Performance of mortar prepared with recycled concrete aggregate enhanced by CO2 and pozzolan slurry |
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| Affiliation: | 1. Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China;2. Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla 65401, MO, USA;3. Department of Civil Engineering, Fuzhou University, Fuzhou 350002, China;1. Department of Structural Engineering, College of Civil Engineering, Tongji University, Shanghai, China;2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China;1. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;3. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Shanghai 200240, China;4. School of Civil Engineering, University of Birmingham, Birmingham B15 2TT, UK;5. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China;6. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, Guangdong, China;1. School of Civil Engineering, Shaoxing University, Shaoxing 312000, China;2. College of Civil Science and Engineering, Yangzhou University. Yangzhou 225127, China;3. Department of Structural Engineering, Tongji University, Shanghai 200092, China |
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| Abstract: | One of the most promising strategies to manage the large volume of construction and demolition (C&D) waste is recycling and utilizing it for the production of new concrete. However, recycled concrete aggregate (RCA) derived from C&D waste possesses relatively higher porosity and water absorption capability, which often limits its wild utilization. In this study, pozzolan slurry (includes silica fume, nano-SiO2, and fly ash slurries) and CO2 treatments as enhancement methods for RCA were investigated. Test results showed that CO2 treatment was more effective in reducing water absorption and enhancing fluidity, whereas pozzolan slurry treatment could decrease fluidity. Mortars prepared with treated RCA exhibited better mechanical strength and higher resistance towards carbonation and chloride-ion diffusion than those with untreated RCA. Both pozzolan slurry and CO2 treatments enhanced not only the properties of RCA, but also the old and new interfacial transition zones (ITZs) as demonstrated in the measured micro-hardness and SEM observation. |
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| Keywords: | Recycled concrete aggregate Pozzolan slurry treatment Fluidity Mechanical properties Durability |
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