Effect of replacing natural sand with high levels of expanded vermiculite on the thermal and mechanical properties of coating mortars

I.M.S.  Barros; K. C.  Cabral; J.A.  Silva Neto; M.A.S. Anjos; R.A.  Araújo; F.L.M.  Rocha; G.M.  Nunes

doi:10.3989/mc.2025.392924

Autores/as

I.M.S. Barros Federal University of Rio Grande do Norte, UFRN - Federal University of Paraíba, UFPB https://orcid.org/0000-0002-8719-6055
K. C. Cabral Federal University of Rio Grande do Norte, UFRN https://orcid.org/0000-0001-7502-3002
J.A. Silva Neto Federal University of Paraíba, UFPB https://orcid.org/0000-0002-8355-1902
M.A.S. Anjos Federal University of Rio Grande do Norte, UFRN https://orcid.org/0000-0001-9563-2534
R.A. Araújo Federal University of Rio Grande do Norte, UFRN https://orcid.org/0000-0001-9265-9459
F.L.M. Rocha Federal University of Paraíba, UFPB https://orcid.org/0000-0002-0707-9140
G.M. Nunes Federal University of Paraíba, UFPB https://orcid.org/0000-0002-5519-3714

DOI:

https://doi.org/10.3989/mc.2025.392924

Palabras clave:

Vermiculita expandida., Revestimientos., Comportamiento termomecánico., Morteros

Resumen

Los morteros de revestimiento deben tener propiedades que garanticen un buen desempeño en la construcción. La vermiculita expandida, como sustituto del árido fino, reduce la conductividad térmica, la masa específica y la resistencia mecánica, lo que requiere estudiar los niveles de sustitución. Este estudio evaluó morteros 1:1:6 (cemento:cal:agregado) con un reemplazo de vermiculita entre el 25% y el 100%. Se realizaron ensayos para evaluar eficiencia energética, conductividad térmica, difusividad, densidad, porosidad y resistencia a la compresión y tracción. Los resultados mostraron que los morteros con un reemplazo de vermiculita del 25% y 50% ofrecieron el mejor equilibrio entre propiedades térmicas y mecánicas, siendo adecuados como revestimientos para mejorar el desempeño térmico sin comprometer la resistencia mecánica.

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