Journal ArticleDOI
Use of reservoir sludge as a partial replacement of metakaolin in the production of geopolymers
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In this article, the compressive strengths of reservoir sludge-based geopolymers (RSBG) were measured and compared, and the effects of water/binder ratio, stirring time and curing temperature on compressive strength were investigated.Abstract:
Reservoir sludge was first calcined at 850 °C for 6 h and then employed as 50%, 70% and 100% replacement of metakaolin in the production of geopolymers. Various proportions of slag, metakaolin and calcined reservoir sludge (CRS) particles were mixed with different alkaline activating solutions to produce reservoir sludge-based geopolymers (RSBG). Furthermore, the compressive strengths of RSBG geopolymers were measured and compared. Based on the experimental results, proper alkaline activating solutions that produce higher compressive strengths of RSBG geopolymers with various replacement percentages of metakaolin by CRS particles and different water/binder ratios were determined. At the same time, the effects of water/binder ratio, stirring time and curing temperature on the compressive strengths of RSBG geopolymers were investigated. In addition, the flow values and compressive strengths of RSBG mortars were measured and then compared to those of Portland cement mortars to evaluate the efficiency of using RSBG geopolymers as binders in mortars.read more
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Journal ArticleDOI
Alkali-activated metakaolin: A short guide for civil Engineer – An overview
TL;DR: A comprehensive overview of the previous works carried out on the use of metakaolin in alkali activation can be found in this paper, where the authors present a new binders as an alternative to Portland cement (PC).
Journal ArticleDOI
Improved geopolymerization of bottom ash by incorporating fly ash and using waste gypsum as additive
TL;DR: In this article, the improvement of the geopolymerization of bottom ash by incorporating fly ash (FA) and using flue gas desulfurization gypsum (FGDG) as additive was studied.
Journal ArticleDOI
Management and valorisation of wastes through use in producing alkali‐activated cement materials
TL;DR: In this paper, a review of the potential advantages and pitfalls associated with the application of alkali-activation technology to a wide variety of wastes that have been claimed to be suitable for the production of construction materials is presented.
Journal ArticleDOI
Application of alkali-activated materials for water and wastewater treatment: a review
Tero Luukkonen,Tero Luukkonen,Anne Heponiemi,Hanna Runtti,Janne Pesonen,Juho Yliniemi,Ulla Lassi,Ulla Lassi +7 more
TL;DR: Alkali-activation (or geopolymer) technology has gained a great deal of interest for its potential applications in water and wastewater treatment during the last decade as mentioned in this paper, and a comprehensive evaluation of the rapidly growing prospects of alkali activation technology in water-and wastewater treatment is presented in this paper.
Journal ArticleDOI
Use of reservoir clay sediments as raw materials for geopolymer binders
TL;DR: Among low cost or readily available raw materials, reservoir clay sediments are of interest as potential precursors in geopolymer binder manufacture as mentioned in this paper, and these materials come from dredging of r...
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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Alkali-activated fly ashes: A cement for the future
TL;DR: In this paper, the mechanism of activation of fly ash with highly alkaline solutions is described, and the product of the reaction is an amorphous aluminosilicate gel having a structure similar to that of zeolitic precursors.
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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.
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Understanding the relationship between geopolymer composition, microstructure and mechanical properties
Peter Duxson,John L. Provis,Grant C. Lukey,Seth W. Mallicoat,Waltraud M. Kriven,Jannie S.J. van Deventer +5 more
TL;DR: In this paper, a mechanistic model accounting for reduced structural reorganization and densification in the microstructure of geopolymer gels with high concentrations of soluble silicon in the activating solution has been proposed.
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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.