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Development of low carbon concrete and prospective of geopolymer concrete using lightweight coarse aggregate and cement replacement materials

Nukah, Promise D.; Abbey, Samuel J.; Booth, Colin A.; Oti, Jonathan

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Authors

Promise D. Nukah

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Samuel Abbey Samuel.Abbey@uwe.ac.uk
Associate Director - Engineering Practice and Management/Associate Professor

Colin A. Booth

Jonathan Oti



Abstract

The use of Ground Granulated Blast-furnace Slag (GGBS) as an alternative cement replacement material in combination with conventional coarse aggregate have been successful in the production of near green concrete. Undoubtedly, GGBS has exhibited good cementitious attributes, however, there are concerns with slow strength development and workability owing to its non-pozzolanic activities as well as some degree of porosity notwithstanding the sustainability potential. Therefore, this study presents a lytag based geopolymer lightweight concrete with high strength development, improved mechanical properties and reduced embodied carbon. To further improve and enhance the potential production of green concrete, complete replacement of conventional coarse aggregate with a recycled lightweight aggregate from industrial waste was carried out. The geopolymer precursors consisted of sodium hydroxide, sodium silicate, GGBS and silica fume to optimize the performance of the concrete at 60–80% cement replacement for a target design mix of 20, 30, 40, and 50 MPa. The performance of lytag based geopolymer concrete was compared with that of non-geopolymer lytag based concrete (control samples). The results show a 42% increase in compressive strength for the geopolymer lightweight concrete and a 22% increase in ultimate compressive strain which is an indication of improved moment of resistance in structural design. The results also show a 46–61% reduction in embodied carbon for the use of non-geopolymer lytag based concrete and 69–77% reduction for lytag based geopolymer concrete. The geopolymer concrete between 7 and 63 days of loading increases by 0.55% in creep strain compared with increases of 2.81% for non-geopolymer lytag based concrete and reduction to 27.96% for the normal weight concrete. Modulus of Elasticity reduces with age of loading for the geopolymer concrete during creep at 0.39% compared to reduction of 1.93% for non-geopolymer lytag based concrete and increase of 12% for the normal weight concrete.

Journal Article Type Article
Acceptance Date Apr 15, 2024
Online Publication Date Apr 20, 2024
Publication Date May 17, 2024
Deposit Date Apr 22, 2024
Publicly Available Date Apr 23, 2024
Journal Construction and Building Materials
Print ISSN 0950-0618
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 428
Article Number 136295
DOI https://doi.org/10.1016/j.conbuildmat.2024.136295
Keywords General Materials Science; Building and Construction; Civil and Structural Engineering
Public URL https://uwe-repository.worktribe.com/output/11909940
Additional Information This article is maintained by: Elsevier; Article Title: Development of low carbon concrete and prospective of geopolymer concrete using lightweight coarse aggregate and cement replacement materials; Journal Title: Construction and Building Materials; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.conbuildmat.2024.136295; Content Type: article; Copyright: © 2024 The Author(s). Published by Elsevier Ltd.

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