Studies on optimization of silica nanoparticles dosage in cementitious system

Singh, Latika; Ali, Dilshad; Sharma, U.

doi:10.1016/j.cemconcomp.2016.03.006

Cited by 75 publications

(26 citation statements)

References 36 publications

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“…From Figure 11, it is clearly seen that the relative compressive strength increases as a function of the dosage in all curing ages, with the maximum values produced by the dosage of 3%. This consequence is confirmed to other similar researchers reported by Nazari and Riahi [24] and Singh et al [25]. It could be explained by the so-called filler effect or seeding effect; that is, additional surface area could offer more nucleation sites.…”

Section: Effect Of Dosagesupporting

confidence: 81%

Modifying Cement Hydration with NS@PCE Core-Shell Nanoparticles

Ran²,

She

et al. 2017

Advances in Materials Science and Engineering

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It is generally accepted that fine particles could accelerate cement hydration process, or, more specifically, this accelerating effect can be attributed to additional surface area introduced by fine particles. In addition to this view, the surface state of fine particles is also an important factor, especially for nanoparticles. In the previous study, a series of nano-SiO 2 -polycarboxylate superplasticizer core-shell nanoparticles (NS@PCE) were synthesized, which have a similar particle size distribution but different surface properties. In this study, the impact of NS@PCE on cement hydration was investigated by heat flow calorimetry, mechanical property measurement, XRD, and SEM. Results show that, among a series of NS@PCE, NS@PCE-2 with a moderate shell-core ratio appeared to be more effective in accelerating cement hydration. As dosage increases, the efficiency of NS@PCE-2 would reach a plateau which is quantified by various characteristic values. Compressive strength results indicate that strength has a linear correlation with cumulative heat release. A hypothesis was proposed to explain the modification effect of NS@PCE, which highlights a balance between initial dispersion and pozzolanic reactivity. This paper provides a new understanding for the surface modification of supplementary cementitious materials and their application and also sheds a new light on nano-SiO 2 for optimizing cement-based materials.

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Section: Effect Of Dosagesupporting

confidence: 81%

Modifying Cement Hydration with NS@PCE Core-Shell Nanoparticles

Ran²,

She

et al. 2017

Advances in Materials Science and Engineering

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“…The next significant decline was detected between 400 and 550 °C, which can be linked to the CH dehydroxylation. The fourth and final decay was due to calcium carbonate, and clinker carbonation was found between 600 and 800 °C [ 46 , 47 ].…”

Section: Resultsmentioning

confidence: 99%

Development of a Novel Multifunctional Cementitious-Based Geocomposite by the Contribution of CNT and GNP

2021

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In this study, a self-sensing cementitious stabilized sand (CSS) was developed by the incorporation of hybrid carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) based on the piezoresistivity principle. For this purpose, different concentrations of CNTs and GNPs (1:1) were dispersed into the CSS, and specimens were fabricated using the standard compaction method with optimum moisture. The mechanical and microstructural, durability, and piezoresistivity performances, of CSS were investigated by various tests after 28 days of hydration. The results showed that the incorporation of 0.1%, 0.17%, and 0.24% CNT/GNP into the stabilized sand with 10% cement caused an increase in UCS of about 65%, 31%, and 14%, respectively, compared to plain CSS. An excessive increase in the CNM concentration beyond 0.24% to 0.34% reduced the UCS by around 13%. The addition of 0.1% CNMs as the optimum concentration increased the maximum dry density of the CSS as well as leading to optimum moisture reduction. Reinforcing CSS with the optimum concentration of CNT/GNP improved the hydration rate and durability of the specimens against severe climatic cycles, including freeze–thaw and wetting–drying. The addition of 0.1%, 0.17%, 0.24%, and 0.34% CNMs into the CSS resulted in gauge factors of about 123, 139, 151, and 173, respectively. However, the Raman and X-ray analysis showed the negative impacts of harsh climatic cycles on the electrical properties of the CNT/GNP and sensitivity of nano intruded CSS.

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“…Among the nanoparticles used in cementitious materials, the nanosilica stands out. The nanoparticles of silica (nanosilica) have superior reactivity when compared to the particles of the same chemical composition and of larger size, such as the silica fume (Puentes et al 2015;Nili et al 2015;Singh et al 2015a;Chen et al 2016, Alonso-Rodriguez et al 2017, as well as accelerate cement hydration reactions (Singh et al 2015a, Singh et al 2015b, Hou et al 2015, Singh et al 2016, Moon et al 2016. The C-S-H formed is more polymerized and has longer chains , Moon et al 2016.…”

Section: Introductionmentioning

confidence: 99%

“…at 2 days. This is probably due to the pozzolanic reaction of NS and to the accelerating effect of NS on cement hydration (Seekkuarachchi et al, 2008, Sanchez del Bosque et al, 2015, Singh et al, 2016, but also indicate the better synergism between MK and NS.…”

mentioning

confidence: 98%

Effect of Partial Substitution of Highly Reactive Mineral Additions by Nanosilica in Cement Pastes

Rêgo

Frías

Moragues

et al. 2019

J. Mater. Civ. Eng.

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The phenomena involved in portland cement hydration and interactions with nanosilica are very complex and not yet fully understood. In addition, few papers have currently proposed to investigate the microstructure and mechanical properties of ternary mixtures using portland cement, colloidal nanosilica, and highly reactive mineral additions. This article investigates, for the first time, the behavior of different highly reactive mineral additions (silica fume and metakaolin) when partially replaced by colloidal nanosilica in the microstructure and hydration of cementitious materials. For the study of the cementitious material microstructures, a Langavant calorimeter, compressive strength, Xray diffraction, thermogravimetry, infrared spectroscopy, and mercury intrusion porosimetry were used. The pastes with a 1% substitution of highly reactive mineral additions by nanosilica showed higher compressive strength and more refined porosity than the pastes with only silica fume or metakaolin. The results show that nanosilica appears to have better synergism with metakaolin than with silica fume.

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Studies on optimization of silica nanoparticles dosage in cementitious system

Cited by 75 publications

References 36 publications

Modifying Cement Hydration with NS@PCE Core-Shell Nanoparticles

Modifying Cement Hydration with NS@PCE Core-Shell Nanoparticles

Development of a Novel Multifunctional Cementitious-Based Geocomposite by the Contribution of CNT and GNP

Effect of Partial Substitution of Highly Reactive Mineral Additions by Nanosilica in Cement Pastes

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