Assessment of mechanical properties of concrete incorporating carbonated recycled concrete aggregates |
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| Affiliation: | 1. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;2. Key Laboratory of Building Safety and Energy Efficiency (Ministry of Education), College of Civil Engineering, Hunan University, Changsha, China;1. School of Materials Science and Engineering, Southeast University, Nanjing 211189, PR China;2. Jiangsu Key Lab of Construction Material, Southeast University, Nanjing 211189, PR China;3. Jiangsu Zhenjiang Research Institute of Building Science Group Co., Ltd, Zhenjiang 212004, PR China;1. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;2. Key Laboratory of Building Safety and Energy Efficiency, College of Civil Engineering, Hunan University, Changsha, China;1. Institute of Water Resources and Hydro-electric Engineering, Xi’an University of Technology, Xi’an, Shaanxi 710048, China;2. China Institute of Water Resources and Hydropower Research, Beijing 100044, China |
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| Abstract: | An accelerated carbonation technique was employed to strengthen the quality of recycled concrete aggregates (RCAs) in this study. The properties of the carbonated RCAs and their influence on the mechanical properties of new concrete were then evaluated. Two types of RCAs, an old type of RCAs sourced from demolished old buildings and a new type of RCAs derived from a designed concrete mixture, were used. The chosen RCAs were firstly carbonated for 24 h in a carbonation chamber with a 100% CO2 concentration at a pressure level of 0.1 Bar and 5.0 Bar, respectively. The experimental results showed that the properties of RCAs were improved after the carbonation treatment. This resulted in performance enhancement of the new concrete prepared with the carbonated RCAs, especially an obvious increase of the mechanical strengths for the concrete prepared with the 100% carbonated new RCAs. Moreover, the replacement percentage of natural aggregates by the carbonated RCAs can be increased to 60% with an insignificant reduction in the mechanical properties of the new concrete. |
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| Keywords: | Recycled concrete aggregates Recycled aggregate concrete Carbonation Mechanical properties |
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