Influence of MgO on Sintering and Property of Belite-Barium Calcium Sulphoaluminate Cement

Lu, Lei; Wang, Shou De; Wang, Hui

doi:10.4028/www.scientific.net/amm.152-154.68

Cited by 3 publications

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References 3 publications

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“…At 6 h, it is observed that a continuous hydration film is formed on the surface of specimen, which are consist of hydrated calcium sulphoaluminate and alumina gel. From the micrographs of location 2 at which much C 2.75 B (26). Therefore, it is reasonable to speculate that the solid solution of sulphur for belite in the binary system lowers down, which inevitably leads to an excessive amount of sulphur in the specimen No.1 and promotes the formation of AFt.…”

Section: Formation Mechanism Discussionmentioning

confidence: 99%

“…Thus, many investigations were performed in an attempt to introduce another high early-strength mineral with low CaO such as C 4 (26,27). Consequently, belite-C 2.75 B 1.25 A 3 $ system, with the designed composition of 9.0% C 2.75 B 1.25 A 3 $, 75% silicate mineral and 16% intermediate phase (by weight, as following) (28,29), has the potential to receive attention nowadays.…”

Section: Introductionmentioning

confidence: 99%

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Formation and early hydration characteristics of C2.75B1.25A3$ in binary system of C2.75B1.25A3$-C2S

et al. 2016

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C 2.75 B 1.25 A 3 $ (2.75CaO•1.25BaO• 3Al 2 O 3 • SO 3 ) is one of the important minerals and it governdirectly the early-strength of belite-barium calcium sulphoaluminate cement. In this paper a binary system C 2.75 B 1.25 A 3 $-C 2 S is selected to investigate the formation of C 2.75 B 1.25 A 3 $. In the range of 1100 °C-1200 °C, the earlier formed C 2 S hinders the formation of C 2.75 B 1.25 A 3 $. On the contrary, when the temperature is in the range of 1200 °C-1350 °C, the initially formed C 2 S could provide a surface for the nucleation of C 2.75 B 1.25 A 3 $ and cut down the potential barrier (ΔG k* ) for the heterogeneous nucleation of C 2.75 B 1.25 A 3 $, which contributes to its formation. Moreover, at 1350 °C, the large amount of previously formed C 2 S benefits the extent of formation of C 2.75 B 1.25 A 3 $. The possible reason was that it could prevent sulfur evaporation. In early hydration age, AFm and AFt originating from C 2.75 B 1.25 A 3 $ hydration are found within 2 h and 12 h under 95% RH at 1 °C, respectively, whereas C 2 S is unhydrated at this moment. ) es una de las principales fases, y regula directamente la resistencia inicial del cemento. En este trabajo, se ha seleccionado el sistema binario C 2.75 B 1.25 A 3 $-C 2 S para investigar la formación de C 2.75 B 1.25 A 3 $. En el rango de 1100 °C-1200 °C, el C 2 S formado anteriormente impide la formación de C 2.75 B 1.25 A 3 $, mientras que cuando la temperatura está entre 1200 °C-1350 °C, el C 2 S proporcionaría una superficie de nucleación de C 2.75 B 1.25 A 3 $ reduciendo la barrera de potencial (ΔG k* ) para la nucleación heterogénea de C 2.75 B 1.25 A 3 $, lo que contribuye a su formación. Además, a 1350 °C, la gran cantidad de C 2 S for mado beneficia la formación de C 2.75 B 1.25 A 3 $, ya que podía prevenir la evaporación del azufre. En las primeras etapas de la hidratación (entre 2 y 12h y 95% HR a 1 ºC) se pueden encontrar AFM y AFt procedentes de la hidratación de C 2.75 B 1.25 A 3 $, mientras que el C 2 S permanece sin hidratar. KEYWORDS:

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Section: Formation Mechanism Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formation and early hydration characteristics of C2.75B1.25A3$ in binary system of C2.75B1.25A3$-C2S

et al. 2016

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“…One method involves activating the dicalcium silicate by stabilising high-temperature polymorphs with quick cooling, or modifying their crystal microstructure through the inclusion of ions (Cuesta et al, 2012;Kacimi et al, 2010;Staněk et al, 2011;Ying et al, 2009). Another is the preparation of cement in which initial strength development is due to the rapid hydration of other phases with low calcium oxide content such as calcium aluminosulfate (C 4 A 3 S) (Berger et al, 2011;Liu et al, 2002;Martín-Sedeño et al, 2010;PelletierChaignat et al, 2011) or barium calcium sulfoaluminate (C 2 : 75 B 1 : 25 A 3 S) (Cheng et al, 2000;Cheng et al, 2004;Lu et al, 2008;Lu et al, 2010;Zhang et al, 2007).…”

Section: Introductionmentioning

confidence: 97%

Formation mechanism of barium calcium sulfoaluminate mineral

Wang¹,

Huang²,

Gong³

et al. 2014

Advances in Cement Research

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Barium calcium sulfoaluminate (C 2 : 75 B 1 : 25 A 3 S _ ) mineral was prepared with analytical pure chemical reagents calcium carbonate, aluminium oxide, barium carbonate and barium sulfate. The sintering temperature and formation mechanism of the C 2 : 75 B 1 : 25 A 3 S _ mineral were investigated by X-ray diffraction, differential scanning calorimetry/ thermogravimetric analysis, scanning electron microscopy and infrared spectrometer analysis. The effect of iron (III) oxide on the C 2 : 75 B 1 : 25 A 3 S _ mineral formation is discussed. The experimental results show that the beginning formation temperature, the large-amount formation temperature and decomposition temperature for C 2 : 75 B 1 : 25 A 3 S _ mineral are 11008C, 13508C and 13708C respectively. C 2 : 75 B 1 : 25 A 3 S _ mineral is formed by solid reaction with 12CaO.7Al 2 O 3 (C 12 A 7 ), monocalcium aluminate (CA) or monobarium aluminate (BA) regarded as the interphase, as verified by variation of the Gibbs free energy of the reaction. An appropriate amount of iron (III) oxide can replace alumina to form iron-bearing C 2 : 75 B 1 : 25 A 3 S _ .

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Effect of rich-MgO from low-calcium limestone on the calcination and properties of C4A3$-C2S clinker

Qiu,

Li,

Zhang

et al. 2024

Green Energy and Resources

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Influence of MgO on Sintering and Property of Belite-Barium Calcium Sulphoaluminate Cement

Cited by 3 publications

References 3 publications

Formation and early hydration characteristics of C<sub>2.75</sub>B<sub>1.25</sub>A<sub>3</sub>$ in binary system of C<sub>2.75</sub>B<sub>1.25</sub>A<sub>3</sub>$-C<sub>2</sub>S

Formation and early hydration characteristics of C<sub>2.75</sub>B<sub>1.25</sub>A<sub>3</sub>$ in binary system of C<sub>2.75</sub>B<sub>1.25</sub>A<sub>3</sub>$-C<sub>2</sub>S

Formation mechanism of barium calcium sulfoaluminate mineral

Effect of rich-MgO from low-calcium limestone on the calcination and properties of C4A3$-C2S clinker

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