An enhanced approach to red mud (RM) sustainable management and utilization for marl stabilization considering the dynamic response and durability analysis

IF 6.5 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Amir Hossein Vakili , Mahdi Salimi , İnan Keskin , Mehmet İnanç Onur , Abdollah Tabaroei , Mohammadhossein Dadgar
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Abstract

Marl soil, known for its high calcite content, presents significant challenges in construction projects due to its low strength and poor durability, especially under varying moisture conditions. In wet environments, marl often exhibits rapid disintegration, compromising stability and limiting its use in geotechnical applications. On the other hand, the worldwide disposal of red mud (RM) waste, an industrial by-product of alumina processing, has resulted in significant environmental concerns and substantial financial burdens. This study investigates the potential of RM for enhancing the mechanical, dynamic, and durability characteristics of marl soil under both dry and wet conditions. The experiments included the unconfined compressive strength test (UCS), Brazilian tensile strength test (BTS), bender element test (BET), long-time soaking test, as well as a set of microstructural analyses. The findings indicated that the UCS of the samples containing 30 % RM increased by 3.6 and 6.83 times after curing periods of 7 and 28, respectively, reaching an acceptable strength level even under wet conditions. Furthermore, RM was found capable of postponing the development of cracks and sustaining the integrity of the sample over the long term. RM treatment also improved the dynamic properties, increasing shear wave velocity by 127.9 % and reclassifying the soil from Class F (very weak) to Class D (very stiff) under seismic loading criteria. However, RM introduced brittle behavior to the treated samples, resulting in reduced axial strain and a 60–70 % drop in strength under wet conditions. Future research should focus on addressing these limitations by incorporating additional stabilizing agents. This study highlights the potential of RM for sustainable soil stabilization, offering an effective approach to managing industrial waste while enhancing marl’s performance in geotechnical applications.
考虑动力响应和耐久性分析的赤泥稳定可持续管理和利用方法的改进
灰土以其方解石含量高而闻名,由于其强度低,耐久性差,特别是在不同的湿度条件下,在建筑项目中提出了重大挑战。在潮湿的环境中,泥灰岩往往表现出快速的崩解,从而影响其稳定性,限制了其在岩土工程中的应用。另一方面,世界范围内处理红泥废物(一种氧化铝加工的工业副产品)造成了严重的环境问题和沉重的财政负担。本研究探讨了RM在干燥和潮湿条件下增强泥质土的力学、动力和耐久性特性的潜力。试验包括无侧限抗压强度试验(UCS)、巴西抗拉强度试验(BTS)、弯曲单元试验(BET)、长时间浸泡试验以及一组显微组织分析。结果表明,含有30 % RM的试样在养护7和28个周期后,单抗强度分别提高了3.6倍和6.83倍,即使在潮湿条件下也达到了可接受的强度水平。此外,RM被发现能够延缓裂纹的发展,并长期保持样品的完整性。RM处理还改善了动力特性,使剪切波速提高了127.9% %,并将地震荷载标准下的土壤从F级(非常弱)重新分类为D级(非常硬)。然而,RM给处理过的样品引入了脆性行为,导致轴向应变降低,湿条件下强度下降60 - 70% %。未来的研究应该集中于通过加入额外的稳定剂来解决这些限制。这项研究强调了RM在可持续土壤稳定方面的潜力,为管理工业废物提供了一种有效的方法,同时提高了泥灰岩在岩土工程应用中的性能。
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来源期刊
CiteScore
7.60
自引率
19.40%
发文量
842
审稿时长
63 days
期刊介绍: Case Studies in Construction Materials provides a forum for the rapid publication of short, structured Case Studies on construction materials. In addition, the journal also publishes related Short Communications, Full length research article and Comprehensive review papers (by invitation). The journal will provide an essential compendium of case studies for practicing engineers, designers, researchers and other practitioners who are interested in all aspects construction materials. The journal will publish new and novel case studies, but will also provide a forum for the publication of high quality descriptions of classic construction material problems and solutions.
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