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Effects of activator properties and GGBFS/FA ratio on the structural build-up and rheology of AAC

Xiaodi Dai (UGent) , Serdar Aydin (UGent) , Mert Yücel Yardimci (UGent) , Karel Lesage (UGent) and Geert De Schutter (UGent)
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Abstract
The effects of ground granulated blast furnace slag/fly ash (GGBFS/FA) ratio, mass ratio of SiO2 to Na2O (M s ) of activator solution and sodium silicate dosage on structural build-up, flow properties and setting characteristics of alkali-activated cement (AAC) mixtures were investigated. The solid-like behavior becomes more dominant with increasing GGBFS/FA ratio. M, value had significant effect on the structural build-up. Significantly higher initial storage modulus with a low increasing rate was observed for the M, values lower than 0.8. However, for higher M, values, a sudden increase in storage modulus was observed after negligible initial structuration. An increase in sodium silicate dosage caused a considerable delay in the abrupt increase in the structural formation. It was observed that flow curves of AAC fit the Herschel-Bulkley model with shear-thickening behavior. ICP-OES tests revealed the lower release of aluminum and calcium into the pore solution of GGBFS/FA mixtures with low M, values.
Keywords
AGE REACTION-KINETICS, BLAST-FURNACE SLAG, FLY-ASH, MICROSTRUCTURAL DEVELOPMENT, CEMENTITIOUS MATERIALS, STRENGTH PROPERTIES, HYDRATION KINETICS, INORGANIC POLYMER, SILICATE HYDRATE, PART II, Alkali activated cement (D), Ground blast-furnace slag (D), Fly ash (D), Rheology (A), Pore solution (B), Structural build-up

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MLA
Dai, Xiaodi, et al. “Effects of Activator Properties and GGBFS/FA Ratio on the Structural Build-up and Rheology of AAC.” CEMENT AND CONCRETE RESEARCH, vol. 138, 2020, doi:10.1016/j.cemconres.2020.106253.
APA
Dai, X., Aydin, S., Yardimci, M. Y., Lesage, K., & De Schutter, G. (2020). Effects of activator properties and GGBFS/FA ratio on the structural build-up and rheology of AAC. CEMENT AND CONCRETE RESEARCH, 138. https://doi.org/10.1016/j.cemconres.2020.106253
Chicago author-date
Dai, Xiaodi, Serdar Aydin, Mert Yücel Yardimci, Karel Lesage, and Geert De Schutter. 2020. “Effects of Activator Properties and GGBFS/FA Ratio on the Structural Build-up and Rheology of AAC.” CEMENT AND CONCRETE RESEARCH 138. https://doi.org/10.1016/j.cemconres.2020.106253.
Chicago author-date (all authors)
Dai, Xiaodi, Serdar Aydin, Mert Yücel Yardimci, Karel Lesage, and Geert De Schutter. 2020. “Effects of Activator Properties and GGBFS/FA Ratio on the Structural Build-up and Rheology of AAC.” CEMENT AND CONCRETE RESEARCH 138. doi:10.1016/j.cemconres.2020.106253.
Vancouver
1.
Dai X, Aydin S, Yardimci MY, Lesage K, De Schutter G. Effects of activator properties and GGBFS/FA ratio on the structural build-up and rheology of AAC. CEMENT AND CONCRETE RESEARCH. 2020;138.
IEEE
[1]
X. Dai, S. Aydin, M. Y. Yardimci, K. Lesage, and G. De Schutter, “Effects of activator properties and GGBFS/FA ratio on the structural build-up and rheology of AAC,” CEMENT AND CONCRETE RESEARCH, vol. 138, 2020.
@article{8689601,
  abstract     = {{The effects of ground granulated blast furnace slag/fly ash (GGBFS/FA) ratio, mass ratio of SiO2 to Na2O (M s ) of activator solution and sodium silicate dosage on structural build-up, flow properties and setting characteristics of alkali-activated cement (AAC) mixtures were investigated. The solid-like behavior becomes more dominant with increasing GGBFS/FA ratio. M, value had significant effect on the structural build-up. Significantly higher initial storage modulus with a low increasing rate was observed for the M, values lower than 0.8. However, for higher M, values, a sudden increase in storage modulus was observed after negligible initial structuration. An increase in sodium silicate dosage caused a considerable delay in the abrupt increase in the structural formation. It was observed that flow curves of AAC fit the Herschel-Bulkley model with shear-thickening behavior. ICP-OES tests revealed the lower release of aluminum and calcium into the pore solution of GGBFS/FA mixtures with low M, values.}},
  articleno    = {{106253}},
  author       = {{Dai, Xiaodi and Aydin, Serdar and Yardimci, Mert Yücel and Lesage, Karel and De Schutter, Geert}},
  issn         = {{0008-8846}},
  journal      = {{CEMENT AND CONCRETE RESEARCH}},
  keywords     = {{AGE REACTION-KINETICS,BLAST-FURNACE SLAG,FLY-ASH,MICROSTRUCTURAL DEVELOPMENT,CEMENTITIOUS MATERIALS,STRENGTH PROPERTIES,HYDRATION KINETICS,INORGANIC POLYMER,SILICATE HYDRATE,PART II,Alkali activated cement (D),Ground blast-furnace slag (D),Fly ash (D),Rheology (A),Pore solution (B),Structural build-up}},
  language     = {{eng}},
  pages        = {{14}},
  title        = {{Effects of activator properties and GGBFS/FA ratio on the structural build-up and rheology of AAC}},
  url          = {{http://dx.doi.org/10.1016/j.cemconres.2020.106253}},
  volume       = {{138}},
  year         = {{2020}},
}

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