Effects of nano-silica on hydration properties of tricalcium silicate

Xu, Zhenhai; Zhou, Zhen; Du, Peng; Cheng, Xin

doi:10.1016/j.conbuildmat.2016.09.003

Cited by 79 publications

(28 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Thus, the CNS forms a dense OPC mixture matrix. These results are consistent with those observed in previous studies using PNS [29,30,43,56] or CNS [7,34]. The total porosity also decreased as the amount of CNS increased, with 28-day total porosity being smaller than 1-day.…”

Section: Pore Structuresupporting

confidence: 92%

“…The 28-day samples in Figure 6b also show pore changes A previous study related to PNS reported that portlandite decreased rapidly during the first 7-day, which then declined slowly after 7-days. This indicates that most of the pozzolanic reactions occurred during the first 7-days [29]. There is almost no change in the ettringite and C-S-H peaks from 3-days to 28-days, as shown in Figure 5b.…”

Section: Hydration Productsmentioning

confidence: 83%

“…This is because nano-silica particles reduce the porosity of the matrix through the nucleation effect, pozzolanic reaction, and filler effect in cement hydration reaction. This effect is further enhanced with increasing amounts of nano-silica particles [7,8,21,[29][30][31]43,44,56]. Figure 6 also shows that as the amount of CNS increases, the pore size and amount decrease due to the effects mentioned above.…”

Section: Pore Structurementioning

confidence: 85%

“…The increase in the initial hydration rate caused by the pozzolanic reaction increases the amount of calcium-silicate-hydrate (C-S-H) gel [26][27][28]. Cement-based materials containing nano-silica particles demonstrate an improved performance due to the combined effects of the filler, nucleation, and pozzolanic reaction [29,30]. 2 of 20 Most of the previous research have focused on the powdered nano-silica (PNS) replacement percentages of less than 5% by binder weight [8,9,21,22,31], whereas a few studies have increased this fraction to reach 12% [27].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Characteristics of Ordinary Portland Cement Using the New Colloidal Nano-Silica Mixing Method

et al. 2019

View full text Add to dashboard Cite

This study applies a new method of mixing colloidal nano-silica (CNS). Previous studies have used powdered nano-silica or colloidal nano-silica and applied a binder weight substitution method. In this study, we tried to use ordinary Portland cement (OPC) as a binder and replace CNS with weight of mixing water. CNS was replaced by 10%, 20%, 30%, 40%, and 50% of the mixing water weight. The flow value, setting time, compressive strength, hydration reactant (X-ray diffractometer; XRD), pore structure (mercury intrusion porosimetry; MIP), thermal analysis, and scanning electron microscopy (SEM) analysis were performed. Experimental results show that the new substitution method improves the mechanical and microstructural properties through two effects. One is that the weight substitution of the mixing water shows a homogeneous dispersion effect of the nano-silica particles. The other is the effect of decreasing the w/b ratio when the CNS is substituted because the CNS is more dense than the mixing water. Therefore, we confirmed the applicability of mixing water weight replacement method as a new method of mixing CNS.

show abstract

Section: Pore Structuresupporting

confidence: 92%

Section: Hydration Productsmentioning

confidence: 83%

Section: Pore Structurementioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characteristics of Ordinary Portland Cement Using the New Colloidal Nano-Silica Mixing Method

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Furthermore, a decrement in the time required to reach the maximum rate was observed. It has been reported that silica nanoparticles, due to their ultrafine size, act as a nucleus for cement hydration, which results in faster formation of CH and more dynamic consumption of tricalcium silicate phase (C 3 S) during the binding period; in turn, this results in an accelerated cement hydration process (Xu et al 2016;Flores et al 2017;Kotsay 2017;Potapov et al 2019). As a result, the combination of seawater with NS resulted in a substantial acceleration of the hydration process.…”

Section: Resultsmentioning

confidence: 99%

The effects of seawater and nanosilica on the performance of blended cements and composites

Sikora

Lootens²,

Liard³

et al. 2020

Appl Nanosci

View full text Add to dashboard Cite

This study investigates the effects of seawater and nanosilica (3% by weight of cement), on the fresh and hardened properties of cement pastes and mortars produced with two types of low heat cements: Portland pozzolana cement (CEM II) and blast furnace cement (CEM III). The heat of hydration, initial and final setting times, rheological properties, strength development, sorptivity and water accessible porosity of the cement pastes and mortars were determined. The data reveal that cement type has a significant effect on the reaction rate of cement with seawater and nanosilica (NS). Specimens produced with slag-blended cement exhibited a higher cement reaction rate and the composite produced exhibited better mechanical performance, as a result of the additional reaction of alumina rich phases in slag, with seawater. Replacement of freshwater with seawater contributes mostly to a significant improvement of early strength. However, in the case of slag-blended cement, 28 day strength also improved. The incorporation of NS results in additional acceleration of hydration processes, as well as to a decrease in cement setting time. In contrast, the addition of NS results in a noticeable increment in the yield-stress of pastes, with this effect being pronounced when NS is mixed along with seawater. Moreover, the use of seawater and NS has a beneficial effect on microstructure refinement, thus improving the transport properties of cement mortars. Overall, the study has showed that both seawater and NS can be successfully used to accelerate the hydration process of low heat blended cements and to improve the mechanical and transport properties of cement-based composites.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

show abstract

Surface Modification of Nano-SiO₂ Particles with Polycarboxylate Ether-Based Superplasticizer under Microwave Irradiation

Huang

Wang

2017

ChemistrySelect

View full text Add to dashboard Cite

The mechanical properties and durability of cement‐based materials reinforced by nano‐SiO2 (NS) particles are strongly dependent on the dispersion characteristics of the latter. This study presents an innovative eco‐friendly method, which improves the distribution of NS particles through their surface modification using polycarboxylate ether‐based (PCE) superplasticizer containing silane coupling agent under microwave irradiation. The above method ensures the formation of a core‐shell‐shell structure, wherein the PCE shell exhibits enhanced electrostatic and steric hindrance repulsion properties. Moreover, after the surface modification, an improved compatibility between NS and PCE and a higher dispersion stability of NS in the saturated calcium hydroxide solution are attained, which is proved by the respective grafting ratios and encapsulation parameters of the surface‐modified NS particles. The proposed method application guarantees an enhanced fluidity of a fresh cement paste, which makes it lucrative for the production of critical components from nano‐reinforced cement‐based materials.

show abstract

Effects of nano-silica on hydration properties of tricalcium silicate

Cited by 79 publications

References 49 publications

Characteristics of Ordinary Portland Cement Using the New Colloidal Nano-Silica Mixing Method

Characteristics of Ordinary Portland Cement Using the New Colloidal Nano-Silica Mixing Method

The effects of seawater and nanosilica on the performance of blended cements and composites

Surface Modification of Nano-SiO₂ Particles with Polycarboxylate Ether-Based Superplasticizer under Microwave Irradiation

Contact Info

Product

Resources

About

Effects of nano-silica on hydration properties of tricalcium silicate

Cited by 79 publications

References 49 publications

Characteristics of Ordinary Portland Cement Using the New Colloidal Nano-Silica Mixing Method

Characteristics of Ordinary Portland Cement Using the New Colloidal Nano-Silica Mixing Method

The effects of seawater and nanosilica on the performance of blended cements and composites

Surface Modification of Nano-SiO2 Particles with Polycarboxylate Ether-Based Superplasticizer under Microwave Irradiation

Contact Info

Product

Resources

About

Surface Modification of Nano-SiO₂ Particles with Polycarboxylate Ether-Based Superplasticizer under Microwave Irradiation