Study of interfacial transition zone in concrete with SCMs

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F22%3A00142075" target="_blank" >RIV/00216224:14310/22:00142075 - isvavai.cz</a>

Výsledek na webu

<a href="https://iopscience.iop.org/article/10.1088/1742-6596/2341/1/012004" target="_blank" >https://iopscience.iop.org/article/10.1088/1742-6596/2341/1/012004</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>

Jazyk výsledku

angličtina

Název v původním jazyce

Study of interfacial transition zone in concrete with SCMs

Popis výsledku v původním jazyce

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 mu m. In concretes with limestone, rhombohedral calcite crystals up to 0.5 mu m 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.

Název v anglickém jazyce

Study of interfacial transition zone in concrete with SCMs

Popis výsledku anglicky

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 mu m. In concretes with limestone, rhombohedral calcite crystals up to 0.5 mu m 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.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

25th International Conference Building Materials, Products and Technologies, ICBMPT 2022

ISBN

—

ISSN

1742-6588

e-ISSN

1742-6596

Počet stran výsledku

10

Strana od-do

1-10

Název nakladatele

IOP Publishing Ltd

Místo vydání

Bristol

Místo konání akce

Telc, CZECH REPUBLIC

Datum konání akce

1. 9. 2022

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

001293886900004