Experimental study of the feasibility of using anhydrous sodium metasilicate as a geopolymer activator for soil stabilization

Yu, Jiaren; Chen, Yonghui; Chen, Geng; Wang, Lei

doi:10.1016/j.enggeo.2019.105316

Cited by 73 publications

(15 citation statements)

References 27 publications

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“…Yu et al [44] describe FT-IR spectroscopy as a method that provides a bulk analysis of the molecular adsorption bands of the raw materials and the changes that have occurred during product formation. Pasupathy et al [45] determined the FT-IR bands observed in fly-ash-based geopolymer (GPC) and ordinary Portland cement (OPC) concretes.…”

Section: Fourier Transform Infrared Radiation (Ft-ir) Spectroscopymentioning

confidence: 99%

Geopolymers as Sustainable Material for Strengthening and Restoring Unreinforced Masonry Structures: A Review

et al. 2021

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Unreinforced masonry (URM) structures are vulnerable to earthquakes; thus, materials and techniques for their strengthening and restoration should be developed. However, the materials used in some of the existing retrofitting technologies for URM and the waste produced at its end-of-life are unsustainable. The production of ordinary Portland cement (OPC) worldwide has enormously contributed to the global carbon footprint, resulting in persistent environmental problems. Replacing OPC with geopolymers, which are more sustainable and environmentally friendly, presents a potential solution to these problems. Geopolymers can replace the OPC component in engineering cementitious composites (ECC), recommended to strengthen and restore URM structures. In the present paper, the state-of-the-art knowledge development on applying geopolymers in URM structures is discussed. The discussion is focused on geopolymers and their components, material characterization, geopolymers as a strengthening and restoration material, and fiber-reinforced geopolymers and their application to URM structures. Based on this review, it was found that the mechanical properties of geopolymers are on par with that of OPC; however, there are few studies on the mentioned applications of geopolymers. The characterization of geopolymers’ mechanical and physical properties as a restoration material for URM structures is still limited. Therefore, other properties such as chemical interaction with the substrate, workability, thixotropic behavior, and aesthetic features of geopolymers need to be investigated for its wide application. The application method of geopolymer-based ECC as a strengthening material for a URM structure is by grouting injection. It is also worth recommending that other application techniques such as deep repointing, jacketing, and cement-plastering be explored.

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Section: Fourier Transform Infrared Radiation (Ft-ir) Spectroscopymentioning

confidence: 99%

Geopolymers as Sustainable Material for Strengthening and Restoring Unreinforced Masonry Structures: A Review

et al. 2021

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“…The one-part AAB does not need storage, management, and use of highly corrosive alkali-solutions in the worksite, which are very dangerous to the workers involved. This favors the commercialization and application of AAB in civil construction activities 1,12,13 .…”

Section: Introductionmentioning

confidence: 99%

“…One-part AAB made with anhydrous sodium metasilicate as activator presented high compressive strength; however, the production of this chemical product has environmental impacts 12,14,15 . The extra energy necessary to produce the solid activators makes one-part AAB more environmentally impacting than a two-part binder 16 .…”

Section: Introductionmentioning

confidence: 99%

Production Process of an Eco-Friendly One-Part Alkali-Activated Binder

2022

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One-part alkali-activated binder (AAB) is a product with lower environmental impact than Portland cement, and can be a feasible commercial alternative. The main objective of this study was to propose and test a method of obtaining one-part AAB with metakaolin and an alternative powder sodium silicate from rice husk ash (RHA). To evaluate the AAB properties, mortars were produced with different SiO 2 /Al 2 O 3 molar ratios (2.7, 3.1, and 3.3), and tests were conducted to characterize the binder. The results indicated that the process was efficient in generating a non-crystalline sodium silicate powdered material. With high SiO 2 /Al 2 O 3 molar ratio the mortars achieved high compressive strength and it increased with age, had low permeability, and capillary water absorption. Compressive strength results varied from 6 MPa to 12 MPa at 28 days, indicating the possibility of using the proposed method for one-part AAB production. AAB produced can be applied in different building materials.

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“…Recent research has reported the effectiveness of the alkali-activated binders in soil stabilisation, with benefits on swell suppression and enhancement of strength and stiffness both at laboratory and field scale (Consoli et al, 2020;Cristelo et al, 2015;Miranda et al, 2020;Obuzor et al, 2012;Yu et al, 2020). Corrêa-Silva et al, 2019 undertook triaxial testing on a lean clayey sand stabilised with a blend of low Ca PFA and NaOH-Na 2 SiO 3 after 28 days whereby increases in the effective cohesion (200% in total peak strength) and critical state friction angle (50% and 73% in effective and total stresses, respectively) were observed.…”

Section: Introductionmentioning

confidence: 99%

Predicting the mechanical behaviour of a sandy clay stabilised with an alkali-activated binder

Corrêa-Silva

Rouainia

Miranda

et al. 2021

Engineering Geology

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Experimental study of the feasibility of using anhydrous sodium metasilicate as a geopolymer activator for soil stabilization

Cited by 73 publications

References 27 publications

Geopolymers as Sustainable Material for Strengthening and Restoring Unreinforced Masonry Structures: A Review

Geopolymers as Sustainable Material for Strengthening and Restoring Unreinforced Masonry Structures: A Review

Production Process of an Eco-Friendly One-Part Alkali-Activated Binder

Predicting the mechanical behaviour of a sandy clay stabilised with an alkali-activated binder

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