Quality Enhancement of Recycled Concrete Aggregates for Backfill Materials by CO2 Carbonation: Development of a 5-kg-scale Prototype Reactor

Jinwoo Kim; Min-Kyung Jeon; Tae-Hyuk Kwon; Nam-Ryong Kim

doi:10.7843/kgs.2024.40.1.29

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Quality Enhancement of Recycled Concrete Aggregates for Backfill Materials by CO₂ Carbonation: Development of a 5-kg-scale Prototype Reactor 이산화탄소의 탄산화 반응을 이용한 되메움재용 순환골재의 품질 개량: 5kg급 프로토타입 반응조 개발

29 February 2024. pp. 29-37

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Abstract

In this study, recycled concrete aggregates (RCA) were treated in a 5-kg-scale prototype reactor with carbon dioxide (CO₂) to enhance their material quality and geotechnical performance. The aggregate crushing value (ACV) and California bearing ratio (CBR) were measured on untreated RCAs and CO₂-treated RCAs. After CO₂ treatment, the ACV decreased from 35.6% to 33.2%, and the CBR increased from 97.5% to 102.4%. The CO₂ treatment caused a reduction of fine particle generation and an increase in bearing capacity through carbonation. When CO₂ treatment was performed with mechanical agitation, which provided additional enhancement in mechanical quality, the ACV was reduced further to 30.3%, and the CBR increased to 137.7%. If upscaled effectively, the proposed CO₂ treatment technique would be an effective method to reduce carbon emissions in construction industries.

Keywords

Aggregate crushing value (ACV)

California bearing ratio (CBR)

CO₂ treatment

Prototype reactor

Recycled concrete aggregate (RCA)

본 연구에서는 이산화탄소 처리를 통한 순환골재의 지반공학적 성능 개량을 평가하기 위하여 5kg급 프로토타입 반응조를 제작하였다. 제작된 반응조를 이용하여 이산화탄소 처리한 순환골재와 미처리 순환골재의 골재 파쇄값과 노상토지지력비를 측정하였다. 이산화탄소 처리를 통해 골재 파쇄값은 35.6%에서 33.2%로 2.4% 감소하고 노상토지지력비는 97.5%에서 102.4%로 4.9% 증가하는 것이 관찰되었다. 탄산화 반응을 통해 생성된 탄산칼슘 염으로 인해 순환골재의 세립분 생성이 감소하고 지지력이 증가함을 알 수 있었다. 또한 교반을 함께할 경우 추가적인 역학적 개량 효과를 통해 골재 파쇄값이 30.3%로 감소하고 노상토지지력비는 137.7%로 증가하였다. 본 연구에서 기술된 이산화탄소 처리 기술의 현장 적용 시 건설 산업의 탄소배출을 효과적으로 줄일 수 있을 것으로 보인다.

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Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 40
No :1
Pages :29-37
Received Date : 2024-01-09
Revised Date : 2024-02-06
Accepted Date : 2024-02-06
DOI :https://doi.org/10.7843/kgs.2024.40.1.29

Journal of the Korean Geotechnical Society ISSN:1229-2427(Print) 2288-646X(Online) 한국지반공학회 논문집

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