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Published in: Geotechnical and Geological Engineering 7/2022

20-04-2022 | Original Paper

Macro–Micro Characterization of Green Stabilized Alkali-Activated Sand

Authors: Luciana Carvalho Queiróz, Gustavo Dias Miguel, Giovani Jordi Bruschi, Max Deluan Sampaio de Lima

Published in: Geotechnical and Geological Engineering | Issue 7/2022

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Abstract

Despite the natural bearing capacity of soils, it is common to encounter materials that are not suitable for earthworks purposes. Several techniques emerged as solutions to this problem, such as soil densification, soil stabilization, and soil reinforcement. In the case of soil stabilization, ordinary Portland cement remains as the main adopted binder even though its poor environmental performance. To achieve a more sustainable alternative, the present research investigated the role of influential factors on the strength development in alkali-activated sand, ground glass fiber (GGF) and carbide lime (CL) blends, as well as the physical, chemical, morphological and thermal characterization of these materials and their reaction products. The strength behavior was analyzed through unconfined compression and pulse velocity tests. The results showed strength and stiffness increases up to 5.00 MPa and 5.11 GPa for strength and stiffness, respectively. The adjusted porosity/volumetric binder content index (η/Biv0.28) demonstrated to be an effective tool to express the mechanical performance of the proposed blends. The blends with molar ratios of CaO/SiO2 = 1 presented the highest strength and stiffness increases. Finally, hydration products were detected and identified as rosenhahnite (Ca3(Si3O8(OH)2)) and soulunite (Ca2(Si2O5(OH)2)H2O) structures. Thereby, evidencing the application of ground glass fiber and carbide lime as green alternative binders to soil stabilization.

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Metadata
Title
Macro–Micro Characterization of Green Stabilized Alkali-Activated Sand
Authors
Luciana Carvalho Queiróz
Gustavo Dias Miguel
Giovani Jordi Bruschi
Max Deluan Sampaio de Lima
Publication date
20-04-2022
Publisher
Springer International Publishing
Published in
Geotechnical and Geological Engineering / Issue 7/2022
Print ISSN: 0960-3182
Electronic ISSN: 1573-1529
DOI
https://doi.org/10.1007/s10706-022-02130-9

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