Exploring Structural Evolution of Portland Cement Blended with Supplementary Cementitious Materials in Seawater
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Title
- Exploring Structural Evolution of Portland Cement Blended with Supplementary Cementitious Materials in Seawater
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Author(s)
- Park, Solmoi; Park, Jun Kil; Lee, Namkon; Kim, Min Ook
- KIOST Author(s)
- Park, Jun Kil(박준길)
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Alternative Author(s)
- 박준길
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Publication Year
- 2021-03
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Abstract
- The present study investigated the structural evolution of Portland cement (PC) incorporating supplementary cementitious materials (SCMs) exposed to seawater. The samples were made with replacing Portland cement with 10 mass-% silica fume, metakaolin or glass powder. The reaction degree of SCMs estimated by the portlandite consumption shows that metakaolin has the highest reaction degree, thus metakaolin-blended PC exhibits the highest strength. The control exposed to seawater exhibited 14.82% and 12.14% higher compressive strengths compared to those cured in tap water at 7 and 28 days. The samples incorporating metakaolin showed the highest compressive strength of 76.60 MPa at 90 days tap water curing and this was 17% higher than that of the control. Exposure to seawater is found to retard the rate of hydration in all SCM-incorporating systems, while the strength development of the neat PC system is enhanced. The main reaction product that forms during exposure to seawater is Cl-AFm and brucite, while it is predicted by the thermodynamic modelling that a significant amount of M-S-H, calcite and hydrotalcite is to form at an extended period of exposure time.
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ISSN
- 1996-1944
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/40173
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DOI
- 10.3390/ma14051210
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Bibliographic Citation
- MATERIALS, v.14, no.5, pp.1 - 15, 2021
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Publisher
- MDPI
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Subject
- Calcite; Compressive strength; Curing; Hydrated lime; Portland cement; Silica fume; Exposure-time; Glass Powder; Hydrotalcites; Reaction degree; Strength development; Structural evolution; Supplementary cementitious material; Thermodynamic modelling; Seawater
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Keywords
- Portland cement; supplementary cementitious materials; seawater; phase evolution
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Type
- Article
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Language
- English
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Document Type
- Article
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