Contribution to the issue of evaluating the compressive strength of concrete exposed to high temperatures using the Schmidt rebound hammer

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F16%3APU115646" target="_blank" >RIV/00216305:26110/16:PU115646 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1134/S1061830916010046" target="_blank" >http://dx.doi.org/10.1134/S1061830916010046</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1134/S1061830916010046" target="_blank" >10.1134/S1061830916010046</a>

Result language

angličtina

Original language name

Contribution to the issue of evaluating the compressive strength of concrete exposed to high temperatures using the Schmidt rebound hammer

Original language description

Concrete properties change as a result of ambient conditions. The internal microstructure changes under high temperatures. As a consequence, this change affects both physical and mechanical properties of concrete and therefore the parameters determined from non-destructive testing. It was determined that for concrete exposed to temperatures in the range of 200 °C to 400 °C the rebound number measured by the rebound hammer is approximately 9 % higher after heat load than for wet concrete placed in a standard environment. Temperatures from 600 °C to 800 °C cause a drop in the rebound number, which correlates with a decrease in the concrete´s compressive strength. A strength dependency was established for the N-type Schmidt rebound hammer expressing the relationship between the rebound number and the compressive strength of concrete exposed to heat load, which is characterized by a high correlation between variables (correlation coefficient is 0.98). To estimate the compressive strength of concrete in a structure which has been exposed by fire, can be used both the calculated strength relationship, both the calibration curves for N-type Schmidt rebound hammer calculated by manufacturer, eventually the basic curve from CSN EN 13791. If the calibration equation for N-type Schmidt rebound hammer or basic curve of CSN EN 13791 is taken, the calculated strength for the rebound numbers should be lowered using the corrective coefficient, the value of which is 0.54, respectively 0.65.

Czech name

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Czech description

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Type

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

CEP classification

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OECD FORD branch

20101 - Civil engineering

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2016

Confidentiality

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

Name of the periodical

RUSSIAN JOURNAL OF NONDESTRUCTIVE TESTING

ISSN

1061-8309

e-ISSN

1608-3385

Volume of the periodical

52

Issue of the periodical within the volume

1

Country of publishing house

RU - RUSSIAN FEDERATION

Number of pages

9

Pages from-to

44-52

UT code for WoS article

000376116100006

EID of the result in the Scopus database

2-s2.0-84969850431