Strategies for Developing More Sustainable Dosages for Soil–Coal Fly Ash–Lime Blends
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 11
Abstract
Sustainability is becoming a major concern for geotechnical engineering as this industry consumes considerable amounts of resources. Efforts have been made to reduce such impacts by incorporating industrial wastes in new materials and identifying materials that have a low burden on the environment. Nonetheless, there is still limited guidance on how to develop resource-efficient dosages for geotechnical materials. On the other hand, equations in which strength is formulated as a function of experimentally controlled variables (e.g., lime content or dry unit weight) have been devised for such materials. This means that distinct combinations of values can be assigned to these variables to attain a target strength. These equations allow the rate of gains in strength provided by each variable to be jointly assessed with the resources required to produce such gains. This manuscript proposes a method to rank such variables when jointly considering mechanical and environmental performances. This ranking allows a number of strategies to develop resource efficient dosages to be elicited. The proposed method is used to devise guidelines for a lime-treated soil. Results show that the main strategy is to increase dry unit weight rather than lime content as the former is more efficient when jointly considering gains in strength and resource consumption. The method presented herein is an initial effort towards the formulation of a comprehensive framework for optimizing the dosages of geotechnical materials, integrating environmental and mechanical considerations.
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Acknowledgments
The authors wish to express their gratitude to Brazilian MCT/CNPq for its financial support to the research group. A special thanks is due to Professor Luiz Fernando Carvalho da Rocha, Federal University of Rio Grande do Sul, for fruitful discussions at the conception of the research.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 11 • November 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Nov 19, 2015
Accepted: Mar 18, 2016
Published online: Jun 6, 2016
Published in print: Nov 1, 2016
Discussion open until: Nov 6, 2016
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