Publication detail

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

BROŽOVSKÝ, J. BODNÁROVÁ, L.

Original Title

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

English Title

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

Type

journal article in Web of Science

Language

en

Original Abstract

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.

English abstract

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.

Keywords

concrete, rebound hammer, strength, rebound number, nanoparticles, carbon nanotubes, high temperature

Released

31.01.2016

Publisher

Springer

Location

Rusko

ISBN

1061-8309

Periodical

RUSSIAN JOURNAL OF NONDESTRUCTIVE TESTING

Year of study

52

Number

1

State

RU

Pages from

44

Pages to

52

Pages count

9

Documents

BibTex


@article{BUT117248,
  author="Jiří {Brožovský} and Lenka {Bodnárová}",
  title="Contribution to the issue of evaluating the compressive strength of concrete exposed to high temperatures using the Schmidt rebound hammer",
  annote="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.",
  address="Springer",
  chapter="117248",
  doi="10.1134/S1061830916010046",
  howpublished="print",
  institution="Springer",
  number="1",
  volume="52",
  year="2016",
  month="january",
  pages="44--52",
  publisher="Springer",
  type="journal article in Web of Science"
}