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Effect of carbonation of modeled recycled coarse aggregate on the mechanical properties of modeled recycled aggregate concrete
Affiliation:1. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China;2. Department of Structural Engineering, College of Civil Engineering, Tongji University, Shanghai, China;1. School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China;2. Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China;3. Jiangsu Key Lab of Construction Materials, Nanjing, 211189, China;4. Jiangsu Collaborative Innovation Centre, Nanjing, 211189, China;1. College of Civil Engineering, Hunan University, Changsha 410082, China;2. WOWA International Engineering & Consulting Co. Ltd, Shenzhen, Guangzhou, China;3. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China;4. College of Civil Engineering and Mechanics, Central South University of Forestry and Technology, Changsha 410018, China;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. 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;1. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;2. Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, PR China
Abstract:The modeled recycled aggregate concrete (MRAC) which is an idealized model for the real recycled aggregate concrete (RAC) was used in this study. The MRCAs prepared with two types of old mortars were modified by an accelerated carbonation process. The effects of carbonation of MRCA on the micro-hardness of MRCA and the mechanical properties of MRAC were investigated. The results indicated that the micro-hardness of the old interfacial transition zone (ITZ) and the old mortar in the carbonated MRCAs was higher than that in the uncarbonated MRCAs, and the enhancement of the old ITZ was more significant than that of the old mortar. The compressive strength and modulus of MRACs increased when the carbonated MRCAs were utilized, and the improvement was more significant for MRAC prepared with a higher w/c. In addition, a numerical study was carried out and it showed that the improvement in strength by carbonation treatment was less obvious when the difference between the new and old mortar was larger.
Keywords:Modeled recycled aggregate concrete (MRAC)  Carbonation treatment  Compressive strength  Micro-hardness  Water-to-cement ratio  Simulation
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