Study of interfacial transition zone in concrete with SCMs

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26232511%3A_____%2F22%3AN0000060" target="_blank" >RIV/26232511:_____/22:N0000060 - isvavai.cz</a>
Result on the web
<a href="https://iopscience.iop.org/article/10.1088/1742-6596/2341/1/012004/pdf" target="_blank" >https://iopscience.iop.org/article/10.1088/1742-6596/2341/1/012004/pdf</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1742-6596/2341/1/012004" target="_blank" >10.1088/1742-6596/2341/1/012004</a>

Result language
angličtina
Original language name
Study of interfacial transition zone in concrete with SCMs
Original language description
The interfacial transition zone is one of the weakest areas in concrete. Microcracks and new phases often form in this zone, affecting the resulting concrete's mechanical properties. In this research, concrete in which Portland cement was partially replaced by powdered limestone and/or metakaolin was cured for 1 and 28 days and then mechanical properties were tested. The interfacial transition zone was studied by scanning electron microscopy and selected phases were analyzed by electron microprobe. The addition of a small amount of limestone or metakaolin increases the strength of the concrete. The strength significantly decreases with a content of 10% or more supplementary cementitious materials (SCMs) in concrete. The microcrack's thickness at the binder-aggregate interface reaches up to 0.8 μm. In concretes with limestone, rhombohedral calcite crystals up to 0.5 μm in size accumulate in the interfacial zone. This accumulation can significantly reduce the strength of the concrete when the amount of limestone is high. Zeolites with a composition corresponding to Mg-mazzite are formed at the interface of cement paste, quartz and albite, partially replaced by sericite.
Czech name
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Czech description
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Type
J<sub>SC</sub> - Article in a specialist periodical, which is included in the SCOPUS database
CEP classification
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OECD FORD branch
20101 - Civil engineering

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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