  • 在线发布日期: 2023-09-15
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