Journal ArticleDOI
Performance of alkali-activated slag mortars exposed to acids
TLDR
The acid resistance of 60-day cured alkali-activated slag (AAS) mortars, in comparison with Portland cement, is assessed in this paper, where specimens are exposed to hydrochloric, nitric and sulphuric acids at pH 3.0, and acetic acid (CH3COOH) at pH 4.5, with specimens also immersed in water as a control.Abstract:
The acid resistance of 60-day cured alkali-activated slag (AAS) mortars, in comparison with Portland cement, is assessed. Specimens are exposed to hydrochloric, nitric and sulphuric acids at pH 3.0, and acetic acid (CH3COOH) at pH 4.5, for 150 days, with specimens also immersed in water as a control. Negligible changes in compressive strength are identified in Portland cement and AAS binders during exposure to mineral acids, while compressive strength increases during immersion in water. However, exposure to CH3COOH reduces strength, and increases pore volume, in both Portland cement and AAS mortars. AAS performs better than Portland cement in CH3COOH, associated with the lower initial permeability of the specimens, along with the low CaO/SiO2 ratio typical of AAS. Decalcification of the AAS binder through formation of calcium acetate leaves an aluminosilicate type gel that can hinder the further ingress of acids, contributing to the high acid resistance of this binder.read more
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Journal ArticleDOI
Advances in understanding alkali-activated materials
TL;DR: Alkali activation is a highly active and rapidly developing field of activity in the global research and development community as discussed by the authors, and commercial-scale deployment of alkali-activated cements and concretes is now proceeding rapidly in multiple nations.
Journal ArticleDOI
Effect of slag content and activator dosage on the resistance of fly ash geopolymer binders to sulfuric acid attack
TL;DR: In this article, the effect of increasing slag content and activator dosage on the sulfuric acid resistance of fly ash geopolymer (GP) binders has been investigated and compared with Portland cement (PC) mix using various physical and microstructural techniques.
Journal ArticleDOI
A Review on the Durability of Alkali-Activated Fly Ash/Slag Systems: Advances, Issues, and Perspectives
TL;DR: In this article, the authors provide an overview of the latest developments on durability of fly ash/slag-based AAMs with the aim to update recent findings regarding their behavior under aggressive conditions (sulfates, freeze-thaw, chloride, carbonation, acid, efflorescence).
Journal ArticleDOI
The Durability of Alkali-Activated Materials in Comparison with Ordinary Portland Cements and Concretes: A Review
TL;DR: Wang et al. as discussed by the authors compared the durability of AAMs and OPC-based materials under sulfate attack, acid corrosion, carbonation, and chloride penetration, and concluded that AAM showed better durability performances than OPC in general.
Journal ArticleDOI
Effect of process parameters on the performance of fly ash/GGBS blended geopolymer composites
Hilal El-Hassan,Najif Ismail +1 more
TL;DR: Alkali activation of fly ash and ground-granulated blast-furnace slag (GGBS) is a sustainable technology that promotes recycling of industrial by-products in the form of geopolymer composites.
References
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Chemical Reaction Engineering
TL;DR: An overview of Chemical Reaction Engineering is presented, followed by an introduction to Reactor Design, and a discussion of the Dispersion Model.
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.
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TL;DR: The use of vibrational spectroscopy as a tool in identifying mineral species and in deriving information concerning the structure, composition and reactions of minerals and mineral products is discussed in this paper.
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TL;DR: The chemistry of cement and concrete as discussed by the authors, The chemistry of concrete and its properties, and the relationship between concrete and cement, is a classic example of such an approach. But it is not suitable for outdoor use.
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Lea's chemistry of cement and concrete
P. C. Hewlett,F. M. Lea +1 more
TL;DR: The history of calcareous cements and Portland cements can be found in this paper, where the structure and cementing qualities of cement compounds the constitution of Portland cement, the burning of Portland Cement, the hydration of PortlandCement, resistance of concrete to natural destructive agencies physical and mechanical properties of Portland cement pozzolanas and pozzolanic cements cements made from blast furnace slag high alumina cement some special cements, and cement properties cement admixtures concrete aggregates.