Marija Jelčić Rukavina (Author), Ivan Gabrijel (Author), Ivanka Netinger Grubeša (Author), Ana Mladenovič (Author)

Abstract

This paper presents an experimental investigation of the compressive behavior of highstrength self-compacting concrete exposed to temperatures up to 600 C. Ten different concrete compositions were tested, in which part of the cement (by weight) was replaced by three different mineral additives (5–15% metakaolin, 20–40% fly ash and 5–15% limestone). The stress–strain curves, compressive strength, modulus of elasticity and strain at peak stress were evaluated from uniaxial compression tests. Scanning electron microscope micrographs were also taken to evaluate the damage caused by the high temperatures. A sharp decrease in mechanical properties and an increase in peak strain were observed already after 200 C for all mixes tested. The different mineral additives used in this study affected the variations of residual compressive strength by 24% and peak strain by 38%, while the variations of residual modulus elasticity were 14%. Comparing the obtained results with the recommendations for compressive strength given in regulatory code EN 1992-1-2 for high strength concrete, it can be concluded that the strength loss observed in EN 1992-1-2 at temperatures up to 400 C is too conservative. The Popovics model for the relationship between stress and strain provided a good approximation for the experimentally determined stress–strain curves at different temperatures.

Keywords

samorazlivni beton;mineralni dodatki;visoke temperature;zaostale mehanske lastnosti;self-compacting concrete;mineral additives;high temperatures;residual mechanical properties;open access;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: ZAG - Slovenian National Building and Civil Engineering Institute
Publisher: Molecular Diversity Preservation International
UDC: 620.1/2
COBISS: 101518595 Link will open in a new window
ISSN: 1996-1944
Views: 4
Downloads: 1
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Other data

Secondary language: Slovenian
Secondary keywords: samorazlivni beton;mineralni dodatki;visoke temperature;zaostale mehanske lastnosti;
Source comment: Nasl. z nasl. zaslona; Opis vira z dne 18. 3. 2022; Št. članka 2222;
Pages: str. 1-24
Volume: ǂVol. ǂ15
Issue: ǂiss. ǂ6
Chronology: 2022
DOI: 10.3390/ma15062222
ID: 18739485