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苏打渣与粉煤灰稳定土的力学性能及作用机理

Mechanical properties and mechanisms of soda residue and fly ash stabilized soil.

作者信息

Yang Tianfeng, Huang Bo, Zhan Chunan, Jiang Cheng, Zhang Liping, Zhao Xiaoqing, Zhao Mingrui

机构信息

School of Civil and Ocean Engineering, Jiangsu Ocean University, Jiangsu, 222005, China.

CNNC Ecology Environment Co., Ltd, Jiangsu, 222000, China.

出版信息

Sci Rep. 2025 Jan 7;15(1):1103. doi: 10.1038/s41598-024-84170-0.

DOI:10.1038/s41598-024-84170-0
PMID:39774174
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11707069/
Abstract

To improve the utilization rates of soda residue (SR) and fly ash (FA), reduce environmental pollution, and enhance the mechanical properties of marine clay (MC), this study proposes mixing SR, FA, and MC with cement and /or lime to prepare soda residue-fly ash stabilized soil (SRFSS). Using an orthogonal design for the proportions, the study analyzes the compaction performance, unconfined compressive strength (UCS), and shear strength of SRFSS. The influence of various factors on the mechanical properties of SRFSS was investigated through range and variance analyses. The mechanical mechanism was revealed from the perspectives of grading and cementation. The results indicate that SR and FA significantly impact the mechanical properties of SRFSS. The range and variance analysis results are consistent: SR content of 30% and 70% has the most significant impact on compaction performance and UCS, respectively, while 20% FA content has the greatest effect on shear strength. The recommended base proportion is 70% SR + 20% FA + 10% MC. The gradation and cementitious properties jointly influence the mechanical performance and microstructure of SRFSS, G8 has the lowest planar porosity, at only 0.89%. The calcium (Ca) content in SRFSS specimens with different proportions shows significant variation, from 5.0 to 53.6 wt%, while the silicon (Si)/Al ratio (0.76-2.73) shows relatively small fluctuations. The primary hydration products include calcium hydroxide (Ca(OH)), calcium silicate hydrate (C-S-H), and ettringite (AFt).

摘要

为提高碱渣（SR）和粉煤灰（FA）的利用率，减少环境污染，增强海相黏土（MC）的力学性能，本研究提出将SR、FA和MC与水泥和/或石灰混合制备碱渣-粉煤灰稳定土（SRFSS）。通过正交设计确定配比，分析了SRFSS的压实性能、无侧限抗压强度（UCS）和抗剪强度。通过极差分析和方差分析研究了各因素对SRFSS力学性能的影响。从级配和胶结角度揭示了其力学机理。结果表明，SR和FA对SRFSS的力学性能有显著影响。极差分析和方差分析结果一致：SR含量为30%和70%时分别对压实性能和UCS影响最为显著，而FA含量为20%时对抗剪强度影响最大。推荐基层配比为70%SR + 20%FA + 10%MC。级配和胶凝性能共同影响SRFSS的力学性能和微观结构，G8的平面孔隙率最低，仅为0.89%。不同配比的SRFSS试件中钙（Ca）含量变化显著，为5.0至53.6 wt%，而硅（Si）/铝（Al）比（0.76 - 2.73）波动相对较小。主要水化产物包括氢氧化钙（Ca(OH)）、水化硅酸钙（C-S-H）和钙矾石（AFt）。

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