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Development of eco-friendly GGBS and SF based alkali-activated mortar with quartz sand

Development of eco-friendly GGBS and SF based alkali-activated mortar with quartz sand To reduce the carbon footprint on the earth, it is a necessity to develop a 100% cement-free mix using pozzolanic binders from industrial wastes. The purpose of the present investigation is to develop 100% cement-free Alkali Activated Slag Mortar (AASM) with binders Ground Granulated Blast Furnace Slag (GGBS) and Silica Fume (SF), with an alkali solution of different combinations of Sodium Silicate (Na2SiO3) and Sodium Hydroxide (NaOH). AASM is developed with different combinations of Binder to the fine aggregate ratio of 1:2, 1:5, and 1:8 with alkaline to binder ratios of 0.5, 0.65, and 0.8. The alkali solutions are established for 9 M, 13 M, 16 M, and 19 M of NaOH and 20%, 35%, and 50% concentrations of Na2SiO3. The study is also conducted with different fine-aggregates like river sand, robo sand, quartz sand, and sea sand to establish the suitability of each of them as fine aggregates. The results on different fine aggregates indicate that the quartz sand mixes showed better performance. The results of AASM with different mix combinations reveal 1:2 mix proportion and 0.8 alkali binder ratio mixes exhibiting good performance compared to other mix combinations. 19 M of NaOH and 50% of Na2SiO3 produce the highest compressive and flexural strength of mortar among the different concentrations of alkali activators solution. SEM and EDX analysis of AASM discloses the formation of strong bond compounds like Calcium-Alumino-Silicate Hydrate (CASH) and Sodium-Alumino-Silicate Hydrate (NASH) are formed resulting in a dense microstructure of AASM, consequently high compressive and flexural strengths are achieved. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Building Pathology and Rehabilitation Springer Journals

Development of eco-friendly GGBS and SF based alkali-activated mortar with quartz sand

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References (73)

Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2022. Springer Nature or its licensor holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
ISSN
2365-3159
eISSN
2365-3167
DOI
10.1007/s41024-022-00235-5
Publisher site
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Abstract

To reduce the carbon footprint on the earth, it is a necessity to develop a 100% cement-free mix using pozzolanic binders from industrial wastes. The purpose of the present investigation is to develop 100% cement-free Alkali Activated Slag Mortar (AASM) with binders Ground Granulated Blast Furnace Slag (GGBS) and Silica Fume (SF), with an alkali solution of different combinations of Sodium Silicate (Na2SiO3) and Sodium Hydroxide (NaOH). AASM is developed with different combinations of Binder to the fine aggregate ratio of 1:2, 1:5, and 1:8 with alkaline to binder ratios of 0.5, 0.65, and 0.8. The alkali solutions are established for 9 M, 13 M, 16 M, and 19 M of NaOH and 20%, 35%, and 50% concentrations of Na2SiO3. The study is also conducted with different fine-aggregates like river sand, robo sand, quartz sand, and sea sand to establish the suitability of each of them as fine aggregates. The results on different fine aggregates indicate that the quartz sand mixes showed better performance. The results of AASM with different mix combinations reveal 1:2 mix proportion and 0.8 alkali binder ratio mixes exhibiting good performance compared to other mix combinations. 19 M of NaOH and 50% of Na2SiO3 produce the highest compressive and flexural strength of mortar among the different concentrations of alkali activators solution. SEM and EDX analysis of AASM discloses the formation of strong bond compounds like Calcium-Alumino-Silicate Hydrate (CASH) and Sodium-Alumino-Silicate Hydrate (NASH) are formed resulting in a dense microstructure of AASM, consequently high compressive and flexural strengths are achieved.

Journal

Journal of Building Pathology and Rehabilitation – Springer Journals

Published: Dec 1, 2022

Keywords: Alkali activator; Ground granulated blast furnace slag; Ambient curing; Quartz sand; Micro-structural analysis

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