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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (1): 336-345.DOI: 10.16552/j.cnki.issn1001-1625.2025.0758

• 道路材料 • 上一篇    下一篇

粉煤灰-矿渣-赤泥基胶凝材料固化土强度和微观机理研究

岳鹏飞1(), 郭思标1, 丁秀娟1, 王玉松1, 王大周1, 胡悦1, 张蓉蓉2(), 章纲2, 丁金孟2   

  1. 1.淮南哈米文化产业发展有限公司,淮南 232001
    2.安徽理工大学土木建筑学院,淮南 232001
  • 收稿日期:2025-07-30 修订日期:2025-09-03 出版日期:2026-01-20 发布日期:2026-02-10
  • 通信作者: 张蓉蓉,博士,副教授。E-mail:zrrah187@163.com
  • 作者简介:岳鹏飞(1994—),男,高级工程师。主要从事房地产开发及建筑施工研究。E-mail:975777165@qq.com
  • 基金资助:
    企业委托项目(HX2024032870)

Strength and Microscopic Mechanism of Fly Ash-Slag-Red Mud-Based Cementitious Materials Solidified Soil

YUE Pengfei1(), GUO Sibiao1, DING Xiujuan1, WANG Yusong1, WANG Dazhou1, HU Yue1, ZHANG Rongrong2(), ZHANG Gang2, DING Jinmeng2   

  1. 1. Huainan Hami Cultural Industry Development Co. ,Ltd. ,Huainan 232001,China
    2. School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China
  • Received:2025-07-30 Revised:2025-09-03 Published:2026-01-20 Online:2026-02-10

摘要:

为解决路基加固工程中传统胶凝材料造价高、生产过程排碳量高的问题,并实现工业固废资源化和高值化利用,以氢氧化钠作为碱激发剂,制备粉煤灰-矿渣-赤泥三元复合胶凝材料,通过无侧限抗压强度(UCS)试验,研究固废基胶凝材料配合比和氢氧化钠掺量对固化土7 d UCS的影响,并利用SPSS软件对UCS结果进行相关性分析,结合SEM-EDS和XRD手段探讨固废基胶凝材料对土体的固化作用机理。结果表明:不同配合比的固化土试样呈现出劈裂破坏、剪切破坏及拉剪复合破坏三种类型;固废基原材料和碱激发剂间的交互作用对固化土UCS有显著影响,当粉煤灰、矿渣、赤泥质量比为1∶3∶1时,固化土7 d UCS最高,可达1.795 MPa;氢氧化钠掺量与UCS之间存在显著的正相关性,相关系数达到0.76;随着固化土内部水化反应的进行,大量生成的水化硅酸钙、水化铝酸钙凝胶相包裹土颗粒并填充颗粒间孔隙,从而显著提升固化土的强度;随着氢氧化钠掺量的增加,其对水化反应的促进作用更为显著,固化土内部微孔和小孔之和的占比逐渐增加,中孔和大孔之和的占比则逐渐降低。

关键词: 固废基胶凝材料, 固化土, 无侧限抗压强度, 相关性分析, 微观形貌

Abstract:

In order to solve the problems of high cost and high carbon emission in the production process of traditional cementitious materials in subgrade reinforcement engineering, and to realize the recycling and high-value utilization of industrial solid waste, sodium hydroxide was used as alkali activator to prepare fly ash-slag-red mud ternary composite cementitious materials. Through the unconfined compressive strength ( UCS ) test, the effect of mix ratio of solid waste-based cementitious materials and sodium hydroxide content on the 7 d UCS of solidified soil was studied. The correlation analysis of UCS results was carried out by SPSS software, and the solidification mechanism of solid waste-based cementitious materials on soil was discussed by means of SEM-EDS and XRD. The results show that the solidified soil specimens with different mix ratios show three types of splitting failure, shear failure and tensile-shear composite failure. The interaction between solid waste-based raw materials and alkali activator has a significant effect on the UCS of solidified soil. When the mass ratio of fly ash, slag, and red mud is 1∶3∶1, the 7 d UCS of solidified soil is the highest, up to 1.795 MPa. There is a significant positive correlation between sodium hydroxide content and UCS, and the correlation coefficient reaches 0.76. With the hydration reaction in the solidified soil, a large number of hydrated calcium silicate and hydrated calcium aluminate gel phases is generated to wrap the soil particles and fill the pores between the particles, thereby significantly improving the strength of solidified soil. With the increase of sodium hydroxide content, its promotion effect on the hydration reaction is more significant. The proportion of the sum of micropores and small pores in solidified soil gradually increases, and the proportion of the sum of mesopores and macropores gradually decreases.

Key words: solid waste-based cementitious material, solidified soil, unconfined compressive strength, correlation analysis, microscopic morphology

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