Carbonation behaviour of recycled aggregate concrete |
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| Affiliation: | 1. CERis-ICIST, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal;2. CERis-ICIST, Barreiro Technology School, Polytechnic Institute of Setúbal, R. Américo da Silva Marinho, 2939-001 Barreiro, Portugal;3. CERis-ICIST, DECivil, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal;4. School of Civil Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK;5. Applying Concrete Knowledge, 1A Blakeney Avenue, Birmingham, B17 8AP, UK;1. Civil Engineering, ICIST, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal;2. ICIST, DECivil, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal;3. Concrete Engineering, School of Civil Engineering, University of Birmingham, B15 2TT, United Kingdom;4. Applying Concrete Knowledge, 1A Blakeney Avenue, Birmingham B17 8AP, United Kingdom;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. 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. College of Civil Engineering, Fuzhou University, Fuzhou 350116, China;2. Department of Structural Engineering, Tongji University, Shanghai 200092, China;3. College of Engineering, Fujian Jiangxia University, Fuzhou 350108, China |
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| Abstract: | This paper reviews the effect of incorporating recycled aggregates, sourced from construction and demolition waste, on the carbonation behaviour of concrete. It identifies various influencing aspects related to the use of recycled aggregates, such as replacement level, size and origin, as well as the influence of curing conditions, use of chemical admixtures and additions, on carbonation over a long period of time. A statistical analysis on the effect of introducing increasing amounts of recycled aggregates on the carbonation depth and coefficient of accelerated carbonation is presented. This paper also presents the use of existing methodologies to estimate the required accelerated carbonation resistance of a reinforced recycled aggregate concrete exposed to natural carbonation conditions with the use of accelerated carbonation tests. Results show clear increasing carbonation depths with increasing replacement levels when recycled aggregate concrete mixes are made with a similar mix design to that of the control natural aggregate concrete. The relationship between the compressive strength and coefficients of accelerated carbonation is similar between the control concrete and the recycled aggregate concrete mixes. |
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| Keywords: | Recycled aggregates Construction and demolition waste Carbonation Concrete Durability Service life design |
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