Laboratory Study of Phosphogypsum, Stabilizers, and Tropical Soil Mixtures
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 1
Abstract
Phosphogypsum (PG) is a by-product of the phosphoric acid fertilizer industries that has possible applications in paving when stabilized with cement or lime. This study’s aim is to compare the mechanical performance of the hemi-hydrate (HH) and dihydrate (DH) mixes with tropical soil, lime, and cement. The results of physical, mechanical, and mineralogical tests are presented, which demonstrate that the use of HH in cement and lime mixes reduces the swelling of this material compared to the use of DH; in addition, HH provides better mechanical behavior. These findings indicate that DH has limited application in pavement construction, but when converted into HH and mixed with tropical soil or chemical stabilizers, its alternative uses are possible, and more content (approximately 90%) of this material can be used.
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Acknowledgments
The authors are thankful for the funds provided by FAPEG and Anglo American to support this research, the partnering institutions for the use of their laboratories (University of Sao Paulo, University of Brasilia, Furnas and Regional Center for Technological Development and Innovation—CRTI/UFG) and the CNPq and CAPES for the grants.
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Journal of Materials in Civil Engineering
Volume 29 • Issue 1 • January 2017
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This work is made available under the terms of the Creative Commons Attribution 4.0 International license, http://creativecommons.org/licenses/by/4.0/.
History
Received: Oct 30, 2015
Accepted: Jun 9, 2016
Published online: Aug 10, 2016
Published in print: Jan 1, 2017
Discussion open until: Jan 10, 2017
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