A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Compressive Strength, Water Absorption and Efflorescence Characteristics of One-Part Geopolymer Concrete Masonry Units
The development and testing of low-carbon alternative masonry units (AMUs) in mitigating the carbon footprint of traditional burnt clay and cement-based masonry units is germane to achieving sustainability. This study explores one-part geopolymer material technology used in the development of eco-friendly AMUs. Fly ash-blast furnace slag and fly ash-metakaolin-based one-part geopolymer concrete masonry units, activated by solid sodium hydroxide, powdered calcium hydroxide and solid sodium metasilicate pentahydrate geopolymer mixes were developed and tested for strength and durability. The compressive strength and water absorption of the AMUs were characterised at 7- and 28-day under ambient curing conditions. Additionally, the extent of efflorescence was monitored and reported. The results show suitable 28-day compressive strengths of 18.4 MPa and 6.1 MPa for fly ash-blast furnace slag and fly ash-metkaolin-based units, respectively, surpassing 4 MPa and meeting the prescribed minimum requirements for single-story masonry structures. The water absorption characteristics in both cold and boiled conditions remained below the 10% limit for concrete masonry units and the initial rate of absorption (IRA) was acceptable. Additionally, the extent of efflorescence was minimal to non-existent.
Compressive Strength, Water Absorption and Efflorescence Characteristics of One-Part Geopolymer Concrete Masonry Units
The development and testing of low-carbon alternative masonry units (AMUs) in mitigating the carbon footprint of traditional burnt clay and cement-based masonry units is germane to achieving sustainability. This study explores one-part geopolymer material technology used in the development of eco-friendly AMUs. Fly ash-blast furnace slag and fly ash-metakaolin-based one-part geopolymer concrete masonry units, activated by solid sodium hydroxide, powdered calcium hydroxide and solid sodium metasilicate pentahydrate geopolymer mixes were developed and tested for strength and durability. The compressive strength and water absorption of the AMUs were characterised at 7- and 28-day under ambient curing conditions. Additionally, the extent of efflorescence was monitored and reported. The results show suitable 28-day compressive strengths of 18.4 MPa and 6.1 MPa for fly ash-blast furnace slag and fly ash-metkaolin-based units, respectively, surpassing 4 MPa and meeting the prescribed minimum requirements for single-story masonry structures. The water absorption characteristics in both cold and boiled conditions remained below the 10% limit for concrete masonry units and the initial rate of absorption (IRA) was acceptable. Additionally, the extent of efflorescence was minimal to non-existent.
Compressive Strength, Water Absorption and Efflorescence Characteristics of One-Part Geopolymer Concrete Masonry Units
RILEM Bookseries
Beushausen, Hans (editor) / Ndawula, Joanitta (editor) / Alexander, Mark (editor) / Dehn, Frank (editor) / Moyo, Pilate (editor) / Bhayat, Moegamat Tashriq (author) / Babafemi, Adewumi John (author) / De Villiers, Wibke (author)
International Conference on Concrete Repair, Rehabilitation and Retrofitting ; 2024 ; Cape Town, South Africa
2024-11-01
10 pages
Article/Chapter (Book)
Electronic Resource
English
Evaluation of early-age compressive strength of geopolymer concrete masonry units
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