Setting Time Optimization of Excessive-Sulfate Phosphogypsum Slag Cement for Self-Compacting Concrete Based on a Paste Rheological Threshold Theory
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 9
Abstract
The accumulation of phosphogypsum (PG) has become a significant environmental and economic challenge, making PG reuse an urgent concern. This study aims to explore the potential of combining PG with steel slag (SS), ground granulated blast-furnace slag (GGBS), and cement clinker (CC) to create excessive-sulfate phosphogypsum slag cement (EPSC) for use in self-compacting concrete (SCC). However, residual acid and other impurities in PG can significantly slow down the setting time of EPSC. To optimize the setting time, different methods including wet grinding, washing, and the addition of pure gypsum, limestone powder (LP), and aluminum cement (AC) are used. Results show that the wet grinding method and washing method remove soluble phosphorus impurities and reduce fluorine ion levels by 64%. However, nonsoluble impurities that cannot be removed by wet grinding and washing continue to affect EPSC’s setting time. Furthermore, the addition of LP shortens the setting time, but not enough. Using a 3% dosage of AC successfully reduces the setting time to a satisfactory level and EPSC SCC with a 28-day strength greater than 40 MPa is produced using the paste rheological threshold method.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research was funded by the National Natural Science Foundation of China (52109153), the Fundamental Research Funds for the Central Universities (B230201060), the Jiangsu Planned Projects for Postdoctoral Research Funds (2021K055A), and the Doctor of Entrepreneurship and Innovation in Jiangsu Province (JSSCBS20210261).
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Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 9 • September 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Oct 6, 2023
Accepted: Mar 1, 2024
Published online: Jun 26, 2024
Published in print: Sep 1, 2024
Discussion open until: Nov 26, 2024
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