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http://dx.doi.org/10.14190/JRCR.2021.9.4.553

A Study on the Phase Change and Microstructure Change According to the Sintering Temperature of Cement Clinker Applied with Coal Ash  

Yoo, Dong-Woo (Department of Materials Science & Engieering, Kunsan National University)
Im, Young-Jin (Construction Materials R&D Corporation)
Choi, Sang-Min (Department of Materials Science & Engieering, Kunsan National University)
Lee, Chang-Hyun (Manufacturing Technology, Sampyo Cement)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.9, no.4, 2021 , pp. 553-560 More about this Journal
Abstract
In this study, cement clinker using a pure sample and clinker using 7% coal ash were sintered at a temperature of 1050~1500℃. Changes in the content of cement minerals and changes in microstructure by sintering temperature were reviewed. The application of coal ash as a raw material for cement clinker was applicable as a source of Al2O3 and SiO2. At a sintering temperature of 1350℃ or higher, the cement clinker applied with coal ash showed the same level of mineral content as compared to the cement clinker applied with pure raw material. The microstructure also showed a similar state, confirming that coal ash can be used as a raw material for cement. In XRD-Reitveld analysis, a maximum amount of Belite was produced at 1250℃. The conversion from Belite to Alite was observed from 1350℃. From 1350℃, the interstitial phase and the mineral phase presumed to be alite were distinguished. It was clearly distinguished from 1400℃. As the sintering temperature increased, the shape and boundary of the crystal phase became clear, and the size of the crystal phase was also increased.
Keywords
Cement clinker; Coal ash; Sintering; Phase change; Microstructure;
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Times Cited By KSCI : 1  (Citation Analysis)
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