Carbon-conditioning or chemical permeation methods can provide excellent microstructural improvement to recycled concrete and brick aggregate, however, the applications have its limitations. Further, recycled brick aggregate cannot be effectively carbon-conditioned with conventional methods as it contains only trace amounts of reactive materials. It is thereby a necessity to use hybrid methods involving dual technologies combining carbon-conditioning and chemical permeation for its improvements. This paper is focused in developing a novel hybrid method for improving the microstructural properties of recycled concrete aggregate and recycled brick aggregate for concrete usage. This study conducts particle density, water absorption and crushing value tests in measuring the physical improvements achieved with the novel hybrid method; and utilizes variety of chemicals and a reaction chamber for carbon conditioning for aggregate treatment. The study evinces that both the recycled concrete aggregate and recycled brick aggregate experienced significant improvements with 10-mm and 20-mm recycled concrete aggregate and 10 mm recycled brick aggregate exceeding the density of virgin aggregate. Mg(OH)2 (s) + CO2 (g) treatment for recycled concrete aggregate and Ca(OH)2 (s) + Mg(OH)2 (s) + 2CO2 (g) treatment for recycled brick aggregate can be considered as potential candidates for optimal hybrid treatment methods.
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