Short Overview of the Effects of Nanoparticles on Mechanical Properties of Concrete

Niewiadomski, Paweł

doi:10.4028/www.scientific.net/kem.662.257

Cited by 13 publications

(7 citation statements)

References 6 publications

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“…Based on the literature review, it can be concluded that the content of microsilica in cementitious materials varies from 1.0 to 30.0 wt.%, nevertheless the recommended amount appears to be in the range from 5.0 to 15.0 wt.% [17]. At the same time, a dosage of nanoparticles varies from 0.5 to 12.0 wt.%; however, the optimum range appears to be between 1.0 and 4.0 wt.% [18]. In both situations amount of additive depends on the type of base material (cement paste, mortar, concrete) and the aim of the modification.…”

Section: Introductionmentioning

confidence: 97%

Cement Paste Mixture Proportioning with Particle Packing Theory: An Ambiguous Effect of Microsilica

et al. 2021

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Recently, the research of innovative building materials is focused on applying supplementary materials in the form of micro- and nanopowders in cementitious composites due to the growing insistence on sustainable development. Considering above, in paper, a research on the effect of microsilica and SiO2 nanoparticles addition to cement paste, designed with Andreasen and Andersen (AA) packing density model (PDM), in terms of its physical and mechanical properties was conducted. Density, porosity, compressive strength, hardness, and modulus of indentation were investigated and compared regarding different amount of additives used in cement paste mixes. Microstructure of the obtained pastes was analyzed. The possibility of negative influence of alkali-silica reaction (ASR) on the mechanical properties of the obtained composites was analyzed. The results of the conducted investigations were discussed, and conclusions, also practical, were presented. The obtained results confirmed that the applied PDM may be an effective tool in cement paste design, when low porosity of prepared composite is required. On the other hand, the application of AA model did not bring satisfactory results of mechanical performance as expected, what was related, as shown by SEM imaging, with inhomogeneous dispersion of microsilica, and creation of agglomerates acting as reactive aggregates, what as a consequence caused ASR reaction, crack occurrence and lowered mechanical properties. Finally, the study found that the use of about 7.5% wt. of microsilica is the optimum in regards to obtain low porosity, while, to achieve improved mechanical properties, the use of 4 wt. % of microsilica seems to be optimal, in the case of tested cement pastes.

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Section: Introductionmentioning

confidence: 97%

Cement Paste Mixture Proportioning with Particle Packing Theory: An Ambiguous Effect of Microsilica

et al. 2021

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“…Recent research on the influence of nanoparticle addition in the geopolymer composition has shown that compressive strength, bending strength and abrasion resistance as well as the workability can be improved by using silica and alumina nanoparticles [9]. The amount of nanoparticles related to the amount of cement is effective for properties of geopolymer concrete between 0.2-1.2 wt.…”

Section: Introductionmentioning

confidence: 99%

High Strength-Geopolymer Building Material

Paunescu¹,

VOLCEANOV²,

PAUNESCU³

2023

JESR

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New geopolymer concrete with high mechanical strength - 58.9 MPa after 28 days of curing - was experimentally made under environmental friendly and economic conditions. The high-strength-geopolymer is baed on coal fly ash and building concrete waste as geopolymer materials suitable for completely substituting the cement in concrete structure. The alumino-silicate geopolymer materials with binder role were activated in liquid alkaline medium (sodium silicate and sodium hydroxide) for facilitating the polymerization reaction that turns the alumino-silicate wastes into geopolymer concrete. The use for the first time in this experiment of recycled building concrete waste from demolition is the work originality.

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“…There is hope that this approach can also successfully improve the adhesion of the cement mortar used to make the overlay to the concrete substrate, as well as improve its functional properties. Based on an analysis of the subject of the literature concerning, e.g., the application of nanoparticles as an addition to the cement mortar used to make the overlay [45,46,47,48,49,50,51,52,53], one can see opportunities to improve its adhesion with the substrate and improve its functional properties.…”

Section: Introductionmentioning

confidence: 99%

The Development of Nanoalumina-Based Cement Mortars for Overlay Applications in Concrete Floors

Szymanowski

Sadowski

2019

Materials

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This article focuses on the development of nanoalumina-based cement mortars for overlay applications in concrete floors. It focuses on the effect of applying aluminum oxide (Al2O3) nanopowder to the cement mortar used to make the overlay, on the adhesion of this overlay to concrete substrate and on its functional properties. It was claimed that the addition of 0.5% of Al2O3 nanopowder has a positive effect on the adhesion of the cement mortar used to make the overlay to the substrate made of concrete. The prior studies performed using scanning electron microscopy (SEM) confirmed that the reason for the improvement in adhesion is the fact that cement mortar used to make the overlay with the addition of 0.5% of Al2O3 nanopowder is less porous than the reference mortar within the interphase. The article concurs that the most favorable results, in terms of lower abrasion resistance and higher subsurface tensile strength of the cement mortar used to make the overlay, are mainly brought about by adding 0.5% of Al2O3 nanopowder.

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Short Overview of the Effects of Nanoparticles on Mechanical Properties of Concrete

Abstract: Short survey of the literature revealed that the addition of nanoparticles, e.g., nano- SiO2, Al2O2, CuO, TiO2, ZnO2, Fe2O3, Cr2O3 in concrete result in improvement of its physical and mechanical properties.

Cited by 13 publications

References 6 publications

Cement Paste Mixture Proportioning with Particle Packing Theory: An Ambiguous Effect of Microsilica

Cement Paste Mixture Proportioning with Particle Packing Theory: An Ambiguous Effect of Microsilica

High Strength-Geopolymer Building Material

The Development of Nanoalumina-Based Cement Mortars for Overlay Applications in Concrete Floors

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