Journal Article10.1016/J.CEMCONRES.2005.03.003
Composition and Microstructure of Alkali Activated Fly Ash Binder: Effect of the Activator
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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.
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About: This article is published in Cement and Concrete Research. The article was published on 01 Oct 2005. The article focuses on the topics: Fly ash & Aluminosilicate.
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Citations
Optimization of metakaolin-based Geopolymer Composite using Sisal Fibers, response Surface Methodology, and Canonical Analysis
Lorayne Cristina Silva,Rondinele Alberto dos Reis Ferreira,Leila Aparecida de Castro Motta,Lucas Bellini Machado +3 more
TL;DR: In this paper, reinforced geopolymer pastes with elongated sisal fibers by means of parameters such as flexural strength were studied, and the best value for the modulus of rupture was of approximately 9.3 MPa, obtained with 2 days curing, with the activator/metakaolin ratio of 0.59 and percentage of sisal fiber de 4.34.
The sequel of modified fly ashes using high energy ball milling on mechanical performance of substituted past cement
TL;DR: In this article, a planetary ball mill was used to obtain modified fly ashes powders that were used as substitutes in a cement paste, and the results indicated that the substitution results in levels of compressive strength as large as 70MPa for particular combination of milling time, fly ash content and curing time.
Geopolymer Synthesized Using Circulating Fluidized Bed Fly Ash with Varying Levels of Calcium Content: Performance Evaluation and Microstructural Changes
J.J. Li,Zhibin Ma,Yanxia Guo +2 more
- 01 Jan 2023
TL;DR: Geopolymer synthesized using CFBFA with varying calcium content exhibits poor workability and generates a more crystal phase structure, hindering densification and mechanical property development. The evolution of Si-Al coordination structure differs between LCFA- and HCFA-based geopolymer.
Modification of glass powder and its effect on the compressive strength of hardened alkali-activated slag-glass powder paste
TL;DR: In this paper , the compressive strength of ground granulated blast furnace slag-glass powder (GGBS-GP) paste was improved by replacing GP with pretreated glass powder (PGP).
Properties of Steel Fiber-Reinforced Alkali-Activated Slag Concrete Made with Recycled Concrete Aggregates and Dune Sand
TL;DR: In this article, the performance of concrete made with RCA and reinforced with steel fibers was examined and the results showed that the compressive strength did not decrease in plain concrete mixes with 30 and 70% RCA replacement.
References
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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Synthesis and characterisation of materials based on inorganic polymers of alumina and silica: sodium polysialate polymers
TL;DR: In this article, a statistical study of the effect on the polymerization process of the molar ratio of the component oxides and the water content of the mixture showed the latter to be a critical parameter.
1K
Synthesis of zeolites from coal fly ash: an overview
Xavier Querol,Natalia Moreno,J.C Umaña,Andrés Alastuey,E. Hernández,Angel Lopez-Soler,F. Plana +6 more
TL;DR: An overview on the methodologies for zeolite synthesis from CFA, and a detailed description of conventional alkaline conversion processes, with special emphasis on the experimental conditions to obtain high cation exchange capacity (CEC) zeolites is given in this article.
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Microstructure Development of Alkali-Activated Fly Ash Cement: A Descriptive Model
TL;DR: In this paper, the microscopic study of a set of alkali-activated and thermally cured fly ash samples enabled the authors to establish a descriptive model for the microstructural development of fly ash-based cementitious geopolymers.
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Characterisation of fly ashes. Potential reactivity as alkaline cements
TL;DR: In this article, a representative group of Spanish fly ashes has been characterised in order to determine its capacity for being alkali activated and give place to a material with cementitious properties.
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