Effect of Elevated Temperature on the Bond Strength of Prestressing Reinforcement in UHPC
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21610%2F20%3A00345929" target="_blank" >RIV/68407700:21610/20:00345929 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.3390/ma13214990" target="_blank" >https://doi.org/10.3390/ma13214990</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3390/ma13214990" target="_blank" >10.3390/ma13214990</a>
Alternative languages
Result language
angličtina
Original language name
Effect of Elevated Temperature on the Bond Strength of Prestressing Reinforcement in UHPC
Original language description
The study explores the effect of elevated temperatures on the bond strength between prestressing reinforcement and ultra-high performance concrete (UHPC). Laboratory investigations reveal that the changes in bond strength correspond well with the changes in compressive strength of UHPC and their correlation can be mathematically described. Exposition of specimens to temperatures up to 200 °C does not reduce bond strength as a negative effect of increasing temperature is outweighed by the positive effect of thermal increase on the reactivity of silica fume in UHPC mixture. Above 200 °C, bond strength significantly reduces; for instance, a decrease by about 70% is observed at 800 °C. The decreases in compressive and bond strengths for temperatures above 400 °C are related to the changes of phase composition of UHPC matrix (as revealed by X-ray powder diffraction) and the changes in microstructure including the increase of porosity (verified by mercury intrusion porosimetry and observation of confocal microscopy) and development cracks detected by scanning electron microscopy. Future research should investigate the effect of relaxation of prestressing reinforcement with increasing temperature on bond strength reduction by numerical modelling
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20102 - Construction engineering, Municipal and structural engineering
Result continuities
Project
<a href="/en/project/GA17-22796S" target="_blank" >GA17-22796S: Experimental and numerical analysis of bond behaviour between steel reinforcement and Ultra High Performance Concrete (UHPC) at elevated temperatures</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Materials
ISSN
1996-1944
e-ISSN
1996-1944
Volume of the periodical
13
Issue of the periodical within the volume
21
Country of publishing house
CH - SWITZERLAND
Number of pages
21
Pages from-to
1-21
UT code for WoS article
000589292900001
EID of the result in the Scopus database
2-s2.0-85095788441