Shear strength behavior of organic soils treated with fly ash and fly ash-based geopolymer

IF 1.7 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of the Mechanical Behavior of Materials Pub Date : 2023-01-01 DOI:10.1515/jmbm-2022-0264

Sarah K. Ameen, A. Abdulkareem, N. Mahmood

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Abstract

Abstract Organic soil is a problematic soil that needs to be treated before construction because of the low shear strength and high compressibility. Using by-product materials, such as fly ash (FA), to improve soils is a cost-effective and sustainable procedure. Because treatment with FA may lead to reduce shear strength, a FA-based geopolymer was used with a cohesive organic soil to substitute the reduction in strength. A series of unconfined compressive strength tests (UCS) were conducted on compacted specimens treated with FA and geopolymer. The geopolymer was produced by adding sodium hydroxide to activate the FA. Different levels of FA content, curing period, and temperature were applied to the specimens. The results indicate that for the FA treated specimens, the UCS decreased as the FA increased. For the geopolymer-treated specimens, as FA percentage in the geopolymer increased, the UCS increased and the axial strain at failure decreased. The optimum content of FA, in the geopolymer, was 20%, and the highest UCS was achieved at a curing period of 28 days at a temperature level of 65°C. Based on the obtained results, FA-based geopolymer can effectively be used to improve the strength of organic soils.

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粉煤灰及粉煤灰基地聚合物处理有机土的抗剪强度特性

摘要有机土是一种有问题的土壤，由于其抗剪强度低、压缩性强，需要在施工前进行处理。使用副产品材料，如粉煤灰（FA）来改善土壤是一种成本效益高且可持续的程序。由于FA处理可能会降低抗剪强度，因此将FA基地质聚合物与粘性有机土一起使用，以代替强度的降低。对经FA和地质聚合物处理的压实试样进行了一系列无侧限抗压强度试验。通过添加氢氧化钠活化FA制备地质聚合物。对样品施加不同水平的FA含量、固化时间和温度。结果表明，对于FA处理的试样，UCS随着FA的增加而降低。对于地质聚合物处理的试样，随着地质聚合物中FA百分比的增加，UCS增加，破坏时的轴向应变降低。地质聚合物中FA的最佳含量为20%，在65°C的温度水平下，养护28天时达到最高UCS。根据研究结果，FA基地质聚合物可以有效地提高有机土的强度。

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

Journal of the Mechanical Behavior of Materials Materials Science-Materials Science (miscellaneous)

CiteScore

3.00

自引率

11.10%

发文量

审稿时长

30 weeks

期刊介绍： The journal focuses on the micromechanics and nanomechanics of materials, the relationship between structure and mechanical properties, material instabilities and fracture, as well as size effects and length/time scale transitions. Articles on cutting edge theory, simulations and experiments – used as tools for revealing novel material properties and designing new devices for structural, thermo-chemo-mechanical, and opto-electro-mechanical applications – are encouraged. Synthesis/processing and related traditional mechanics/materials science themes are not within the scope of JMBM. The Editorial Board also organizes topical issues on emerging areas by invitation. Topics Metals and Alloys Ceramics and Glasses Soils and Geomaterials Concrete and Cementitious Materials Polymers and Composites Wood and Paper Elastomers and Biomaterials Liquid Crystals and Suspensions Electromagnetic and Optoelectronic Materials High-energy Density Storage Materials Monument Restoration and Cultural Heritage Preservation Materials Nanomaterials Complex and Emerging Materials.