State-of-the-Art Review on the Role of Fly Ashes in Geotechnical and Geoenvironmental Applications
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 8
Abstract
Thermal power stations in most countries are burdened with the problem of fly ash disposal, and unless suitable uses are found for fly ash, it will pose a gigantic problem for the power sector. The disposal of huge quantities of fly ash without proper care significantly impacts the environment, particularly by creating soil and groundwater contamination. However, it is essential to note that fly ashes have many desirable properties that can find application in civil engineering in general and in geotechnical engineering in particular. This article reviews the literature dealing with the generation of fly ashes and briefly describes their desirable properties with respect to geotechnical and geoenvironmental applications. Desirable properties include pozzolanic reactivity along with mineralogical and morphological physiognomies that enhance surface adsorption of toxic heavy-metal ions. These properties are delineated further in this review article. The stabilizer effect on the geotechnical behavior of fly ashes is addressed with emphasis on morphological and mineralogical aspects. One of the limiting factors of stabilization, lime leachability and its effect on durability and long-term performance, is discussed. Various environmental concerns associated with the use of fly ashes are also addressed.
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Acknowledgments
The author acknowledges that this research was financially supported by King Saud University, Vice Deanship of Research Chairs. The author is grateful to Dr. Baig MYA, Retired Professor, SVUCE, Tirupati, India, for his kind assistance in preparing the manuscript. The author thanks the reviewers for their constructive comments, which helped the cause of the manuscript.
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Journal of Materials in Civil Engineering
Volume 29 • Issue 8 • August 2017
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©2017 American Society of Civil Engineers.
History
Received: Apr 20, 2016
Accepted: Nov 23, 2016
Published ahead of print: Apr 6, 2017
Published online: Apr 7, 2017
Published in print: Aug 1, 2017
Discussion open until: Sep 7, 2017
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