Mechanical Lasting Effectiveness of Carbon-Conditioning on Mixed Recycled Aggregate

Vivian W. Y. Tam (), Anthony Butera and Khoa N. Le
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Vivian W. Y. Tam: Western Sydney University
Anthony Butera: Western Sydney University
Khoa N. Le: Western Sydney University

A chapter in Proceedings of the 23rd International Symposium on Advancement of Construction Management and Real Estate, 2021, pp 1074-1080 from Springer

Abstract: Abstract The process of carbon-conditioning mixed recycled aggregate is known to strengthen the final mechanical properties of a recycled aggregate concrete. The accelerated injection of carbon dioxide (CO2) is able to provide a chemical reaction in which calcium hydroxide is converted into calcium carbonate. Consequently, the smaller calcium carbonate crystal densifies both the aggregate itself and interfacial transition zone of concrete. This paper reveals the time lasting effects of carbon-conditioning on mixed recycled aggregate exposed to CO2. Construction and demolition waste that does not contain calcium hydroxide experiences a weight gain when exposed to CO2, unfortunately, these materials such as bricks and tiles also forfeit this weight over time as the CO2 escapes their voids. Contrastingly, the recycled concrete used as aggregate is permanently densified as it does contain calcium hydroxide which can convert directly to calcium carbonate. The recycled aggregate that do not contain calcium hydroxide allow carbon dioxide to escape over a 216 h period, which if mixed into concrete promptly, can strengthen the final concretes interfacial transition zone and mechanical properties.

Keywords: Carbon-conditioning; Mixed recycled aggregate; Recycled aggregate concrete (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-981-15-3977-0_82

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DOI: 10.1007/978-981-15-3977-0_82

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