Mechanical and durability performance of sustainable structural concretes: An experimental study |
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| Affiliation: | 1. CERIS-ICIST, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;2. CERIS-ICIST, University of Stavanger, Postboks 8600, 4036 Stavanger, Norway;1. Department of Civil and Environmental Engineering, Polytechnic University of Catalonia, Jordi Girona, 1-3 B1 Building, Barcelona 08034, Spain;2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;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. Department of Civil Engineering, University of Salerno, via Giovanni Paolo II 132, 84084 Fisciano, SA, Italy;2. Department of Civil Engineering, COPPE, Federal University of Rio de Janeiro, P.O. Box 68506, CEP: 21945-970, Rio de Janeiro, Brazil;3. Faculty of Civil and Environmental Engineering, Institute of Construction and Building Materials, Technical University of Darmstadt, Franziska Braun Straße 3, 64287 Darmstadt, Germany |
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| Abstract: | This study reports the results of a wide experimental campaign intended at investigating the mechanical and durability performance of structural concretes made with Recycled Concrete Aggregates (RCAs) and coal Fly Ash (FA). To this end, twelve mixtures were designed by replacing part of the ordinary constituents (i.e. cement, sand and coarse aggregates) of a reference one with RCAs and FA. Samples of these mixtures were subjected to various tests aimed at assessing both their structural properties and durability performance. As for the former, time evolution of compressive strength was monitored at various curing times up to 365 days, and the splitting strength was determined at 28 days. Moreover, the expected durability performance of the aforementioned concrete mixtures was scrutinised by measuring some relevant physical quantities, such as water permeability, carbonation depth and chloride-ions ingress at various curing ages.The results obtained from these tests are often not self-evident, as they unveil the synergistic effect of combining both RCAs and FA on the resulting physical and mechanical properties of “green” concrete. Moreover, they demonstrate that the current code restrictions on the use of both RCAs and FA for structural concrete might be significantly relaxed, especially if the delayed binder effect, induced by the latter, is duly taken into account and, hence, concrete properties are measured at curing times longer than the conventional 28 days. |
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| Keywords: | Recycled aggregate concrete Fly ash Durability Water permeability Chloride-ion penetration Carbonation |
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