Influence of silica fume and carbide slag on waste mud soil under small strain: Dynamic characteristics and microscopic mechanism

IF 8.6 2区工程技术 Q1 ENERGY & FUELS

Sustainable Materials and Technologies Pub Date : 2025-05-27 DOI:10.1016/j.susmat.2025.e01464

Na Li , Jingyi Lin , Erlu Wu , Ping Jiang , Zhicheng Zhang , Junjie Wang , Wei Wang

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引用次数: 0

Abstract

Silica fume and carbide slag can be used to modify waste mud soil (WMS), which can not only improve the mechanical properties of WMS, but also broaden resource utilization ways of silica fume and carbide slag. For that, in this paper, WMS was modified by adopting 8 % carbide slag and silica fume with different dosages (0, 3 %, 5 %, 7 %, 9 %, and 11 %). Then the small-strain dynamic properties of modified WMS were investigated by using resonance column test, and the microscopic mechanism of modified WMS was analyzed based on Scanning electron microscopy (SEM), Energy dispersive X-ray spectrometer (EDS), Transmission electron microscopy (TEM), X-ray diffraction test (XRD) and Mercury intrusion porosimetry (MIP). It can be found from the resonance column test that the dynamic shear modulus and the damping ratio show an increasing and decreasing trend with the increase of the confining pressure respectively, and both increase with increasing silica fume dosage in the range of 0 to 11 %. A kinetic model applicable to modified WMS was established by introducing the effects of confining pressure and silica fume into the Hardin-Drnevich model. Microscopic testing experiments indicate that there is a reaction between reactive SiO₂ in silica fume and Ca(OH)₂ in carbide slag, and calcium hydrated silicate (CSH) was generated, which improved the specimen density.

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小应变下硅灰和电石渣对废泥土的影响：动态特性和微观机理

利用硅灰和电石渣对废泥土进行改性，不仅可以改善废泥土的力学性能，还可以拓宽硅灰和电石渣的资源化利用途径。为此，本文采用8%的电石渣和不同掺量（0、3%、5%、7%、9%、11%）的硅粉对WMS进行了改性。然后采用共振柱试验研究了改性WMS的小应变动态性能，并利用扫描电镜（SEM）、能谱仪（EDS）、透射电镜（TEM）、x射线衍射仪（XRD）和压汞孔隙测定仪（MIP）分析了改性WMS的微观机理。从共振柱试验可以发现，动剪切模量和阻尼比分别随围压的增大而增大和减小，在0 ~ 11%范围内随硅灰掺量的增大而增大。将围压和硅灰的影响引入Hardin-Drnevich模型，建立了适用于改进WMS的动力学模型。显微测试实验表明，硅灰中的活性SiO2与电石渣中的Ca(OH)2发生反应，生成水合硅酸钙（CSH），提高了试样密度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Sustainable Materials and Technologies Energy-Renewable Energy, Sustainability and the Environment

CiteScore

13.40

自引率

4.20%

发文量

158

审稿时长

45 days

期刊介绍： Sustainable Materials and Technologies (SM&T), an international, cross-disciplinary, fully open access journal published by Elsevier, focuses on original full-length research articles and reviews. It covers applied or fundamental science of nano-, micro-, meso-, and macro-scale aspects of materials and technologies for sustainable development. SM&T gives special attention to contributions that bridge the knowledge gap between materials and system designs.