Publicado

2016-09-01

The mechanical properties of Portland cement mortars blended with carbon nanotubes and nanosilica: A study by experimental design

Propiedades mecánicas de morteros de cemento Portland adicionados con nanotubos de carbono y nanosilica: Estudio por diseño de experimentos

Palabras clave:

Carbon nanotubes, nanosilica, hybrid effect, pozzolanic activity, strength (en)
Nanotubos de carbono, nanosílice, efecto híbrido, actividad puzolánica, resistencia mecánica (es)

Autores/as

The pozzolanic effect of nanosilica (NS) particles when combined with Multi Walled Carbon Nanotubes (MWCNT) was studied in Ca(OH)2 pastes and Portland cement mortars. Experimental design techniques were used to plan the experiments and identify the effect of the nanoparticles on the properties of the cementing matrices by means of Analysis of Variance (ANOVA). Samples were prepared with different combinations of NS and MWCNT. Ca(OH)2 pastes were used to study the effect the nanoparticles had on the Calcium-Silicate-Hydrate (C-S-H) production. Portland cement mortars were used to study the effect of the nanoparticles on the compressive and flexural strength of the cementing matrices. We found that only NS had a significant effect on the C-S-H formation for up to 21 days of hydration, and that MWCNT did not present a positive effect on the mechanical strength of mortars due to the effects of reagglomeration.
El efecto puzolánico de partículas de nanosílice (NS) combinadas con Nanotubos de Carbono de Pared Múltiple (MWCNT) fue estudiado en pastas de Ca(OH)2 y morteros de cemento Pórtland. Técnicas de diseño experimental fueron aplicadas para planear los experimentos e identificar el efecto de las nanopartículas sobre las propiedades de las matrices cementantes usando Análisis de Varianza (ANOVA). Se prepararon muestras con diferentes combinaciones de NS y MWCNT. Las pastas de Ca(OH)2 fueron usadas para estudiar el efecto de las naopartículas en la producción de Silicato de Calcio Hidratado (C-S-H), y los morteros de cemento Pórtland se usaron para estudiar el efecto de las nanopartículas en las resistencias a compresión y flexo-tracción de las matrices. Se encontró que solo la NS tuvo un efecto significativo sobre la producción de C-S-H hasta 21 días de hidratación, y que los MWCNT no presentaron un efecto positivo sobre las propiedades mecánicas de los morteros debido a efectos de reagomeración.

Referencias

Tobón, J.I., Payá, J.J., Borrachero, M.V. and Restrepo, O.J., Mineralogical evolution of Portland cement blended with silica nanoparticles and its effect on mechanical strength. Construction and Building Materials, 36, pp. 736-742, 2012. DOI: 10.1016/j.conbuildmat.2012.06.043

Sanchez, F. and Sobolev, K., Nanotechnology in concrete – A review. Construction and Building Materials, 24(11), pp. 2060-2071, 2010. DOI: 10.1016/j.conbuildmat.2010.03.014

Hewlett, P., Lea´ s Chemistry of Cement and Concrete, 4th edition, Oxford: Elsevier Science & Technology Books, 2004.

Li, G., Wang, P. and Zhao. X., Mechanical behavior and microstructure of cement composites incorporating surface-treated multi-walled carbon nanotubes. Carbon, 43(6), pp. 1239-1245, 2005. DOI: 10.1016/j.carbon.2004.12.017

Yazdanbakhsh, A., Grasley, Z., Tyson, B. and Abu Al-Rub. R.K., Dispersion quantification of inclusions in composites. Composites Part A: Applied Science and Manufacturing, 42(1), pp. 75-83, 2011. DOI: 10.1016/j.compositesa.2010.10.005

Shih, J., Chang, T. and Hsiao, T., Effect of nanosilica on characterization of Portland cement composite. Materials Science and Engineering: A, 424, pp. 266-274, 2006. DOI: 10.1016/j.msea.2006.03.010

Srinivasan, S., Barbhuiya, S., Charan, D. and Pandey, S.P., Characterising cement–superplasticiser interaction using zeta

potential measurements. Construction and Building Materials, 24(12), pp. 2517-2521, 2010. DOI: 10.1016/j.conbuildmat.2010.06.005

Morsy, M.S., Alsayed, S.H. and Aqel, M., Hybrid effect of carbon nanotube and nano-clay on physico-mechanical properties of cement mortar. Construction and Building Materials, 25(1), pp. 145-149, 2011. DOI: 10.1016/j.conbuildmat.2010.06.046

Mendoza, O., Sierra, G. and Tobón, J.I., Influence of super plasticizer and Ca(OH)2 on the stability of functionalized multi-walled carbon nanotubes dispersions for cement composites applications. Construction and Building Materials, 47, pp. 771-778, 2013. DOI: 10.1016/j.conbuildmat.2013.05.100

Mendoza, O., Sierra, G. and Tobón, J.I., Effect of the reagglomeration process of multi-walled carbon nanotubes dispersions on the early activity of nanosilica in cement composites. Construction and Building Materials, 54, pp. 550-557, 2014. DOI: 10.1016/j.conbuildmat.2013.12.084

Rausch, J., Zhuang, RC. and Mäder, E., Surfactant assisted dispersion of functionalized multi-walled carbon nanotubes in aqueous media. Composites Part A: Applied Science and Manufacturing, 41(9), pp, 1038-1046, 2010. DOI: 10.1016/j.compositesa.2010.03.007

Mendoza, O. and Tobón, J.I., An alternative thermal method for identification of pozzolanic activity in Ca(OH)2/pozzolan pastes. Journal of Thermal Analysis and Calorimetry, 114, pp 589-596, 2013. DOI: 10.1007/s10973-013-2973-y

Frias, M., Villar-Cociña, E., Saánchez, M.I. and Valencia-Morales. E., The effect that different pozzolanic activity methods has on the kinetic constants of the pozzolanic reaction in sugar cane straw-clay ash/lime systems: Application of a kinetic–diffusive model. Cement and Concrete Research, 35(11), pp. 2137-2142, 2005. DOI: 10.1016/j.cemconres.2005.07.005

Makar, J.M. and Chan, G.W., Growth of cement hydration products on single-walled carbon nanotubes. Journal of the American Ceramic Society, 92(6), pp. 1303-1310, 2009. DOI: 10.1111/j.1551-2916.2009.03055.x

Cómo citar

[1]
“Propiedades mecánicas de morteros de cemento Portland adicionados con nanotubos de carbono y nanosilica: Estudio por diseño de experimentos”, DYNA, vol. 83, no. 198, pp. 136–141, Sep. 2016, doi: 10.15446/dyna.v83n198.55559.