Article

Abstract

• AbstractThe experimental and theoretical potential of using calcined waste eggshells (CWEs) to remove sulfate from sulfate-laden concrete mixing water was investigated in this work. Waste eggshells were first calcined at 800°C and batch-reacted with sodium sulfate solutions. Laboratory experiments elucidated the effect of initial sulfate concentration, temperature of reaction, and CWE particle size on total sulfate removal. Experimental results indicate a maximum sulfate removal of 29.5%±2.2% via calcium sulfate mineral precipitation in laboratory batch reactions. To quantify the maximum sulfate removal potential of CWEs, batch reactions were simulated using PHREEQC, a geochemical code. After validating the simulation approach with experimental data obtained herein, PHREEQC was used to investigate the maximum sulfate removed as a function of CWE addition (g/L). Results indicate that sulfate-laden waters (≤4,000  ppm) can be decreased to ≤3,000  ppm with CWE additions of ≥3  g/L in order to comply with the standard specification for maximum allowable sulfates in water intended for use in the production of hydraulic cement concrete.

Creator

• Craun, Zoey, M
• Gevaudan, Juan Pablo
• Srubar III, Wil V.

Additional Information

• "This material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers.

Academic Affiliation

• Civil, Environmental and Architectural Engineering

Journal Title

• Journal of Materials in Civil Engineering

Journal Issue/Number

• 6

Journal Volume

• 31

Last Modified

• 2021-07-01

Resource Type

• Preprint

Rights Statement

• In Copyright

DOI

•  https://doi.org/10.1061/(ASCE)MT.1943-5533.0002721

ISSN

• 1943-5533

Language

• English [eng]

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