Exploring Structural Evolution of Portland Cement Blended with Supplementary Cementitious Materials in Seawater SCIE SCOPUS

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Title
Exploring Structural Evolution of Portland Cement Blended with Supplementary Cementitious Materials in Seawater
Author(s)
Park, Solmoi; Park, Jun Kil; Lee, Namkon; Kim, Min Ook
KIOST Author(s)
Park, Jun Kil(박준길)
Alternative Author(s)
박준길
Publication Year
2021-03
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.
ISSN
1996-1944
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/40173
DOI
10.3390/ma14051210
Bibliographic Citation
MATERIALS, v.14, no.5, pp.1 - 15, 2021
Publisher
MDPI
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
Keywords
Portland cement; supplementary cementitious materials; seawater; phase evolution
Type
Article
Language
English
Document Type
Article
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