Effect of Salinity on Rheological Behavior of Cement-Treated Dredged Clays as Fills
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 9
Abstract
The rheological behavior of dredged clays at various pore water salinities treated with portland cement was investigated for beneficial use in structural fill applications. The focus was on evaluating the effect of salinity on flowability and viscosity of dredged clays as fills. Flow and viscosity tests were conducted on clay specimens at high water contents prepared using a sodium salt solution at various salinities and blended with cement in different proportions. Results suggest that the increase in salinity can reduce the liquid limit and viscosity while increasing the flowability. The slump flow value systematically increases with the increase in salinity. All specimens exhibited Bingham plastic behavior when the shear rate was greater than approximately . The two parameters of the Bingham plastic model including dynamic viscosity and yield stress consistently decrease with increasing salinity. Moreover, the two parameters were found to markedly decrease with salinity when salinity is less than 4% and less significantly when salinity exceeds 4%. The empirical power-law function between dynamic viscosity and liquid index cannot fully characterize the viscosity of cement-treated dredged clays at various salinities. Two power function curves can be fit to data of slump flow values corresponding to two parameters, indicating that the slump flow uniformly decreases with the increase in each parameter.
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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:
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Flow test data; and
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Viscosity test data.
Acknowledgments
The authors highly appreciate the financial support from the National Natural Science Foundation of China (Grant Nos. 51778556 and 51978315). The authors are thankful for the support of the Technology Project of the Ministry of Housing and Urban-Rural Development of China (No. 2018-K7-011) and the technology project of the Water Resources Department of Jiangsu Province, China (No. 2016004). The first author also appreciates the support from the Six-Talent-Peaks Project in Jiangsu Province, China (Grant No. 2015-JNHB-018).
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 9 • September 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Aug 27, 2019
Accepted: Mar 24, 2020
Published online: Jul 6, 2020
Published in print: Sep 1, 2020
Discussion open until: Dec 6, 2020
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