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Title |
Mechanical Properties and Reaction Products of Activated Slag System Depending on Gypsum Presence and Calcium Carbonate Addition
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Authors |
정연웅(Yeonung Jeong) ; 임귀환(Gwi Hwan Lim) ; 박수현(Su Hyeon Park) ; 김주형(Joo Hyung Kim) ; 김태상(Tae-Sang Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2020.24.4.55 |
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Keywords |
슬래그; 자극제; 반응생성물; 석고; 탄산칼슘 Slag; Activator; Reaction products; Gypsum; Calcium carbonate |
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Abstract |
This study investigates the mechanical properties and reaction products of activated slag pastes depending on gypsum presence and calciumcarbonate addition in terms of compressive strength tests and synchrotron X-ray diffraction. The chemicals of CaO and NaOH are used as activatorswith different two dosages. The reaction of CaO-activated slag without gypsum just accelerated by addition of calcium carbonate at early ages, butno improvement was observed at later ages. On the other hand, the mechanical properties of CaO-activated slag pastes with gypsum were improvedwith calcium carbonate, enhancing the stability of ettringite. The variation of mechanical properties of NaOH-activated slag pastes was negligibledepending on calcium carbonate addition in case of no gypsum. The addition of calcium carbonate into NaOH-activated slag pastes with gypsumdeteriorated its mechanical properties due to the ion competition between CO32- ions and SO32- ions, decreasing crystallinity of reaction products.
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