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http://dx.doi.org/10.5345/JKIBC.2022.22.5.431

Hydration Characteristics of Liquid Red Mud Mixed Cement Paste Neutralized with Sulfuric Acid  

Kang, Suk-Pyo (Department of Construction Engineering, Woosuk University)
Hong, Seong-Uk (Department of Construction Engineering, Woosuk University)
Kim, Sang-Jin (Department of Construction Engineering, Woosuk University)
In, Byung-Eun (Department of Construction Engineering, Woosuk University)
Publication Information
Journal of the Korea Institute of Building Construction / v.22, no.5, 2022 , pp. 431-439 More about this Journal
Abstract
In this study, Neutralized red mud(LRM+S) at a pH of 6-8 was prepared by adding sulfuric acid to liquefied red mud(LRM) at a pH of 10~12. After adding LRM and LRM+S to the cement paste, the hydration heat, compressive strength, and hydration products were examined. The observed accumulated hydration heat revealed that the calorific value of the cement paste with LRM was low and its and peak was delayed when compared with that of plain cement paste(referred to as Plain), whereas the calorific value of the cement paste with LRM+S was similar to that of Plain. At the age of 28 days, the compressive strength of the cement paste with 20% LRM was 55% of the strength of Plain. Using X-ray diffraction, it was determined that the cement paste with 20% LRM exhibited a Ca(OH)2 peak after 3 days, whereas the cement paste with 20% LRM+S and Plain exhibited a Ca(OH)2 peak after an hour. Thus, the strength degradation of cementitious materials was improved by adding neutralized red mud prepared by adjusting the pH of highly alkaline LRM with sulfuric acid.
Keywords
red mud; liquefied red mud; sulfuric acid red mud; cement paste; hydration heat; compressive strength; X-ray diffraction; recycling;
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