Combined effect of nano-SiO2 and nano-Fe2O3 on compressive strength, flexural strength, porosity and electrical resistivity in cement mortars

M. A. Sanjuán; C. Argiz; J. C. Gálvez; E. Reyes

doi:10.3989/mc.2018.10716

Authors

M. A. Sanjuán Departamento de Ingeniería Civil: Construcción, E.T.S de Ingenieros de Caminos, Canales y Puertos, Universidad Politécnica de Madrid https://orcid.org/0000-0001-6694-0634
C. Argiz Departamento de Ingeniería Civil: Construcción, E.T.S de Ingenieros de Caminos, Canales y Puertos, Universidad Politécnica de Madrid https://orcid.org/0000-0003-4519-872X
J. C. Gálvez Departamento de Ingeniería Civil: Construcción, E.T.S de Ingenieros de Caminos, Canales y Puertos, Universidad Politécnica de Madrid https://orcid.org/0000-0001-9106-2917
E. Reyes Departamento de Ingeniería Civil: Construcción, E.T.S de Ingenieros de Caminos, Canales y Puertos, Universidad Politécnica de Madrid https://orcid.org/0000-0002-1284-7335

DOI:

https://doi.org/10.3989/mc.2018.10716

Keywords:

Active addition, Mortar, Compressive strength, Mechanical properties, Hydration

Abstract

The compressive strength, flexural strength, porosity and electrical resistivity properties of cement mortars with nano-Fe₂O₃ and nano-SiO₂ are studied. Amorphous silica is the main component of pozzolanic materials due to its reaction with calcium hydroxide formed from calcium silicate (C₃S and C₂S) hydration. The pozzolanic reaction rate is not only proportional to the amount of amorphous silica but also to the surface area available for reaction. Subsequently, fine nano-Fe₂O₃ and nano-SiO₂ particles in mortars are expected to improve mortar performance. The experimental results showed that the compressive strength of mortars with nano-Fe₂O₃ and nano-SiO₂ particles were lower than those obtained with the reference mortar at seven and 28 days. It was shown that the nano-particles were not able to enhance mechanical strength on every occasion. The continuous microstructural progress monitored by mercury intrusion porosimetry (MIP) measurements, pore-size distribution (PSD), total porosity and critical pore diameter also confirmed such results.

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References

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