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Effect of slag on strength, durability and microstructural characteristics of fly ash-based geopolymer concrete

Effect of slag on strength, durability and microstructural characteristics of fly ash-based... Geopolymers are emerging construction materials with lower carbon dioxide emissions compared to the conventional cementitious materials. In this paper, an experimental investigation on the strength, durability and microstructural characteristics of GC blended with fly ash (FA), ground granulated blast furnace slag (GGBFS) and sodium-based alkaline solution. It was observed that the addition of 40% GGBFS in FA-based GC increases the 91-day compressive strength by 37% compared to control mix (cement-based concrete). The durability studies are revealed that the addition of FA with GGBFS has shown great impact in the decrement of pore structure. The microstructure investigation of the GC using SEM, and XRD showed the generation of steady and uniform geopolymeric reaction. The SEM images showed a closely packed and dense geopolymer matrix, which explains the reason behind the strength attainment of FA-GGBFS based GC samples. This was confirmed experimentally by the detection of the Ca-rich C-A-S-H gel in the interfacial transition zone. The experimental results showed that the inclusion of GGBFS with FA (Class F) helped achieve enhanced compressive strength to those of ordinary Portland cement. It was concluded that the fly ash and GGBFS combination did tend to form successful stable geopolymer concrete with high mechanical durability properties. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Building Pathology and Rehabilitation Springer Journals

Effect of slag on strength, durability and microstructural characteristics of fly ash-based geopolymer concrete

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References (44)

Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2022
ISSN
2365-3159
eISSN
2365-3167
DOI
10.1007/s41024-022-00163-4
Publisher site
See Article on Publisher Site

Abstract

Geopolymers are emerging construction materials with lower carbon dioxide emissions compared to the conventional cementitious materials. In this paper, an experimental investigation on the strength, durability and microstructural characteristics of GC blended with fly ash (FA), ground granulated blast furnace slag (GGBFS) and sodium-based alkaline solution. It was observed that the addition of 40% GGBFS in FA-based GC increases the 91-day compressive strength by 37% compared to control mix (cement-based concrete). The durability studies are revealed that the addition of FA with GGBFS has shown great impact in the decrement of pore structure. The microstructure investigation of the GC using SEM, and XRD showed the generation of steady and uniform geopolymeric reaction. The SEM images showed a closely packed and dense geopolymer matrix, which explains the reason behind the strength attainment of FA-GGBFS based GC samples. This was confirmed experimentally by the detection of the Ca-rich C-A-S-H gel in the interfacial transition zone. The experimental results showed that the inclusion of GGBFS with FA (Class F) helped achieve enhanced compressive strength to those of ordinary Portland cement. It was concluded that the fly ash and GGBFS combination did tend to form successful stable geopolymer concrete with high mechanical durability properties.

Journal

Journal of Building Pathology and Rehabilitation – Springer Journals

Published: Dec 1, 2022

Keywords: Geopolymer concrete; Geopolymeric reaction; Strength characteristics; Durability studies; Microstructure

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