Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 139, Issue -, Pages 570-583Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2016.09.091
Keywords
Seashell aggregates; Non-structural concrete; Plain structural concrete; Mechanical properties; Permeability
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Funding
- Centre for the Development of Industrial Technology (CDTI in Spain) under the FEDER-Innterconecta Program [00064742/ITC-20133094]
- European Union ERDF funds
- MINECO [BIA2014-58063-R]
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In this work the performance of mussel shell as aggregate in plain concrete has been studied. The mussel shell used came from the cannery industry, which produces more than 1 million tonnes of shell by-product a year worldwide. The mussel shell has been heat-treated at 135 degrees C for 30 min and then crushed and sieved into sand and gravel. The new aggregates have been studied by X-ray diffraction (XRD), TGA and SEM microscopy. Then two different conventional concretes were designed, a non-structural concrete (NSC) and a plain structural concrete (SC). In both of them the natural aggregates (sand, gravel, and both sand and gravel) were replaced with mussel shell aggregates at different percentages. All concretes were characterized in fresh and hardened states (microstructure, workable life progression, workability, compressive and splitting strength, longitudinal modulus of elasticity, weight loss and water permeability). The results lead to establishing that with this treatment, mussel shell replacement should be limited to 25% of fine or coarse aggregates, or 12.5% of both fine and coarse aggregates. With these percentages the NSC and the SC will display a correct behaviour. (C) 2016 Elsevier Ltd. All rights reserved.
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