Effect of borax in slag-fly ash-based alkali activated paste

Alkali Activated Concrete (AAC) uses source materials rich in aluminosilicates to gain the properties superior to OPC based concrete. Alkaline chemicals are used to activate reaction in aluminosilicate precursors. In this study a combination of Ground Granulated Blast Furnace Slag (BFS) and fly ash...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2023-09, Vol.1237 (1), p.12006
Main Authors: Thomas, Shobha Elizabeth, Muhsin Lebba, A, Sreeja, S, Ramaswamy, K.P
Format: Article
Language:English
Subjects:
Alkali activated materials
Aluminosilicates
Aluminum silicates
Borax
Concrete
control factors
Emissions
flash setting
Fly ash
geopolymer
GGBS
Granulation
Greenhouse effect
Greenhouse gases
Industrial wastes
Penetration resistance
Precursors
Slag
Sodium hydroxide
Sodium silicates
Waste materials
Workability
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Summary:Alkali Activated Concrete (AAC) uses source materials rich in aluminosilicates to gain the properties superior to OPC based concrete. Alkaline chemicals are used to activate reaction in aluminosilicate precursors. In this study a combination of Ground Granulated Blast Furnace Slag (BFS) and fly ash with low calcium content (class F) is used as precursor and the activator used to activate the precursor is a combination of NaOH pellets and sodium silicate solution. Research interest in alkali activated materials (AAM) has grown as a result of its unique characteristics, which include less greenhouse gas emissions during its production, effective utilization of industrial waste materials, and sustainable as well as economic attributes. However, its quick setting as well as poor workability are deterring its widespread popularity. Though borax has been identified as a good retarder for cement-based materials, its effect on the blast furnace slag-fly ash-based alkali activated system with respect to the control factors were less investigated. The setting time, penetration resistance and workability of Alkali Activated Paste (AAP) is studied to identify the effect of borax with respect to the control factors. The potential of borax in AAM to improve its workability qualities were studied. According to the experimental results obtained, borax is a good retarder for slag-fly ash-based AAP and it could improve workability.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/1237/1/012006