Residue strength,water absorption and pore size distributions of recycled aggregate concrete after exposure to elevated temperatures |
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| Affiliation: | 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, Shenzhen University, China;3. Department of Construction Engineering, Faculty of Civil Engineering, Barcelona 08034, Spain;1. Université de Cergy-Pontoise, L2MGC, EA 4114, F-95000 Cergy-Pontoise, France;2. Université de Cergy-Pontoise, GEC, EA 4506, F-95000 Cergy-Pontoise, France;1. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong;2. Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, China;1. College of Civil Engineering, Qingdao University of Technology, Qingdao 266033, PR China;2. Centre for Future Materials, University of Southern Queensland, Toowoomba, QLD 4350, Australia;3. Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, PR China;4. Guangzhou University – Tamkang University Joint Research Center for Engineering Structure Disaster Prevention and Control, Guangzhou University, Guangzhou 510006, PR China;1. Escola Politecnica, Universidade de São Paulo, Av. Prof. Almeida Prado, trav. II, 05508-070 São Paulo, Brazil;2. LUNAM Université, IFSTTAR, MAST, GPEM, F-44340 Bouguenais, France |
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| Abstract: | In this paper, the effects of high temperature exposure of recycled aggregate concretes in terms of residual strengths, capillary water absorption capacity and pore size distribution are discussed. Two mineral admixtures, fly ash (FA) and ground granulated blast furnace (GGBS) were used in the experiment to partially replace ordinary Portland cement for concrete production. The water to cementitious materials ratio was maintained at 0.50 for all the concrete mixes. The replacement levels of natural aggregates by recycled aggregates were at 0%, 50% and 100%. The concretes were exposed separately to 300 °C, 500 °C and 800 °C, and the compressive and splitting tensile strength, capillary water coefficient, porosity and pore size distribution were determined before and after the exposure to the high temperatures. The results show that the concretes made with recycled aggregates suffered less deteriorations in mechanical and durability properties than the concrete made with natural aggregates after the high temperature exposures. |
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| Keywords: | Fly ash GGBS Recycled aggregate Compressive strength Porosity High temperature |
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