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
TLDR
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.Abstract:
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. The fundamental chemical and structural characteristics of geopolymers derived from metakaolin, fly ash and slag are explored in terms of the effects of raw material selection on the properties of geopolymer composites. It is shown that the raw materials and processing conditions are critical in determining the setting behavior, workability and chemical and physical properties of geopolymeric products. The structural and chemical characteristics that are common to all geopolymeric materials are presented, as well as those that are determined by the specific interactions occurring in different systems, providing the ability for tailored design of geopolymers to specific applications in terms of both technical and commercial requirements.read more
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Journal ArticleDOI
Alkali activation as new option for gold mine tailings inertization
Jenni Kiventerä,Isabella Lancellotti,Michelina Catauro,Francesco Dal Poggetto,Cristina Leonelli,Mirja Illikainen +5 more
TL;DR: In this article, the possibility of immobilizing several heavy metals from gold mine tailings by reactive geopolymerization technique has been investigated, and the results show that various elements (Cr, Cu, Ni, Zn and Mn) from goldmine tailings are able to immobilize almost completely by alkali activation with proper co-binder material.
Journal ArticleDOI
Synthesis of inorganic polymers using fly ash and primary lead slag
S. Onisei,Yiannis Pontikes,T. Van Gerven,George N. Angelopoulos,T. Velea,V. Predica,Petru Moldovan +6 more
TL;DR: Compressive strength is higher than 35 MPa in all cases and water absorption diminishes as the lead slag content increases, and a comparison of leaching results before and after polymerisation reveals that pH is an important factor as Pb is immobilised in the binding phase, unlike Zn and As.
Journal ArticleDOI
Behavior of combined fly ash/slag-based geopolymers when exposed to high temperatures
Maurice Guerrieri,Jay Sanjayan +1 more
TL;DR: In this article, the performance of combined fly ash and slag geopolymers at high temperature up to 800˚C was investigated and the compressive stress versus strain relationship was found that the ductility of the specimens decreased as the initial strength increased.
Journal ArticleDOI
Prediction of unconfined compressive strength of geopolymer stabilized clayey soil using Artificial Neural Network
TL;DR: Viability of ANN in predicting unconfined compressive strength (UCS) of geopolymer stabilized clayey soil has been investigated in this article, and the prediction performance of ANN model was compared to that of multi-variable regression (MVR) analysis.
Journal ArticleDOI
Efficiency and mechanism of stabilization/solidification of Pb(II), Cd(II), Cu(II), Th(IV) and U(VI) in metakaolin based geopolymers
TL;DR: In this article, heavy metal ions were proposed to form coordination bonds between the nonbridging Si O − and Al O − of GP framework (crosslinkers) leading to more effective stabilization of total ions in the GP matrix.
References
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Journal ArticleDOI
Geopolymers : inorganic polymeric new materials
TL;DR: In the last few years, technological progress has been made in the development of new materials such as "geopolymers" and new techniques, such as ''sol-gel'' as mentioned in this paper, opening up new applications and procedures and transforming ideas that have been taken for granted in inorganic chemistry.
Book
High-resolution solid-state NMR of silicates and zeolites
Günter Engelhardt,Dieter Michel +1 more
TL;DR: High-Resolution NMR of Solids and Adsorbed Molecules as mentioned in this paper is a well-known technique for high-resolution NMR for solids and adsorbed molecules.
Journal ArticleDOI
Industrially interesting approaches to “low-CO2” cements ☆
TL;DR: In this paper, the authors discuss the practicality of replacing portland cements with alternative hydraulic cements that could result in lower total CO 2 emissions per unit volume of concrete of equivalent performance.
Journal ArticleDOI
The geopolymerisation of alumino-silicate minerals
Hua Xu,J.S.J. van Deventer +1 more
TL;DR: In this paper, the effect of mineral properties on the compressive strength of the synthesized geopolymer was investigated, and it was shown that a wide range of natural Al-Si minerals could serve as potential source materials for the synthesis of geopolymers.