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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Characterizations of flax fabric reinforced nanoclay-geopolymer composites
TL;DR: In this paper, the nanoclay platelets are added to reinforce the geopolymer matrices at 1.0, 2.0%, and 3.0% by weight, which enhances the adhesion between the polygonal matrix and flax fibres.
Journal ArticleDOI
Fire resistant melamine based organic-geopolymer hybrid composites
TL;DR: Hybrid composite materials based on geopolymer and epoxy melamine resins have been designed to produce a novel material showing high compatibility between the organic and inorganic phases as mentioned in this paper, which has been realized through a synthetic method based on the co-reticulation in mild condition of the two phases.
Journal ArticleDOI
Setting, Strength, and Autogenous Shrinkage of Alkali-Activated Fly Ash and Slag Pastes: Effect of Slag Content
TL;DR: It is shown that fresh properties largely depend on the type of precursor (GBFS or FA) and the slump and setting time of GBFS-rich pastes was significantly reduced, and the optimum GBFS/FA ratio for their future use in concretes is recommended.
Journal ArticleDOI
Durability of very high volume fly ash cement pastes and mortars in aggressive solutions
TL;DR: In this paper, the resistance of very high volume fly ash cement pastes and mortars activated by Na 2 SO 4 has been monitored following immersion for up to 90 d in 0.1 M HCl, 4.4% Na 2SO 4 and ASTM-compliant sea water.
Journal ArticleDOI
Improvement of the early and final compressive strength of fly ash-based geopolymer concrete at ambient conditions
TL;DR: In this paper, the effects of sodium hydroxide ratio, external heat amount, and partial Portland cement replacement on fly ash-based geopolymer concrete were investigated and the early compressive strength, density, absorption, and permeable voids were measured, and the microstructure of the fly-ash-based paste was observed and characterized.
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.
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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.