Experimental Investigation of the Compressive Strength of Normal-strength Air-entrained Concrete at High Temperatures

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F20%3A00338869" target="_blank" >RIV/68407700:21110/20:00338869 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.conbuildmat.2020.118662" target="_blank" >https://doi.org/10.1016/j.conbuildmat.2020.118662</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.conbuildmat.2020.118662" target="_blank" >10.1016/j.conbuildmat.2020.118662</a>

Result language

angličtina

Original language name

Experimental Investigation of the Compressive Strength of Normal-strength Air-entrained Concrete at High Temperatures

Original language description

Over the past decades, the mechanical properties of concrete during fire have been extensively investigated; however, not many studies were aimed at the properties of air-entrained concrete (AEC), and even fewer were aimed at the properties of AEC during fire, i.e. at high temperatures. The lack of studies is unfortunate as the higher porosity of concrete caused by the air entrainment (AE) could decrease the pore vapour pressure, which could in turn decrease the amount and intensity of micro-cracks and spalling of concrete, which is the main cause of concrete structure failures at high temperatures. This study investigates how the AE affects the heat-induced concrete spalling and the compressive strength of normal-strength concrete at temperatures ranging from 20 °C to 800 °C. When performing the experiments, heat treatments were first conducted on reference, i.e. non-air-entrained, and air-entrained specimens. Immediately after the heat treatments, compression tests were performed on the hot specimens in order to obtain the stress-strain diagrams and the compressive strengths of the investigated materials at high temperatures. The results obtained by the experiments suggest that the AE reduces the risk of massive concrete spalling when concrete is exposed to a high rate of temperature increase. The results also show that the AE reduces the compressive strength of concrete when the concrete is subjected to high temperatures for a long time period. This indicates that when using an air-entraining agent, a higher strength reduction should be assumed at high temperatures. It does, however, suggest that AE is very beneficial in the environments where a high rate of temperature increase can be expected.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20101 - Civil engineering

Project

<a href="/en/project/GA17-23067S" target="_blank" >GA17-23067S: Performance of concrete subjected to blast and subsequent fire loading</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2020

Confidentiality

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

Name of the periodical

Construction and Building Materials

ISSN

0950-0618

e-ISSN

1879-0526

Volume of the periodical

248

Issue of the periodical within the volume

06

Country of publishing house

GB - UNITED KINGDOM

Number of pages

10

Pages from-to

—

UT code for WoS article

000531081200049

EID of the result in the Scopus database

2-s2.0-85081133100