Influence of catalytic nano-additive for stabilization of β -dicalcium silicate and its hydration rate with different electrolytes

Maiti, Sanat Chandra; Ghoroi, Chinmay

doi:10.1016/j.cemconres.2017.04.008

Cited by 26 publications

(15 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous studies have described it as a new type of green low carbon cementitious material [2][3][4][5]. Its mineral components, β-C 2 S and C 12 A 7 , which are formed at low temperature, are in a metastable state, and possess hydration rates, setting times, strength and other properties that are significantly different from those of Portland cement [6,7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Fly Ash Belite Cement on Hydration Performance of Portland Cement

et al. 2021

View full text Add to dashboard Cite

Fly ash belite cement is a green, low carbon cementitious material, mainly composed of hydraulic minerals of dicalcium silicate and calcium aluminate. In this study, we used fly ash belite cement to control the setting time, hydration heat, strength, composition and microstructure of hydration products in Portland cement. Results showed that incorporating fly ash belite cement into Portland cement can shorten the setting time, accelerate hydration reaction speed, enhance early hydration heat release rate of silicate minerals and reduce total hydration heat. Moreover, replacing composite cement with 30% FABC causes the 90 d compressive strength of pastes and mortars to reach 107 and 46.2 MPa, respectively. The mechanical properties can meet the requirements of P·F 42.5 cement. During the hydration reaction process, clinker and Portland cement have a synergistic hydration effect. Notably, hydration of fly ash belite cement promotes the formation of C-S-H gel, Ettringite and calcium hydroxide, thereby significantly enhancing long-term strength. With the increase of FABC contents, the long-term strength would be improved with the densification of hydration products. The porosity has a great influence on the strength, and the high porosity was the main cause of the low early strength of FABC pastes. FABC and its composite cement show promise for mass concrete applications and can be applied as a setting agent for Portland cement.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Fly Ash Belite Cement on Hydration Performance of Portland Cement

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In this experiment, C 2 S and SSS synthesized by chemical reagents, respectively, were used as raw materials. C 2 S was prepared by traditional sintering process . According to the composition of C 2 S, analytical pure CaCO 3 and SiO 2 were mixed adequately with molar ratio of 2:1.…”

Section: Methodsmentioning

confidence: 99%

Crystallization and phase transition of tobermorite synthesized by hydrothermal reaction from dicalcium silicate

Pan

et al. 2020

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

In this paper, tobermorite was hydrothermally synthesized from the dicalcium silicate (C 2 S) in sodium silicate solution, and the crystallization and phase transition process were investigated in detail using XRD, Raman spectra, and SEM. The tobermorite is difficult to synthesize when the temperature is lower than 160°C because it gets converted into xonotlite (without Na 2 O) or pectolite (with Na 2 O) when the temperature is higher than 180°C. The crystallization process of tobermorite shows "S" trend with the increase in time, which can be divided into three stages: the nucleation stage, rapid crystal growth stage, and perfect crystal forming stage. During the crystallization, 90% of the crystallization of tobermorite is completed in the stage of rapid crystal growth. Raman spectra and SEM analysis show that with the increase in hydrothermal time, the C 2 S of monomer (Q 0 ) is first converted into the calcium silicate hydrate of sheet (Q 2 and Q 3 ), and then continues to convert into tobermorite of chain (Q 2 ). K E Y W O R D Scalcium silicate, crystallization, hydrothermal, raman spectra, tobermorite

show abstract

“…Small concentrations of various oxides have proven to have a stabilizing effect by forming solid solutions with C2S [28]. A recent study found that the addition of up to 3% of TiO 2 effectively stabilized the β-polymorph by substituting Si 4+ in the SiO 4 2− tetrahedron with Ti 4+ [29]. This suggests that the content of Ti may offer some stabilization to the β-C2S phase in the current samples, but the results require additional analysis that may be targeted in a later study.…”

Section: Slag Characteristics and Leachingmentioning

confidence: 99%

Recovery of Iron and Aluminum from Bauxite Residue by Carbothermic Reduction and Slag Leaching

Ekstroem

Bugten

Eijk

et al. 2021

J. Sustain. Metall.

View full text Add to dashboard Cite

The recovery of major components of bauxite residue by carbothermic reduction at 1550–1750 °C and subsequent slag leaching in a Na3CO3(aq) solution is studied. Iron recovers primarily to pig-iron and lime is added to tune the calcium aluminate slags towards the highly leachable mayenite phase. The concentration of aluminum in the leachate correlates well with the occurrence of mayenite and aluminum recoveries up to 50–60% are observed. However, slags with low CaO additions are vulnerable to gehlenite formation and display reduced leachabilities. Formation of an inhibiting layer of CaCO3(s) on the reaction surface of calcium-aluminate particles during leaching and immobilization of aluminum in CaTiO3(s) are also suggested to play important roles in limiting the aluminum leachability. Costs related to post-processing may be reduced by achieving disintegrating slags, a behavior which is observed for slags holding high γ- to β-Ca2SiO4 ratios. The disintegration is caused by the large volume expansion associated with the β-to-γ transformation and as such, various factors that are known to stabilize the β-polymorph are discussed. Graphical Abstract

show abstract

Influence of catalytic nano-additive for stabilization of β -dicalcium silicate and its hydration rate with different electrolytes

Cited by 26 publications

References 43 publications

Effect of Fly Ash Belite Cement on Hydration Performance of Portland Cement

Effect of Fly Ash Belite Cement on Hydration Performance of Portland Cement

Crystallization and phase transition of tobermorite synthesized by hydrothermal reaction from dicalcium silicate

Recovery of Iron and Aluminum from Bauxite Residue by Carbothermic Reduction and Slag Leaching

Contact Info

Product

Resources

About