粉煤灰掺量对氯氧镁水泥凝结时间、体积 稳定性和微观结构的影响
Effect of fly ash content on setting time, volume stability and microstructure of magnesium oxychloride cement
关键词：
氯氧镁水泥（MOC）；粉煤灰；凝结时间；抗压强度；物相组成；微观形貌
Key words：
Magnesium oxychloride cement (MOC); Fly ash; Setting time; Compressive strength; Phase composition; Microscopic morphology
刊期：
2026年第9期
DOI：
10.19761/j.1000-4637.25030119
文章编号：
基金项目：
2024年辽宁省教育厅高校基本科研项目（LJ212410146007）；2025年辽宁省科技厅项目-联合计划-博士科研启动项目（2025-BSLH-197）。
作者：
余江枫1a，王 南1a，*，李静怡1a，毕万利2，关 岩1b，2
单位：
1.辽宁科技大学 a.土木工程学院；b.材料与冶金学院，辽宁 鞍山 114051；2.辽宁科大中驰镁建材 科技有限公司，辽宁 鞍山 114051
摘要
摘 要：氯氧镁水泥（Magnesium oxychloride cement，MOC）作为低碳环保胶凝材料备受关注，但其快凝、高收缩等缺陷限制了其规模化应用。粉煤灰作为工业固废，有望改善上述材料的性能，且其资源化利用是建筑行业重要的发展方向。鉴于此，本文系统研究了粉煤灰掺量对MOC凝结时间、体积稳定性、抗压强度、物相组成、微观结构的影响。结果表明：随着粉煤灰掺量的增加，MOC的凝结时间延长，膨胀率减小，体积稳定性提高；当粉煤灰掺量≤20%时，可提高MOC的抗压强度，且掺量为10%时抗压强度最大；粉煤灰掺入后，28 d时，MOC中的主要水化产物（5·1·8相）含量略有降低，但物相组成不变；粉煤灰的掺入使5·1·8相热分解温度降低，结晶形态由针状变为凝胶状；适当掺入粉煤灰（建议10%）可以降低MOC中有害孔含量，降低总孔隙率，优化孔隙结构。研究成果可为粉煤灰的高值化利用及MOC的改性研究提供参考。
Abstract: Magnesium oxychloride cement (MOC), a low-carbon and eco-friendly cementitious material, has attracted extensive attention. However, its drawbacks such as rapid setting and high shrinkage restrict its large-scale application. As an industrial solid waste, fly ash is expected to improve the properties of MOC. Meanwhile, the resource utilization of fly ash represents an important development trend in the construction industry. In view of this, this paper investigated the effects of fly ash content on the setting time, volume stability, compressive strength, phase composition and microstructure of MOC. The results show that with the increase of fly ash content, the setting time of MOC is prolonged, the expansion rate is reduced, and the volume stability is improved. When the fly ash content is no more than 20%, the compressive strength of MOC can be increased, reaching the maximum at 10% content. After incorporation of fly ash, the content of the main hydration product 5·1·8 phase in MOC decreases slightly at 28-day, while the phase composition remains unchanged. The addition of fly ash lowers the thermal decomposition temperature of the 5·1·8 phase and changes its crystalline morphology from acicular to gel-like. Proper addition of fly ash (10% is recommended) can reduce the content of harmful pores, decrease the total porosity and optimize the pore structure of MOC. The findings can provide a reference for high-value utilization of fly ash and modification of MOC.
结论
（1）随着粉煤灰掺量的增加，MOC的凝结时间延长，膨胀率减小，体积稳定性提高。
（2）当粉煤灰掺量≤20%时，可提高MOC的抗压强度，掺量为10%时抗压强度最大；当粉煤灰掺量＞20%时，MOC的抗压强度降低。
（3）粉煤灰掺入后，28 d时，MOC中的主要强度相5·1·8相含量略有降低，但物相组成不变。粉煤灰的掺入使5·1·8相热分解温度降低，结晶形态由针状变为凝胶状。
（4）适当掺入粉煤灰（10%）可以降低MOC中有害孔含量，降低总孔隙率，优化孔隙结构。
（5）本文研发的改性MOC可以用于轻质隔墙板、建筑防火门、装饰材料等领域，具有低碳环保优势，符合绿色建材与循环经济的发展方向。此外，本研究未涉及粉煤灰改性MOC的耐久性能（如耐水性能、抗冻融性能），未来研究可以结合其他固废材料进一步优化MOC的耐久性能，探索多元固废协同改性MOC机制。
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引用本文
余江枫,王南,李静怡,等.粉煤灰掺量对氯氧镁水泥凝结时间、体积稳定性和微观结构的影响[J].混凝土与水泥制品,2026,53(9):106-111. Yu Jiangfeng,Wang Nan,Li Jingyi,et al.Effect of fly ash content on setting time, volume stability and microstructure of magnesium oxychloride cement[J].China Concrete and Cement Products,2026,53(9):106-111 (in Chinese).
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