Author
Erez N. Allouche
Other affiliations: University of Alberta, Louisiana Tech University, University of Western Ontario ...read more
Bio: Erez N. Allouche is an academic researcher from Stantec. The author has contributed to research in topics: Geopolymer & Fly ash. The author has an hindex of 26, co-authored 104 publications receiving 2550 citations. Previous affiliations of Erez N. Allouche include University of Alberta & Louisiana Tech University.
Papers published on a yearly basis
Papers
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TL;DR: In this paper, the suitability of fly ash stock piles for geopolymer manufacturing was studied and the results of chemical analyses, X-ray diffraction (XRD) and particle size distribution (PSD) of five sources of coal-fired power generating plants in the US are presented.
410 citations
TL;DR: In this article, the properties of fly-ash-based geopolymer concrete (GPC) were studied using regression analysis to identify tendencies and correlations within the mechanical properties of GPC.
Abstract: The mechanical properties of fly-ash-based geopolymer concrete (GPC) were studied. Experimentally measured values of the static elastic modulus, Poisson’s ratio, compressive strength, and flexural strength of GPC specimens made from 25 fly ash (FA) stockpiles from different sources were recorded and analyzed. The results were studied using regression analysis to identify tendencies and correlations within the mechanical properties of GPC. It was found that the mechanical behavior of GPC is similar to that of ordinary portland cement (OPC) concrete, suggesting that equations, akin to those given by ACI 318-08, could be applied for GPC to determine its flexural strength and static elastic modulus. The validity of an equation to determine the density of GPC as a function of FA fineness was also put forward.
287 citations
TL;DR: In this paper, reinforced geopolymer concretes with fly ashes having reduced calcium content are more suitable for the production of durable concrete for structural applications under exposure to carbonating environments, as the properties of these materials seem to mitigate the risk of carbonationinduced reinforcement corrosion in concrete.
137 citations
TL;DR: In this article, an experimental investigation for alkali silica reaction (ASR) between reactive aggregates and the geopolymer matrix was conducted using one Class C and two Class F fly ash stockpiles.
Abstract: This study reports the findings of an experimental investigation for alkali silica reaction (ASR) between reactive aggregates and the geopolymer matrix. Specimens were prepared using one Class C and two Class F fly ash stockpiles. Mechanical testing included potential reactivity of the aggregates via length change and compression test measurements, as per ASTM standards. Results suggest that the extent of ASR reaction due to the presence of reactive aggregates in fly ash-based geopolymer concretes is substantially lower than in the case of ordinary portland cement-based concrete, and well below the ASTM specified threshold. Furthermore, geopolymer concrete specimens appeared to undergo a densification process in the presence of alkali solutions, resulting in reduced permeability and increased mechanical strength. Utilizing ASR-vulnerable aggregates in the production of geopolymer concrete products could contribute to the economic appeal and sustainability of geopolymer binders in regions that suffer from insufficient local supply of high quality aggregates.
134 citations
TL;DR: In this article, the authors introduce the concept of ''social indicators'' as a means to link adverse impacts generated by construction activities and valuation methods and propose a generic framework for the development of such an approach.
131 citations
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TL;DR: In this paper, a brief discussion of the class of cementing materials known as "alkali-activated binders" is provided, which are identified to have potential for utilization as a key component of a sustainable future global construction materials industry.
1,052 citations
TL;DR: An overview of advances in geopolymers formed by the alkaline activation of aluminosilicates is presented along with opportunities for their use in building construction as mentioned in this paper, with respect to fresh and hardened states, interfacial transition zone between aggregate and geopolymer, bond with steel reinforcing bars and resistance to elevated temperature.
899 citations
TL;DR: In this paper, the potential applications for coal fly ash as a raw material were reviewed. And the authors found that there is significant potential for the increased utilisation of coal fly-ash both in its raw and refined state.
879 citations
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.
873 citations
TL;DR: In this paper, the synthesis of alkali-activated binders from blast furnace slag, calcined clay (metakaolin), and fly ash is discussed, including analysis of the chemical reaction mechanisms and binder phase assemblages that control the early-age and hardened properties of these materials.
Abstract: The development of new, sustainable, low-CO2 construction materials is essential if the global construction industry is to reduce the environmental footprint of its activities, which is incurred particularly through the production of Portland cement. One type of non-Portland cement that is attracting particular attention is based on alkali-aluminosilicate chemistry, including the class of binders that have become known as geopolymers. These materials offer technical properties comparable to those of Portland cement, but with a much lower CO2 footprint and with the potential for performance advantages over traditional cements in certain niche applications. This review discusses the synthesis of alkali-activated binders from blast furnace slag, calcined clay (metakaolin), and fly ash, including analysis of the chemical reaction mechanisms and binder phase assemblages that control the early-age and hardened properties of these materials, in particular initial setting and long-term durability. Perspectives fo...
862 citations