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Title |
Influence of Replacement Ratio and Fineness of GGBFS on Autogenous Shrinkage of Cement Mortars
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Authors |
송치원(Chiwon Song) ; 최성철(Seongcheol Choi) |
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DOI |
https://doi.org/10.4334/JKCI.2020.32.1.077 |
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Keywords |
고로슬래그 미분말; 분말도; 자기건조; 자기수축; 치환율 ground granulated blast-furnace slag (GGBFS); fineness; self-desiccation; autogenous shrinkage; replacement ratio |
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Abstract |
This study experimentally analyzed the effects of replacement ratio and fineness of ground granulated blast-furnace slag (GGBFS) on the autogenous shrinkage of cement mortar. The specimens were fabricated with GGBFS content (0, 50, 65 and 80 % by weight of binder) and fineness (4,330, 7,650 cm2/g) as variables, and the internal relative humidity and autogenous shrinkage were measured. The self-desiccation and autogenous shrinkage of the specimens with GGBFS replacement ratio up to 65 % increased as the content of the GGBFS increased whereas those decreased in the specimens with the GGBFS replacement ratio of 80 %. This is because GGBFS changed the pore structures and hydration of cementitious materials, resulting in the changes in the radius of meniscus formed inside the pores and eventually changes in the capillary stresses. In addition, the self-desiccation and autogenous shrinkage of cement mortar increased with increasing fineness of GGBFS.
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