Geopolymer foam concrete: An emerging material for sustainable construction

Zhang, Zuhua; Provis, John L.; Reid, Andrew; Wang, Hao

doi:10.1016/j.conbuildmat.2014.01.081

Cited by 635 publications

(276 citation statements)

References 127 publications

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“…At a density of 1000 kg/m 3 , the GFCs have a thermal conductivity of 0.24 W/m·K, which is lower than the range reported for PC foam concretes, 0.3 to 0.5 W/m·K, depending on the composition, fillers and testing conditions [4]. This is attributed to the low level of chemically bound water in the geopolymer gel, providing a more discontinuous gel structure in these materials.…”

Section: Thermal Insulationmentioning

confidence: 78%

“…and 1700 kg/m 3 , across a variety of foaming or density-reduction methods [4]. At a density of 1000 kg/m 3 , the GFCs have a thermal conductivity of 0.24 W/m·K, which is lower than the range reported for PC foam concretes, 0.3 to 0.5 W/m·K, depending on the composition, fillers and testing conditions [4].…”

Section: Thermal Insulationmentioning

confidence: 99%

“…This low thermal conductivity brings good thermal insulation, and usually energy efficiency in operation. Recent developments in alternative binders, and in engineering of products based on these binders, have led to the manufacture of foam concrete using geopolymer as the binder [4]. Geopolymers are a complex class of materials, principally manufactured through alkali hydroxide and/or silicate activation of a reactive aluminosilicate, in particular calcined clays (metakaolin) or fly ash [5].…”

Section: Introductionmentioning

confidence: 99%

“…Some special challenges related to this material require particular attention, such as understanding the differences between dense and foamed geopolymers [4]. This study has been conducted to investigate the key properties of GFCs, including compressive strength, acoustic absorption, thermal insulation and fire resistance.…”

mentioning

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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423

158

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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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Section: Thermal Insulationmentioning

confidence: 78%

Section: Thermal Insulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

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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423

158

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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

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1,137

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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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