土工基础

土工基础 ›› 2022, Vol. 36 ›› Issue (6): 977-979.

• 测试技术 • 上一篇    下一篇

稻壳灰水泥土力学性能及微观机理分析

杨 星，方亚男，刘巨强，张 鑫，岳雨薇   

  1. （湖北工业大学土木建筑与环境学院，武汉 430068）
  • 收稿日期:2021-06-03 修回日期:2021-06-11 出版日期:2022-12-31 发布日期:2022-12-28
  • 通讯作者: 方亚男（1996-），男，研究生,研究方向为固废利用。
  • 作者简介:杨星（1996-），女，研究生，研究方向为固废利用。
  • 基金资助:
    国家自然科学基金（51778217），湖北省中央引导地方科技发展专项(2019ZYYD053，2018ZYYD005)，武汉市应用基础前沿专项（2020020601012278），湖北省创新群体项目（2020CFA046）

Mechanical Properties and Microscopic Mechanism of Rice Husk Ash-Cement Improved Mucky Soft Soils

YANG Xing, Fang Yanan, LIU Juqiang, ZHANG Xin， YUE Yuwei   

  1. (School of Civil Architecture Engineering and Environment, Hubei University of Technology, Wuhan 430068)
  • Received:2021-06-03 Revised:2021-06-11 Online:2022-12-31 Published:2022-12-28

摘要： 利用稻壳灰和水泥复合改良淤泥土，研究不同养护龄期下，稻壳灰水泥土的击实特性、无侧限抗压强度、固结性能及微观形貌。结果表明：①稻壳灰水泥土最大干密度为1.35 g·cm-3，最佳含水率为38.31%，相较于淤泥土，干密度降低，含水率增加。②稻壳灰水泥土强度远远大于淤泥土，约是淤泥土的3~3.5倍，有良好的固化效果。③稻壳灰水泥土压缩性降低，且随龄期增加，压缩性进一步降低，有良好的压缩性能。④稻壳灰水泥土随养护龄期增加，凝胶物质胶结程度更好，胶凝体系更成熟，水化硅酸钙凝胶胶结土体，土体密实度提高，稻壳灰水泥土强度得到提升。


关键词: 稻壳灰, 水泥, 无侧限抗压强度, 固结试验, 微观形貌

Abstract: The paper presents the use of the rice husk ash and the cement to improve the mucky soft soils. The compactive properties, the unconfined compressive strength, the consolidation properties and the micromorphology of the rice husk ash and the cement treated soft soil samples under different curing ages were systematically studied. The results show that, compared with the untreated mucky soft soil samples, the optimal moisture content of the rice husk ash and the cement treated soil samples increases and the maximum dry density decreases. The strength of the treated soil samples is much greater than that of the untreated samples and the treated soil samples have good curing effect and good compression performance. When cured for 28 days, the cementing system of the rice husk ash-cement treated soil samples is mature, and the soil sample is cemented by the hydrated calcium silicate gel. The soil compactive behavior is improved, and the strength of the rice husk ash soil-cement treated soil samples is also improved.

Key words: Rice Husk Ash, Cement, Unconfined Compressive Strength, Consolidation Test, Micro Morphology

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