Performance of Alkali-Activated Slag Concrete Masonry Blocks Subjected to Accelerated Carbonation Curing

• Published in: Sustainability 2023-10, Vol.15 (19), p.14291
• Main Authors: Hwalla, Joud, Al-Mazrouei, Mahra, Al-Karbi, Khalood, Al-Hebsi, Afraa, Al-Ameri, Mariam, Al-Hadrami, Fatima, El-Hassan, Hilal
• Format: Article
• Language: English
• Subjects: Carbon dioxide; Cement; Concrete; Construction industry; Curing; Emissions; Environmental impact; Industrial wastes; Masonry; Mechanical properties; Natural resources; Raw materials; Sustainability
• ISSN: 2071-1050; 2071-1050
• DOI: 10.3390/su151914291

This study investigates the effect of accelerated carbonation curing on the carbon sequestration potential, performance, and microstructure of alkali-activated slag mixes representing concrete masonry blocks (CMBs). The carbonation curing process parameters varied, including initial curing duration, carbonation curing duration, and carbonation pressure. Research findings showed that a maximum CO2 uptake of 12.8%, by binder mass, was attained upon exposing concrete to 4 h initial curing and 20 h carbonation curing at a pressure of 5 bars. The compressive strength and water absorption capacity improved with longer initial and carbonation curing durations and higher pressure. Upon subjecting to salt attack, the mass and strength of 28-day concrete samples increased, owing to the formation of Friedel’s salt and Halite. All mixes could be used as non-load-bearing CMB, with a 1-day strength greater than 4.1 MPa. Based on the global warming potential index, the carbon footprint of carbonation-cured, alkali-activated slag concrete masonry units was up to 46% lower than non-carbonation-cured counterparts. Research findings offer valuable information on the production of carbonation-cured, cement-free concrete masonry blocks to replenish natural resources, recycle industrial waste, and mitigate CO2 emissions.