Rheology of fly ash-based geopolymer: Effect of NaOH concentration

Rifaai, Yasser; Yahia, Ammar; Mostafa, Ahmed; Aggoun, Salima; Kadri, El-Hadj

doi:10.1016/j.conbuildmat.2019.07.028

Cited by 155 publications

(56 citation statements)

References 61 publications

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“…Palacios et al [18] reported that flow curves of sodium silicate-activated GGBFS pastes fit better to the Herschel-Bulkley model whereas NaOH-activated ones fit Bingham model. Rifaai et al [19] studied the flow and viscoelastic properties of NaOH-activated FA based geopolymers and reported the NaOH concentration dependence of the yield stress, the storage modulus, and the rigidification rate of the geopolymers. These rheological properties increase with an increase in NaOH concentrations up to 7 mol/L however, the higher concentrations of NaOH up to 14 mol/L cause a decrease in these parameters.…”

Section: Introductionmentioning

confidence: 99%

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

Dai

Aydın

Yardımcı

et al. 2020

Cement and Concrete Research

103

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Section: Introductionmentioning

confidence: 99%

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

Dai

Aydın

Yardımcı

et al. 2020

Cement and Concrete Research

103

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“…Initial and final set of GPC mixtures was determined with Vicat needle method, which is in accordance with ASTM C191 [ 44 ] with necessary modifications [ 45 ]. The method requires casting the fresh mixture into a truncated ring with a height of 40 mm.…”

Section: Experimental Programmentioning

confidence: 99%

Protective Geopolymer Coatings Containing Multi-Componential Precursors: Preparation and Basic Properties Characterization

et al. 2020

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This paper presents an experimental investigation on geopolymer coatings (GPC) in terms of surface protection of civil structures. The GPC mixtures were prepared with a quadruple precursor simultaneously containing fly ash (FA), ground granulated blast-furnace slag (GBFS), metakaolin (MK), and Portland cement (OPC). Setting time, compressive along with adhesive strength and permeability, were tested and interpreted from a perspective of potential applications. The preferred GPC with favorable setting time (not shorter than 120 min) and desirable compressive strength (not lower than 35 MPa) was selected from 85 mixture formulations. The results indicate that balancing strength and setting behavior is viable with the aid of the multi-componential precursor and the mixture design based on total molar ratios of key oxides or chemical elements. Adhesive strength of the optimized GPC mixtures was ranged from 1.5 to 3.4 MPa. The induced charge passed based on a rapid test of coated concrete specimens with the preferred GPC was 30% lower than that of the uncoated ones. Setting time of GPC was positively correlated with η[Si/(Na+Al)]. An abrupt increase of setting time occurred when the molar ratio was greater than 1.1. Compressive strength of GPC was positively affected by mass contents of ground granulated blast furnace slag, metakaolin and ordinary Portland cement, and was negatively affected by mass content of fly ash, respectively. Sustained seawater immersion impaired the strength of GPC to a negligible extent. Overall, GPC potentially serves a double purpose of satisfying the usage requirements and achieving a cleaner future.

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“…Structural evolution of metakaolin during geopolymerisation has also been investigated by some researchers [12,13] revealing that the rheological behavior is influenced by the activator type. Rifaai et al [14] studied the effect of activator content on the rheology of fly ash mixture, pointing out that the excessive NaOH in the solution led to lower yield stress, storage modulus and rigidification rate.…”

Section: Introductionmentioning

confidence: 99%

Influence of water to binder ratio on the rheology and structural Build-up of Alkali-Activated Slag/Fly ash mixtures

Dai

Aydın

Yardımcı

et al. 2020

Construction and Building Materials

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Rheology of fly ash-based geopolymer: Effect of NaOH concentration

Cited by 155 publications

References 61 publications

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

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

Protective Geopolymer Coatings Containing Multi-Componential Precursors: Preparation and Basic Properties Characterization

Influence of water to binder ratio on the rheology and structural Build-up of Alkali-Activated Slag/Fly ash mixtures

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