The significance of dispersion of nano-SiO2 on early age hydration of cement pastes

Pan, Feng; Chang, Honglei; Liu, Xin; Ye, Shaoxiong; Shu, Xin; Ran, Qianping

doi:10.1016/j.matdes.2019.108320

Cited by 135 publications

(28 citation statements)

References 37 publications

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“…However, some ENMs, such as SiO 2 , TiO 2 , Al 2 O 3 , CNT, graphene, and others, are often used to compensate for this drawback presenting excellent performances in terms of the early age strength gain (Wang & Park, 2015 ; Antiohos et al, 2014 ). Somewhere else, it was reported that the compressive strength of mortar with SiO 2 particles was higher than those of mortars containing silica fume at 7 and 28 days; SiO 2 behaves not only as a filler but also as an activator to promote pozzolanic reaction (Feng et al, 2020 ).…”

Section: Resultsmentioning

confidence: 99%

Ecological Drawbacks of Nanomaterials Produced on an Industrial Scale: Collateral Effect on Human and Environmental Health

Pérez‐Hernández

Pérez-Moreno

Sarabia-Castillo

et al. 2021

Water Air Soil Pollut

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Graphical abstract Currently, hundreds of different nanomaterials with a broad application in products that make daily lives a little bit easier, in every aspect, are being produced on an industrial scale at thousands of tons per year. However, several scientists, researchers, politics, and ordinary citizens have stated their concern regarding the life cycle, collateral effects, and final disposal of these cutting-edge materials. This review summarizes, describes, and discusses all manuscripts published in the Journal Citation Reports during the last 10 years, which studied the toxicity or the effects of nanomaterials on human and environmental health. It was observed that 23.62% of the manuscripts analyzed found no ecological or human risks; 54.39% showed that several nanomaterials have toxicological effects on the ecosystems, human, or environmental health. In comparison, only 21.97% stated the nanomaterials had a beneficial impact on those. Although only 54.39% of the manuscripts reported unfavorable effects of nanomaterials on ecosystems, human, or environmental health, it is relevant because the potential damage is invaluable. Therefore, it is imperative to make toxicological studies of nanomaterials with holistic focus under strictly controlled real conditions before their commercialization, to deliver to the market only innocuous and environmentally friendly products.

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Section: Resultsmentioning

confidence: 99%

Ecological Drawbacks of Nanomaterials Produced on an Industrial Scale: Collateral Effect on Human and Environmental Health

Pérez‐Hernández

Pérez-Moreno

Sarabia-Castillo

et al. 2021

Water Air Soil Pollut

View full text Add to dashboard Cite

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“…This phenomenon might be due to the dispersion of NS particles in the cement composite. The usage of more than adequate amounts of NS is considered to reduce efficiency due to the dispersion problem [ 63 ]. Figure 7 b shows the effect of MgO content on the heat release of UWC specimens.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the Hydration Characteristics and Anti-Washout Resistance of Non-Dispersible Underwater Concrete with Nano-SiO2 and MgO

et al. 2021

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In this paper, the effect of nano-SiO2 (NS) and MgO on the hydration characteristics and anti-washout resistance of non-dispersible underwater concrete (UWC) was evaluated. A slump flow test, a viscosity test, and setting time measurement were conducted to identify the impacts of NS and MgO on the rheological properties of UWC. The pH and turbidity were measured to investigate the anti-washout performance of UWC mixes. To analyze the hydration characteristics and mechanical properties, hydration heat analysis, a compressive strength test, and thermogravimetric analyses were conducted. The experimental results showed that the fine particles of NS and MgO reduced slump flow, increased viscosity, and enhanced the anti-washout resistance of UWC. In addition, both NS and MgO shortened the initial and final setting times, and the replacement of MgO specimens slightly prolonged the setting time. NS accelerated the peak time and increased the peak temperature, and MgO delayed the hydration process and reduced the temperature due to the formation of brucite. The compressive results showed that NS improved the compressive strength of the UWC, and MgO slightly decreased the strength. The addition of NS also resulted in the formation of extra C–S–H, and the replacement of MgO caused the generation of a hydrotalcite phase.

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“…The accumulated heat released by the addition of FNS was also greater than that of NS after 3 days of hydration. (Feng et al, 2020) The authors reported a significant increase in the heat flow of the cement paste samples with NS@PCE.…”

Section: Authorsmentioning

confidence: 95%

Influence of functionalized nanosilica with different functional groups in the properties of cementitious composites: A review

Fraga

Martins

Rêgo

2021

RSD

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The use of supplementary nano cementitious material (SNCM) to improve the mechanical properties and durability performances of cementitious composites (cement paste, mortar and concrete) has received remarkable attention in recent studies. The use of nanosilica as SNCM is a consolidated practice in the scientific community. However, recent developments in the synthesis of monodisperse and narrow-size distribution of nanoparticles by functionalization methods provide a significant improvement to the development of silica-group nano composites (among the functional groups: amine, carboxyls and glycol groups), the so-called functionalized nanosilica (FNS). This article aims to raise a literature review on the properties of FNS in cementitious materials and the advanced techniques of nano/micro structural analysis used to characterize cementitious composites containing FNS’s.

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The significance of dispersion of nano-SiO2 on early age hydration of cement pastes

Cited by 135 publications

References 37 publications

Ecological Drawbacks of Nanomaterials Produced on an Industrial Scale: Collateral Effect on Human and Environmental Health

Ecological Drawbacks of Nanomaterials Produced on an Industrial Scale: Collateral Effect on Human and Environmental Health

Evaluation of the Hydration Characteristics and Anti-Washout Resistance of Non-Dispersible Underwater Concrete with Nano-SiO2 and MgO

Influence of functionalized nanosilica with different functional groups in the properties of cementitious composites: A review

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