Effect of nano-SiO2 with different particle size on the hydration kinetics of cement

Meng, Tao; Hong, Yongpeng; Wei, Huadong; Xu, Qinglei

doi:10.1016/j.tca.2019.03.013

Cited by 71 publications

(19 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The hydration of tricalcium Silicate (C3S) and dicalcium Silicate (C2S) forms calcium hydroxide. The hydration rate of C3S is accelerated because the cement hydration is accelerated by the nucleation effect [30,31]. Therefore, calcium hydroxide release rate is increased, sooner available and favours the pozzolanic effect of nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of nano-clay on rheology, fresh properties, heat of hydration and strength of cement-based mortars

Dejaeghere

Sonebi

Schutter

2019

Construction and Building Materials

View full text Add to dashboard Cite

The objective of this research was to optimise the fresh mix properties, rheological parameters, heat of hydration and development of the compressive strength of cement mortars containing nano-clay (nCL) and fly ash (FA). All mixtures were made with water-to-binder ratio (W/B) of 0.40. The replacement of cement by FA was varied from 5% to 20% (by mass of cement), and dosages of superplasticiser (SP) and nCL were varied from 0.6% to 3% (by mass of binder), and 0.5% and 2.5% (by mass of cement), respectively. The fresh mix properties were evaluated by using mini-slump flow, Marsh cone flow time and Lombardi plate cohesion meter, and induced bleeding. Yield stress and viscosity were determined to analyse the effects on rheology. Variations in hydration kinetics were examined through calorimetry tests. Compressive strength was measured and evaluated at different ages up to 28 days. Dosages of nano-clay, fly ash and superplasticiser were the investigated key parameters. Statistical models and isoresponse curves were used to identify significant trends. Prediction models were developed for mini-slump, Marsh cone, Lombardi plate cohesion meter, heat of hydration, induced bleeding, static and dynamic yield stress, plastic viscosity, and compressive strengths at 1d, 3d, 7d, and 28 d as function of nCL, FA, and SP. Optimization of mortar proportioning to fulfil required performance levels in fresh and hardened states was possible by using the predicted models presented in this paper.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Nano-clay categorized as highly purified magnesium aluminium silicate, Acti-gel, is known to improve the performance of concrete [30,31]. Most aluminium silicates used commercially, are created by the dry method.…”

Section: Introductionmentioning

confidence: 99%

Influence of nano-clay on rheology, fresh properties, heat of hydration and strength of cement-based mortars

Dejaeghere

Sonebi

Schutter

2019

Construction and Building Materials

View full text Add to dashboard Cite

show abstract

“…Nano-SiO 2 (NS) is the common name for nano-sized silica particles with a diameter between 5 nm and 100 nm. NS particles are about 1000 times smaller than OPC particles [ 20 ]. Previous studies [ 21 , 22 ] found that NS can strengthen the cement matrix due to its smaller particles, high pozzolanic activity, and ability to form dense and compact microstructures.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

View full text Add to dashboard Cite

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.

show abstract

“…It was reported that the use of nano-SiO 2 shortened the setting time of belite–CSA pastes and CSA–PC pastes [ 30 ]. The early strength was also enhanced by the addition of nano-SiO 2 [ 31 , 32 , 33 ]. The reason was that nanoparticles could act as crystal nuclei to induce the initial ettringite formation and their filling effect also refined the microstructure.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Carbide Slag by Wet Grinding as an Accelerator in Calcium Sulfoaluminate Cement

Tan

et al. 2020

Materials

View full text Add to dashboard Cite

In this study, wet-ground carbide slag (i.e., WGCS) was utilized as an accelerator in calcium sulfoaluminate cement (CSA) for obtaining considerably faster setting processes for some special engineering processes such as plugging projects and rapid repair engineering. The WGCS–CSA system was designed, in which the replacement ratio of CSA by carbide slag was chosen as 4%, 8% and 12%. The setting time and compressive strength were measured, and the mechanism of the system hydration was studied in detail by means of calorimetry, XRD, thermogravimetry (TG) and SEM. The results showed that WGCS shortened the setting time of cement and significantly augmented the early strength. The addition of 8% of WGCS contributed to increasing the 2-h compressive strength from 4.2 MPa to 32.9 MPa. The decrease in the setting time and the increase in the initial strength were mainly attributed to the high initial pH value of the liquid phase and the high content of calcium ions in WGCS. Both these factors contributed to the ettringite formation and, at the same time, to the transformation of the morphology at a later time. Such results testify that WGCS can be used as an accelerator in the CSA system and also that it provides a novel approach to the reutilization of carbide slag.

show abstract

Effect of nano-SiO2 with different particle size on the hydration kinetics of cement

Cited by 71 publications

References 33 publications

Influence of nano-clay on rheology, fresh properties, heat of hydration and strength of cement-based mortars

Influence of nano-clay on rheology, fresh properties, heat of hydration and strength of cement-based mortars

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

Utilization of Carbide Slag by Wet Grinding as an Accelerator in Calcium Sulfoaluminate Cement

Contact Info

Product

Resources

About