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Title |
The degree of hydration and mechanical properties of high volume fly ash cement
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Authors |
차수원(Soo-Won Cha) ; 최영철(Young-Cheol Choi) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.5.95 |
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Keywords |
압축강도; 하이볼륨 플라이애시; 수화도; 포졸란 활성; 비증발 수량 Compressive strength; High volume fly ash; Hydration degree; Non-evaporable water; Pozzolanic activity |
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Abstract |
Recently, there has been a growing interest in reducing greenhouse gases in all industrial fields. In the construction industry, studies have been conducted for the use of high-volume fly ash concrete to replace cement with fly ash. Quantitative measurements of cement hydration and fly ash reactivity enable a clear understanding of the strength development mechanism of high-volume fly ash concrete. It is very difficult to describe the reactivity in a simple way because the hydration and pozzolanic reactions of cement paste containing fly ash are very complex and the composition of the hydration product cannot be accurately determined. This study investigated the hydration and mechanical properties of high volume fly ash (HVFA) cement according to the substitution rate of fly ash (FA). The hydration degree of cement and the reactivity of FA were evaluated through the selective dissolution method and the non-evaporable water content of the paste according to age. In addition, compressive strength was measured using HVFA mortar specimens according to age. As a result of the experiment, as the substitution rate of fly ash increased, the hydration degree of cement increased, but the reactivity of FA decreased.
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