Journal ArticleDOI
Mechanical property and structure of alkali-activated fly ash and slag blends
TLDR
In this paper, the properties and properties of fly ash and ground granulated blast furnace slag (GGBFS) blends were investigated via compressive strength testing, X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy/energy dispersive spectrography.Abstract:
Mechanical property and structure of alkali-activated fly ash (FA)/ground granulated blast furnace slag (GGBFS) blends were investigated via compressive strength testing, X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy/energy dispersive spectroscopy. It is shown that the incorporation of slag into solid precursors can improve compressive strength of the geopolymer binders and the optimal slag content ratio which will result in the highest strength is 0.8. GGBFS is relatively more reactive than FA in alkaline activation. The binder is predominantly a class of Al-substituted sodium calcium silicate hydrate (N-C-A-S-H) gel phase, which distributes around the solid particles homogeneously. Combining the results obtained from the glass diffraction maximum of XRD and the wavenumber of T-O-Si bands displayed in FTIR, it suggests that the degree of polymerization of geopolymer binders decreases and increases. This means that the microstructure of the bi...read more
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Journal ArticleDOI
Modification of phase evolution in alkali-activated blast furnace slag by the incorporation of fly ash
Idawati Ismail,Idawati Ismail,Susan A. Bernal,Susan A. Bernal,John L. Provis,John L. Provis,Rackel San Nicolas,Sinin Hamdan,Jannie S.J. van Deventer +8 more
TL;DR: The microstructural evolution of alkali-activated binders based on blast furnace slag, fly ash and their blends during the first six months of sealed curing is assessed in this article.
Journal ArticleDOI
Fly ash-based geopolymer: clean production, properties and applications
Xiao Yu Zhuang,Liang Chen,Liang Chen,Sridhar Komarneni,Chun Hui Zhou,Chun Hui Zhou,Chun Hui Zhou,Dong Shen Tong,Dong Shen Tong,Hui Min Yang,Wei Hua Yu,Hao Wang +11 more
TL;DR: In this article, the authors summarized and examined the scientific advances in the preparation, properties and applications of fly ash-based geopolymer and proposed a new green cement based on fly ash.
Journal ArticleDOI
Mechanical, thermal insulation, thermal resistance and acoustic absorption properties of geopolymer foam concrete
TL;DR: In this paper, a fly ash with partial slag substitution was used for GFC synthesis by mechanical mixing of preformed foam, and the GFCs exhibited 28 d compressive strengths ranging from 3 to 48 MPa with demolded densities from 720 to 1600 kg/m3 (105 °C oven-dried densities ranging from 585 to 1370 kg /m3), with the different densities achieved through alteration of the foam content.
Journal ArticleDOI
Fly ash-based geopolymers: The relationship between composition, pore structure and efflorescence
TL;DR: In this paper, the efflorescence of fly ash-based geopolymers is investigated. And the authors propose a relationship between alkali leaching from monosized fractured particles and the potential of efflorescence.
Journal ArticleDOI
Progressive utilisation prospects of coal fly ash: A review
TL;DR: The present review elucidates the role of CFA as an emerging input in delivering eco-friendly amenities and future derivatives and focuses on impending applications such as synthesis of geopolymers, silica aerogels, carbon nanotubes for electronic devices, and the separation of radioactive isotopes as well as rare earth elements from CFA.
References
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Journal ArticleDOI
Geopolymer technology: the current state of the art
Peter Duxson,Ana Fernández-Jiménez,John L. Provis,Grant C. Lukey,Ángel Palomo,J.S.J. van Deventer +5 more
TL;DR: A brief history and review of geopolymer technology is presented with the aim of introducing the technology and the vast categories of materials that may be synthesized by alkali activation of aluminosilicates as mentioned in this paper.
Journal ArticleDOI
Costs and carbon emissions for geopolymer pastes in comparison to ordinary portland cement
TL;DR: In this paper, the authors examined the lifecycle cost and carbon impacts of Ordinary Portland Cement (OPC) and geopolymers in an Australian context, with an identification of some key challenges for geopolymer development.
Journal ArticleDOI
The coexistence of geopolymeric gel and calcium silicate hydrate at the early stage of alkaline activation
TL;DR: In this paper, the effects of ground granulated blast furnace slag (GGBFS) on the microstructure and mechanical properties of metakaolin (MK) based geopolymers were studied.
Journal ArticleDOI
Composition and Microstructure of Alkali Activated Fly Ash Binder: Effect of the Activator
TL;DR: In this paper, the relationship between the mineralogical and microstructural characteristics of activated fly ash mortars and its mechanical properties has been established, and the results of the investigation show that in all cases (whatever the activator used) the main reaction product formed is an alkaline aluminosilicate gel, with low-ordered crystalline structure.