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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (1): 112-122.DOI: 10.16552/j.cnki.issn1001-1625.2025.0735

• 水泥混凝土 • 上一篇    下一篇

原料摩尔比对改性硫氧镁基胶凝材料宏观性能的影响

邱军付1(), 张瑞峰1, 王正华1, 舒春雪1, 张佳阳1, 贺鑫鑫2, 李雨洋1   

  1. 1.北京建筑材料科学研究总院有限公司,材料循环低碳再生全国重点实验室,北京 100041
    2.北京市建筑工程研究院有限责任公司,北京 100039
  • 收稿日期:2025-07-24 修订日期:2025-08-18 出版日期:2026-01-20 发布日期:2026-02-10
  • 作者简介:邱军付(1977—),男,博士,高级工程师。主要从事绿色建材开发和固废资源化利用的研究。E-mail: 82324545@qq.com
  • 基金资助:
    国家重点研发计划(2023YFE0199600)

Effect of Raw Material Molar Ratio on Macro-Properties of Modified Magnesium Oxysulfate Cementitious

QIU Junfu1(), ZHANG Ruifeng1, WANG Zhenghua1, SHU Chunxue1, ZHANG Jiayang1, HE Xinxin2, LI Yuyang1   

  1. 1. State Key Laboratory of Materials Low-Carbon Recycling,Beijing Building Materials Academy of Scientific Research Co. ,Ltd. ,Beijing 100041,China
    2. Beijing Building Construction Research Institute Co. ,Ltd. ,Beijing 100039,China
  • Received:2025-07-24 Revised:2025-08-18 Published:2026-01-20 Online:2026-02-10

摘要:

为探究氧硫比和水硫比对改性硫氧镁基胶凝材料宏观性能的影响及机理,通过X射线荧光分析(XRF)、水化热分析、X射线衍射分析(XRD)和扫描电子显微镜(SEM)等手段,研究原料氧硫比M=nα-MgO)∶n(MgSO4)和水硫比H=n(H2O)∶n(MgSO4)对改性硫氧镁基胶凝材料水化产物、力学性能、耐水性等性能的影响规律。结果表明:固定水硫比为20∶1、氧硫比为11∶1时,硫氧镁基胶凝材料的力学性能最优;固定氧硫比为8∶1,当水硫比为18∶1时,硫氧镁基胶凝材料的力学性能最优。随着氧硫比的增加,水化反应产生5·1·7相晶体的质量分数在80%以上,针棒状5·1·7相晶体交织成网状结构,和体系中未反应的MgO一同填充样品孔隙,使样品结构更加密实,改善了体系的力学性能,氧硫比为11∶1的硫氧镁基胶凝材料相较于氧硫比为7∶1的硫氧镁基胶凝材料28 d抗折强度提升51.1%,28 d抗压强度提升34.8%;水硫比的增加会导致体系中原本起到填充作用的MgO水化生成Mg(OH)2,产生体积膨胀,导致硫氧镁基胶凝材料力学性能降低。

关键词: 改性硫氧镁基胶凝材料, 轻烧氧化镁, 5·1·7相晶体, 氧硫比, 水硫比

Abstract:

To investigate the effects of the oxygen-sulfur ratio and water-sulfur ratio on the macro-properties and mechanisms of modified magnesium oxysulfate cementitious, the influence patterns of the raw material oxygen-sulfur ratio (M=nα-MgO)∶n(MgSO4)) and water-sulfur ratio (H=n(H2O)∶n(MgSO4)) on the hydration products, mechanical properties, and water resistance of MOS were studied through XRF, hydration heat analysis, XRD, and SEM. The results indicate that: with the water-sulfur ratio fixed at 20∶1 and the oxygen-sulfur ratio fixed at 11∶1, the magnesium oxysulfate cementitious exhibits optimal mechanical properties; with the oxygen-sulfur ratio fixed at 8∶1 and the water-sulfur ratio fixed at 18∶1, the mechanical properties of magnesium oxysulfate cementitious are optimized. An increase in oxygen-sulfur ratio promotes the formation of over 80% by mass of the 5·1·7 phase, where needle-like 5·1·7 crystals interweave into a network structure. These crystals, along with unreacted MgO in the system, fill the pores in the sample, resulting in a denser structure and improved mechanical properties. Compared to the magnesium oxysulfate cementitious with an oxygen-sulfur ratio of 7∶1, the 28 d flexural strength and 28 d compressive strength of the cementitious with an oxygen-sulfur ratio of 11∶1 increase by 51.1% and 34.8%, respectively. Conversely, an increase in water-sulfur ratio leads to the hydration of MgO (which originally acts as a filler) into Mg(OH)?, causing volumetric expansion and a reduction in mechanical performance of magnesium oxysulfate cementitious.

Key words: modified magnesium oxysulfate cementitious, light-burned magnesia, 5·1·7 phase crystal, oxygen-sulfur ratio, water-sulfur ratio

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