Mechanical and thermal characterisation of geopolymers based on silicate-activated metakaolin/slag blends

Bernal, Susan A.; Rodríguez, Erich D.; Gutiérrez, Ruby Mejía de; Gordillo, M. C.; Provis, John L.

doi:10.1007/s10853-011-5490-z

Cited by 346 publications

(173 citation statements)

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“…are consistent with the loss of unbound (evaporable) water and adsorbed water present as condensed hydroxyl groups on the surface of the polymeric precursor (occurring between 100 -200 ºC) and dehydroxylation and pyrolysis of the PVA polymer (occurring between 250 -400 ºC) [30,36,37]. No significant changes in mass are observed above 550 ºC, indicating that this calcination temperature is sufficient for complete removal of the organic phases present in the polymeric precursor.…”

Section: Combined Differential Thermogravimetry -Mass Spectrometrysupporting

confidence: 70%

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Synthesis of stoichiometrically controlled reactive aluminosilicate and calcium-aluminosilicate powders

et al. 2016

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Section: Combined Differential Thermogravimetry -Mass Spectrometrysupporting

confidence: 70%

“…This peak is attributed to the decomposition of calcite (produced by the reaction of the CaO present in the precursor with CO2 released during combustion of PEG [37]) to free lime via the reaction CaCO3(s) C O CO2(g).…”

mentioning

confidence: 99%

Synthesis of stoichiometrically controlled reactive aluminosilicate and calcium-aluminosilicate powders

et al. 2016

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“…In contrast, F5S30 decreases in strength by 40% at 400°C and 50% at 800°C, as its structure is much more disrupted by the loss of chemically bound water from the relatively calcium-rich gels formed through combined fly ash-slag activation. The better strength retention of Al-Si rich gels compared to calcium-containing gels was also observed in alkali-activated metakaolin/slag blends [31]. Substitution of slag by 20% metakaolin led to relatively larger strength loss upon heating than in the unblended binder, attributed to the dehydroxylation of Ca-containing products formed in these systems.…”

Section: Thermal Resistancementioning

confidence: 66%

“…Substitution of slag by 20% metakaolin led to relatively larger strength loss upon heating than in the unblended binder, attributed to the dehydroxylation of Ca-containing products formed in these systems. It was also noted that the alkali-activated metakaolin binder (Al-Si rich gels) in that study gained some strength after exposure to 1000°C, while the slag blended binder did not [31].…”

Section: Thermal Resistancementioning

confidence: 69%

“…The temperature of the sintering point is affected by many factors, such as the solid materials, the calcium content, and the molar ratio of SiO2/Na2O used in the activator, which effectively defines geopolymer microstructure [42]. For example, the sintering point seems not to appear before 900°C if metakaolin is used as the raw material, and the samples are cured to maturity [31,43]. However, for less-mature samples derived from fly ash, when SiO2/Na2O increases from 0 to 2.0, the sintering point shifts from >900°C to 700°C at a liquid/solid ratio of 0.125.…”

Section: Thermal Resistancementioning

confidence: 99%

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Mechanical, thermal insulation, thermal resistance and acoustic absorption properties of geopolymer foam concrete

Zhang

Provis

Reid³

et al. 2015

Cement and Concrete Composites

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This study reports the synthesis and characterization of geopolymer foam concrete (GFC). A Class F fly ash with partial slag substitution was used for GFC synthesis by mechanical mixing of preformed foam. The GFCs exhibited 28 day compressive strengths ranging from 3 to 48 MPa with demolded densities from 720 to 1600 kg/m 3 (105°C oven-dried densities from 585 to 1370 kg/m 3 ), with the different densities achieved through alteration of the foam content.The thermal conductivity of GFCs was in the range 0.15 to 0.48 W/m·K, showing better thermal insulation properties than normal Portland cement foam concrete at the same density and/or at the same strength. The GFC derived from alkali activation of fly ash as a sole precursor showed excellent strength retention after heating to temperatures from 100 to 800°C, and the post-cooling compressive strength increased by as much as 100% after exposure at 800°C due to densification and phase transformations. Partial substitution of slag for fly ash increased the strength of GFC at room temperature, but led to notable shrinkage and strength Preprint of: Z Zhang, JL Provis, A Reid, H Wang, Mechanical, thermal insulation, thermal resistance and acoustic absorption properties of geopolymer foam concrete (GFC), Cement and Concrete Composites, 62(2015): 97-105. Final published version is at: http://dx.doi.org/10.1016/j.cemconcomp.2015.03.013 2 loss at high temperature. Thin GFC panels (20 -25 mm) exhibited acoustic absorption coefficients of 0.7-1.0 at 40 to 150 Hz, and 0.1-0.3 at 800 to 1600 Hz.

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Influence of Mix Design Parameters on Geopolymer Mechanical Properties and Microstructure

Lahoti

Yang

Tan

2017

Ceramic Engineering and Science Proceedings

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Mechanical and thermal characterisation of geopolymers based on silicate-activated metakaolin/slag blends

Cited by 346 publications

References 50 publications

Synthesis of stoichiometrically controlled reactive aluminosilicate and calcium-aluminosilicate powders

Synthesis of stoichiometrically controlled reactive aluminosilicate and calcium-aluminosilicate powders

Mechanical, thermal insulation, thermal resistance and acoustic absorption properties of geopolymer foam concrete

Influence of Mix Design Parameters on Geopolymer Mechanical Properties and Microstructure

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