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Influence of SiO2, TiO2 and Fe2O3 nanoparticles on the properties of fly ash blended cement mortars

Journal Article (2020)
Author(s)

Ding Siang Ng (Monash University Malaysia)

Suvash Paul (International University of Business Agriculture and Technology, Monash University Malaysia)

Vivi Anggraini (Monash University Malaysia)

Sih Ying Kong (Monash University Malaysia)

Tanvir Shams Qureshi (University of Toronto)

C. Romero Rodriguez (TU Delft - Materials and Environment)

Qing feng Liu (Shanghai Jiao Tong University)

B. Savija (TU Delft - Materials and Environment)

Research Group
Materials and Environment
Copyright
© 2020 Ding Siang Ng, Suvash Chandra Paul, Vivi Anggraini, Sih Ying Kong, Tanvir Shams Qureshi, C. Romero Rodriguez, Qing feng Liu, B. Šavija
DOI related publication
https://doi.org/10.1016/j.conbuildmat.2020.119627
More Info
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Publication Year
2020
Language
English
Copyright
© 2020 Ding Siang Ng, Suvash Chandra Paul, Vivi Anggraini, Sih Ying Kong, Tanvir Shams Qureshi, C. Romero Rodriguez, Qing feng Liu, B. Šavija
Research Group
Materials and Environment
Volume number
258
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Abstract

This study explores the effects of different types of nanoparticles, namely nano-SiO2 (NS), nano-TiO2 (NT), and nano-Fe2O3 (NF) on the fresh properties, mechanical properties, and microstructure of cement mortar containing fly ash as a supplementary cementitious material. These nanoparticles existed in powder form and were incorporated into the mortar at the dosages of 1%, 3%, and 5% wt.% of cement. Also, fly ash has been added into in mortars with a constant dosage of 30% wt.% of cement. Compressive and flexural strength tests were performed to evaluate the mechanical properties of the mortar specimens with different nanoparticles at three curing ages, 7, 14, and 28 days. Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX) tests were conducted to study the microstructure and the hydration products of the mortars. To elucidate the effects of nanoparticles on the binder phase, additional experiments were performed on accompanying cement pastes: nanoindentation and open porosity measurements. The study shows that, if added in appropriate amounts, all nanoparticles investigated can result in significantly improved mechanical properties compared to the reference materials. However, exceeding of the optimal concentration results in clustering of the nanoparticles and reduces the mechanical properties of the composites, which is accompanied with increasing the porosity. This study provides guidelines for further improvement of concretes with blended cements through use of nanoparticles.