Residual Compressive Behavior of Self-Compacting Concrete after High Temperature Exposure—Influence of Binder Materials

Scientific paper - Other

• Author: Marija Jelčić Rukavina
• Author: Ivan Gabrijel
• Author: Ivanka Netinger Grubeša
• Author: Ana Mladenovič
• Author's institution: Josip Juraj Strossmayer University of Osijek; Faculty of Civil Engineering and Architecture Osijek
• Author's institution: University of Zagreb; Faculty of Civil Engineering
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Civil Engineering

Abstract (english)

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 temperature

• Keywords (english): self-compacting concrete; mineral additives; high temperatures; residualmechanical properties
• Language: english
• Publication type: Scientific paper - Other
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Materials
• Numbering: vol. 15, no. 6, pp. 1-24
• p-ISSN: 1996-1944
• DOI: https://doi.org/10.3390/ma15062222
• URN:NBN: urn:nbn:hr:237:298846
• Publication: 2022-03-17
• Document URL: https://www.mdpi.com/1996-1944/15/6/2222
• Type of resource: Text
• Access conditions: Open access
• Created on: 2024-07-10 11:26:54