Inorganic foams made from alkali-activated fly ash: Mechanical, chemical and physical properties

Hlaváček, Petr; Šmilauer, Vít; Škvára, František; Kopecký, Lubomír; Šulc, Rostislav

doi:10.1016/j.jeurceramsoc.2014.08.024

Cited by 153 publications

(98 citation statements)

References 18 publications

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“…A large standard derivation in compressive strength after heating, such as the large errors indicated in Fig. 7, has also been found in other research [32,33]. Fig.…”

Section: Thermal Resistancesupporting

confidence: 81%

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

Zhang

Provis

Reid³

et al. 2015

Cement and Concrete Composites

443

160

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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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“…A large standard derivation in compressive strength after heating, such as the large errors indicated in Fig. 7, has also been found in other research [32,33]. Fig.…”

Section: Thermal Resistancesupporting

confidence: 81%

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

Zhang

Provis

Reid³

et al. 2015

Cement and Concrete Composites

443

160

View full text Add to dashboard Cite

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“…A wide variety of routes to foamed alkali-activated materials have also been demonstrated [85][86][87][88][89][90][91], and these offer pathways to the reduction of operational energy.…”

Section: Simplified Environmental Assessmentmentioning

confidence: 99%

Alkali-activated materials

Provis

2018

Cement and Concrete Research

1,224

371

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This paper, which forms part of the UNEP White Papers series on Eco-Efficient Cements, provides a brief discussion of the class of cementing materials known as 'alkali-activated binders', which are identified to have potential for utilization as a key component of a sustainable future global construction materials industry. These cements are not expected to offer a like-for-like replacement of Portland cement across its full range of applications, for reasons related to supply chain limitations, practical challenges in some modes of application, and the need for careful control of formulation and curing. However, when produced using locallyavailable raw materials, with well-formulated mix designs (including in particular consideration of the environmental footprint of the alkaline activator) and production under adequate levels of quality control, alkali-activated binders are potentially an important and cost-effective component of the future toolkit of sustainable construction materials.

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“…As foaming agent hydrogen-peroxide [1,6,10] aluminum powder [7][8][9][10] or sodiumperborate [6] can be used. The cellular structure of geopolymers can be produced by introducing a large volume fraction of air bubbles into the paste.…”

Section: Introductionmentioning

confidence: 99%

“…Geopolymer foam (GPF) possess good physico-chemical and mechanical properties like low density, relative high strength, fire and chemical resistance, thermal stability, good thermal insulation properties [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Grinding Fineness of Fly Ash on the Properties of Geopolymer Foam

Szabó¹,

Gombkötő²,

Svéda³

et al. 2017

Archives of Metallurgy and Materials

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Present paper deals with the development of geopolymer foam prepared from ground F class power station fly ash. The effect of the fly ash fineness on the rheology of the geopolymer paste and the foam properties have been investigated. The raw fly ash was ground in a ball mill for various duration, 5, 10, 20, 30, 60 and 120 min. Geopolymer paste was prepared from the raw and ground fly ash with NaOH -sodium silicate mixture as alkaline activator. Geopolymer foam production was made using H 2 O 2 as foaming agent. Additionally, the geopolymer material structure was investigated by Fourier transform infrared spectrometer, the foam cell structure was monitored using optical microscopy. The rheological behaviour of the geopolymer paste changed due to the grinding of fly ash (from Bingham plastic to Newtonian liquid). Grinding of fly ash has a significant effect on the physical properties as well as on the cell structure of the geopolymer foam.

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Inorganic foams made from alkali-activated fly ash: Mechanical, chemical and physical properties

Cited by 153 publications

References 18 publications

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

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

Alkali-activated materials

Effect of Grinding Fineness of Fly Ash on the Properties of Geopolymer Foam

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