Low-Energy Consumption Preparation of Fine Waterproof Cementitious Material with High-Volume Phosphogypsum
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 11
Abstract
Phosphogypsum (PG) is an industrial solid waste which is difficult to dispose of and can cause environmental pollution. This paper investigated a low-energy-consumption preparation from PG of an environmentally friendly building material. PG was converted to hemihydrate gypsum () using the nonautoclaved method. Then the from PG (PGHH) was mixed with different dosages of fly ash and/or cement to obtain PGHH–fly ash–cement (PFC) cementitious materials, enhancing the water resistance of the corresponding hardened material. Results showed that the optimal mix proportion (by weight) of PGHH:fly ash:cement was when the water resistance and mechanical strength properties of the corresponding hardened materials were comprehensively compared. With this proportion, the 3-, 28-, and 90-day softening coefficients were more than 25%, 50%, and 70% higher than those of the control group (PGHH alone). It was demonstrated that the from hydration of cement can activate the pozzolanic reaction of fly ash, thus forming ettringite and C─ S─ H gel and making the hardened materials denser and more waterproof. The prepared PFC cementitious material has application as a building material which can provide a low-energy-consumption and environmentally friendly method for utilizing PG.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work is financially supported by the Major State Research Development Program of China (No. 2016YFC0700904). We are grateful to Professor Yubin Sun and Xinya Yang, Centre for Material Research and Analysis of Wuhan University of Technology, for their help with testing methods.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 11 • November 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Jul 24, 2019
Accepted: Apr 29, 2020
Published online: Aug 22, 2020
Published in print: Nov 1, 2020
Discussion open until: Jan 22, 2021
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