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http://bura.brunel.ac.uk/handle/2438/28926
Title: | Optimization of the preparation process of Fair-Faced concrete incorporating recycled aggregates |
Authors: | Li, W Jiang, T Jin, R Xu, Y |
Keywords: | recycled coarse aggregates;preparation process;fair-faced concrete;workability;mechanical properties;interfacial transition zone;two-stage mixing approach |
Issue Date: | 24-Feb-2022 |
Publisher: | Elsevier |
Citation: | Li, W. et al. (2022) 'Optimization of the preparation process of Fair-Faced concrete incorporating recycled aggregates', Construction and Building Materials, 326, 126908, pp. 1 - 13. doi: 10.1016/j.conbuildmat.2022.126908. |
Abstract: | Recycling construction wastes as aggregates to replace natural sources to produce concrete has attracted the attention of many researchers and is necessary for sustainable development. The water content of recycled coarse aggregate (RCA) and the concrete mixing approach in preparing fair-faced concrete incorporating recycled aggregates (FCRA) were optimized in this study. The results showed that the slump flow of FCRA exceeds 600 mm and that the 28-d compressive strength reaches approximately 40 MPa, which can meet the requirements of Chinese standards. Compared with concrete prepared with absolute dry RCA and with saturated surface dry RCA, the concrete prepared with semidry RCA better maintains its workability. The adverse effect on the compressive strength of concrete is weakened, which helps improve the structural performance of the ITZ of recycled aggregate concrete (RC). The concrete mixing approach has a significant influence on the physical and mechanical properties of FCRA. Compared with the ordinary mixing method, the 28-d strength of the concrete obtained by the cement stone wrapping approach is increased by 13.33%, and the surface pore area is reduced by 42.6%. Cement stone wrapping in two-stage mixing greatly improves the concrete performance, effectively satisfying the requirements for FCRA. |
URI: | https://bura.brunel.ac.uk/handle/2438/28926 |
DOI: | https://doi.org/10.1016/j.conbuildmat.2022.126908 |
ISSN: | 0950-0618 |
Other Identifiers: | ORCiD: Ruoyu Jin https://orcid.org/0000-0003-0360-6967 126908 |
Appears in Collections: | Dept of Civil and Environmental Engineering Research Papers |
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