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Physical, mechanical, and thermal properties of concrete roof tiles produced with vermiculite

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Abstract

This study aimed to evaluate the effect of using expanded vermiculite and its impact on the production of concrete roof tiles. The control treatment and replacement of 12.5, 25, 37.5, and 50% sand by vermiculite were evaluated. The concrete roof tiles were moulded by the simultaneous pressing and extrusion mechanical process. The control trace was comprised by 21.95% CPV-ARI cement, 65.85% sand, and 12.20% limestone. After production, the concrete roof tiles were cured for 28 days. The physical (roof tiles classification, samples dry weight, water absorption, and porosity), mechanical (splitting tensile strength), and microstructural properties were evaluated. All treatments were assessed before and after accelerated ageing. The thermal properties of the modification in the concrete roof tiles’ composition were also analysed. The evaluated amounts of vermiculite significantly affected the physical, mechanical, and thermal properties of concrete roof tiles. The use of vermiculite in concrete roof tiles reduced their dry weight and thermal conductivity, not impairing their durability. The use of 31.0% vermiculite in concrete roof tiles was suggested for better thermal insulation optimization (20.29% reduction) and weight reduction (7.92% and 7.94% at 28 days of curing and after accelerated ageing, respectively), along with adequate physical, mechanical, and durability properties.

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All data generated or analysed during this study are included in this published article.

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Acknowledgements

The authors would like to thank the National Council for Scientific and Technological Development (CNPq – Grant 305214/2017-9; Grant 305662/2020-1), the Minas Gerais State Agency for Research and Development (FAPEMIG—project CAG APQ 00891-16), the Financier of Studies and Projects (FINEP), the Coordination for the Improvement of Higher Education Personnel (CAPES), and the Losango Roof Tiles Company for their support.

Funding

Fundação de Amparo à Pesquisa do Estado de Minas Gerais—FAPEMIG—APQ-00891–16.

National Council for Scientific and Technological Development (CNPq – Grant 305214/2017–9; Grant 305662/2020–1).

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Authors and Affiliations

Authors

Contributions

QSV—Investigation; methodology; writing, review and editing.

TMCE—Investigation; methodology.

TPF—Investigation; methodology.

JRSS—Investigation; supervision.

RFM—Conceptualization; funding acquisition; investigation; methodology; resources; supervision; writing, review and editing.

All authors read and approved the final manuscript.

Corresponding author

Correspondence to Rafael Farinassi Mendes.

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The authors declare no competing interests.

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Responsible Editor: Philippe Garrigues

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Viana, Q.S., Eugênio, T.M.C., Sabino, T.P.F. et al. Physical, mechanical, and thermal properties of concrete roof tiles produced with vermiculite. Environ Sci Pollut Res 29, 48964–48974 (2022). https://doi.org/10.1007/s11356-022-19337-1

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  • DOI: https://doi.org/10.1007/s11356-022-19337-1

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