Effect of hybrid fibers, calcium carbonate whisker and coarse sand on mechanical properties of cement-based composites

M. Cao; L. Li; M. Khan

doi:10.3989/mc.2018.01717

Autores/as

M. Cao Department of Civil Engineering, Dalian University of Technology https://orcid.org/0000-0002-7917-4710
L. Li Department of Civil Engineering, Dalian University of Technology https://orcid.org/0000-0003-3966-6363
M. Khan Department of Civil Engineering, Dalian University of Technology https://orcid.org/0000-0003-2898-1827

DOI:

https://doi.org/10.3989/mc.2018.01717

Palabras clave:

Composite, Microfisuras, Carbonato cálcico, Resistencias a compresión, Resistencias a flexión

Resumen

En la actualidad se están desarrollando nuevos cementos compuestos reforzados con fibras híbridas (HyFRCC, por sus siglas en inglés). Estos nuevos cementos HyFRCC pueden impedir la microfisuración y aumentar la resistencia a compresión y flexotracción de las vigas, mediante la incorporación de filamentos de carbonato cálcico (CaCO₃), fibras de alcohol polivinílico (PVA) y fibras de acero. En este trabajo se plantea un procedimiento para optimizar la proporción de fibras (de acero y de PVA) y filamentos (de CaCO₃) en un nuevo HyFRCC. Se investiga la influencia de la arena gruesa en sus propiedades mecánicas, además de la resistencia a flexotracción de vigas y forjados a fin de adecuar la granulometría de la arena y la combinación de fibras en el nuevo material. Un buen ajuste entre el contenido y la granulometría de la arena y la proporción de las fibras y de los filamentos de CaCO₃ permite: incrementar la resistencia tanto a compresión como a flexotracción, la tenacidad a flexotracción y la resistencia a flexotracción equivalente; perfeccionar el comportamiento a flexión; y reducir la flecha de vigas y forjados endurecidos. La mezcla que mejores resultados arroja en conjunto contiene 1,5 % de fibras de acero, 0,4 % de fibras de PVA, 1 % de filamentos de CaCO₃ y arena gruesa optimizada.

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