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Calcined Waste Eggshells Remove Sulfate in Non-Potable Concrete Mixing Water Public Deposited
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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.
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- "This material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers.
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- Journal Issue/Number
- 6
- Journal Volume
- 31
- Last Modified
- 2021-07-01
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- Rights Statement
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- ISSN
- 1943-5533
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Craun__Gevaudan__and_Srubar._2019.pdf | 2021-07-02 | Public | Download |