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http://dx.doi.org/10.14190/JRCR.2021.9.1.33

The Effect of Supercritical Carbonation on Quality Improvement of Recycled Fine Aggregate  

Heo, Seong-Uk (Department of Architectural Engineering, Pukyong National University)
Kim, Ji-Hyun (Multidisciplinary Infra-technology Research Laboratory, Pukyong National University)
Chung, Chul-Woo (Division of Architectural and Fire Protection Engineering, Pukyong National University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.9, no.1, 2021 , pp. 33-40 More about this Journal
Abstract
The objective of this work is to prove a possibility of void f illing through a carbonation f or the purpose of improving the quality of recycled aggregate. Carbonation can permanently immobilize CO2, which is a greenhouse gas, and thus provides additional benefit on environment. In this work, recycled fine aggregate was reacted using gaseous CO2 and supercritical CO2(scCO2) in a closed chamber, and the changes in physical properties of the recycled f ine aggregate bef ore and af ter carbonation were analyzed using the apparent density, skeletal density, pH, and FE-SEM measurements. Thereafter, a mortar specimen was prepared and a compressive strength was measured. According to the experimental results, it was found that the increase in the apparent density and the true density was higher by the reaction with scCO2, which was conducted at high temperature and high pressure compared to the reaction with gaseous CO2. In addition, the pH of the eluted water was found to have a larger initial decrease than that observed with samples from reaction by gaseous CO2. The shape and amount of calcium carbonate crystals were also found to be larger than that from gaseous CO2. The increase in compressive strength was the largest when using recycled fine aggregate reacted with scCO2. It was clear that quality improvement of recycled fine aggregate was higher with scCO2 than with gaseous CO2.
Keywords
Carbonation; Recycled fine aggregate; Gaseous; Supercritical; Carbon dioxide;
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Times Cited By KSCI : 1  (Citation Analysis)
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