Optimisation of embodied carbon and compressive strength in low carbon concrete

Nukah, Promise D.; Abbey, Samuel J.; Booth, Colin A.; Nounu, Ghassan

Abstract

To improve the prediction of compressive strength and embodied carbon of low carbon concrete using a program algorithm developed in MATLAB, 84 datasets of concrete mix raw materials were used. The influence of water, silica fume and ground granular base slag was found to have a significant impact on the extent of low carbon concrete behaviour in terms of compressive strength and embodied carbon. While the concrete compressive strength for normal concrete increases with reducing water content, it is observed that the low carbon concrete using lightweight aggregate material increases in compressive strength with an increase in embodied carbon. From the result of the analysis, a function was developed that was able to predict the associated embodied carbon of a concrete mix for a given water-to-cement ratio. The use of an alkaline solution is observed to increase the compressive strength of low carbon concrete when used in combination with ground granular base slag and silica fume. It is further shown that ground granular base slag contributes significantly to an increase in the compressive strength of Low carbon concrete when compared with pulverised fly ash. The optimised mix design program resulted in a 26% reduction in embodied carbon and an R2 value of 0.9 between the measured compressive strength and the optimised compressive strength.

• Journal Article Type: Article
• Acceptance Date: Nov 24, 2022
• Online Publication Date: Dec 5, 2022
• Publication Date: Dec 5, 2022
• Deposit Date: Dec 6, 2022
• Publicly Available Date: Dec 6, 2022
• Journal: Materials
• Print ISSN: 1996-1944
• Electronic ISSN: 1996-1944
• Publisher: MDPI
• Peer Reviewed: Peer Reviewed
• Volume: 15
• Issue: 23
• Pages: 8673
• Series Title: This article belongs to the Special Issue 'Structural Behavior of Masonry and Concrete Members Strengthened with Fibre-Reinforced Composite Materials: Experimental Tests and Modelling'.
• DOI: https://doi.org/10.3390/ma15238673
• Keywords: General Materials Science; embodied carbon; optimisation; low carbon concrete; water‐to‐binder ratio compressive strength; simplex algorithm
• Public URL: https://uwe-repository.worktribe.com/output/10224288
• Publisher URL: https://www.mdpi.com/1996-1944/15/23/8673
• Related Public URLs: https://www.mdpi.com/journal/materials/special_issues/SF494UO599