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Materials 2019, 12(8), 1198; https://doi.org/10.3390/ma12081198

A Review of Durability and Strength Characteristics of Alkali-Activated Slag Concrete

College of Engineering, Abu Dhabi University, P.O. Box 59911, Abu Dhabi, UAE
Received: 8 March 2019 / Revised: 7 April 2019 / Accepted: 8 April 2019 / Published: 12 April 2019
(This article belongs to the Special Issue New Advances in Self-Compacting Concrete and Geopolymer Concrete)
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Abstract

Alkali-activated slag (AAS) is a promising alternative to ordinary Portland cement (OPC) as sole binder for reinforced concrete structures. OPC is reportedly responsible for over 5% of the global CO2 emission. In addition, slag is an industrial by-product that must be land-filled if not re-used. Therefore, it has been studied by many investigators as environmentally friendly replacement of OPC. In addition to recycling, AAS offers favorable properties to concrete such as rapid development of compressive strength and high resistance to sulfate attack. Some of the potential shortcomings of AAS include high shrinkage, short setting time, and high rate of carbonation. Using ground granulated blast furnace slag (GGBS) as an alternative to OPC requires its activation with high alkalinity compounds such as sodium hydroxide (NaOH), sodium sulfate (Na2SO3), sodium carbonate (Na2CO3), or combination of these compounds such as NaOH and Na2SO3. The mechanism of alkali-activation is still not fully understood and further research is required. This paper overviews the properties, advantages, and potential shortcomings of AAS concrete. View Full-Text
Keywords: alkali activated slag; carbonation; shrinkage; alkaline activator; hydration products; alkali-silica reaction; curing temperature; fly ash; silica fume alkali activated slag; carbonation; shrinkage; alkaline activator; hydration products; alkali-silica reaction; curing temperature; fly ash; silica fume
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Mohamed, O.A. A Review of Durability and Strength Characteristics of Alkali-Activated Slag Concrete. Materials 2019, 12, 1198.

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