Effect of further water curing on compressive strength and microstructure of CO2-cured concrete |
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| Affiliation: | 1. College of Civil Engineering, Hunan University, Changsha 410082, China;2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong;3. State Key Laboratory for Green Building Materials, China Building Materials Academy, Beijing 100024, China;1. Department of Chemical Engineering, The Federal Polytechnic, Bida, Nigeria;2. Department of Chemical Engineering, Federal University of Technology, Minna, Nigeria;1. College of Civil Engineering, Hunan University, 410082, China;2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong;1. Department of Civil Engineering, American University in Dubai, P.O. Box 28282, Dubai, United Arab Emirates;2. Department of Civil Engineering and Applied Mechanics, McGill University, 817 Sherbrooke Street West, Montreal, Quebec H3A 2K6, Canada;1. Federal University of Mato Grosso, UFMT/FAET, Cuiabá, Brazil;2. Civil Engineering Program, COPPE, Federal University of Rio de Janeiro, Brazil;3. School of Chemistry, Federal University of Rio de Janeiro, Brazil |
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| Abstract: | This study aims to investigate the effects of further water curing on the compressive strength and microstructure of CO2-cured concrete. The results showed that concrete with a residual w/c ratio of 0.25 showed the most rapid strength development rate upon further water curing due to hydration of uncarbonated cement particles. Thermogravimetric, IR-spectrophotometric and scanning electron microscope examinations indicated that further hydration of the cement particles could form C-S-H gel and ettringite crystals. The results showed that the calcite formed during the initial CO2 curing was consumed during the further hydration of C3A, and produced calcium monocarbonaluminate hydrate. Also, Ca(OH)2 was not detected due to its reaction with the formed silica gel. Mercury intrusion porosimetry test results indicated that the porosity and pore size of the CO2 cured mortar decreased further after water curing. |
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| Keywords: | Further water curing Residual w/c ratio Compressive strength Microstructure |
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