The Influence of Fly Ash Carbonation on the Protective Properties of Concrete Cover Towards Reinforcement
Beata Jaworska, Dominika Stańczak, Rafał Kobyłka, Tomasz Gołofit, Duo Zhang, Justyna Kuziak
TL;DR
This study explores how carbonating fly ash affects concrete's ability to protect steel reinforcement, finding that it can significantly extend the material's service life.
Contribution
The study introduces a novel approach to using carbonated fly ash in concrete to enhance long-term durability and reduce CO2 emissions.
Findings
Concrete with carbonated fly ash showed a compressive strength reduction of up to 9% after 90 days.
Carbonated ash reduced the carbonation rate of concrete by about 4% compared to non-carbonated ash.
Concrete containing carbonated ash had an estimated service life over 20 times longer than reference concrete.
Abstract
To address the challenge of reducing carbon dioxide emissions, this study focuses on carbon dioxide sequestration in calcareous fly ash and its use in mortar and concrete specimens, including reinforced structures. Calcareous fly ash was used in this study because it contains more reactive Ca phases, enabling efficient CO2 capture and long-term storage through mineral carbonation. The research examines the influence of incorporating carbonated fly ash on the protective properties of the concrete cover for steel reinforcement, along with an analysis of the mechanical behavior of the specimens, resistance to weathering carbonation, and the modeling of the service life of reinforced concrete structures. The results indicate that the compressive strength of concrete specimens decreases with the addition of carbonated ash, though by no more than 9% after 90 days. The carbonation rate of…
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Taxonomy
TopicsConcrete and Cement Materials Research · Concrete Corrosion and Durability · CO2 Sequestration and Geologic Interactions