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Title |
Evaluation on Sulfate Resistance of the High-durablility Culvert using CAC and GGBS
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Authors |
이상아(Sang-ah Lee) ; 안기용(Ki-Yong Ann) |
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DOI |
https://doi.org/10.4334/JKCI.2018.30.5.465 |
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Keywords |
칼슘알루미네이트시멘트(CAC) ; 고로슬래그미분말(GGBS) ; 내구성 ; 하수암거 ; 황산염 저항성 Calcium Aluminate Cement (CAC) ; Granulated Ground Blast furnace Cement (GGBS) ; high-durability ; culvert ; sulfate resistance |
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Abstract |
The purpose of this study is to evaluate on sulfate resistance using Calcium aluminate cement(CAC) and Granulated Ground Blast-furnace cement(GGBS) for development of high-durability culvert. The C50G50 was mixed with 50% CAC and 50% GGBS, compressive strength and setting time were measured to determine the mechanical properties compared with ordinary Portland cement (OPC) and CAC. The results of two experiments showed that materials were superior in the order of C50G50>CAC> OPC; it was analyzed that C₂S, C₃S clinkers of GGBS produced C-S-H by hydration reaction and then filled voids having less porosity. The research carried out the weight change and length change to evaluate sulfate resistance; changes of hydration products and microstructure were detected by X-ray diffraction(XRD) and Scanning electron microscopy(SEM) analysis. The specimen was immersed in a 10% Magnesium sulfate(MgSO₄) and measured at 100 days curing. It was seen that C50G50 has no C₃A clinker and it forms less CH, and reacts with SO₄2- ion to form Ettringite resulted in the less change in the mass and length compared to OPC. Unlike C50G50, XRD analysis of specimens indicated that C-S-H and CH clinkers of OPC reacted with sulfate to form Ettringite and Gypsum, and showed similar changes of microstructure due to Ettringite.
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