Assessing concrete strength loss at elevated temperatures as a function of dielectric variation measured by GPR: an empirical study

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F22%3APU147278" target="_blank" >RIV/00216305:26110/22:PU147278 - isvavai.cz</a>

Alternative codes found

RIV/00216275:25510/22:39919748

Result on the web

<a href="https://www.tandfonline.com/doi/full/10.1080/10589759.2022.2140155?scroll=top&needAccess=true&role=tab" target="_blank" >https://www.tandfonline.com/doi/full/10.1080/10589759.2022.2140155?scroll=top&needAccess=true&role=tab</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1080/10589759.2022.2140155" target="_blank" >10.1080/10589759.2022.2140155</a>

Result language

angličtina

Original language name

Assessing concrete strength loss at elevated temperatures as a function of dielectric variation measured by GPR: an empirical study

Original language description

Reinforced concrete (RC) parts, which are exposed to high temperatures for a certain period, undergo physical-chemical changes that deteriorate their mechanical properties. To this end, this study investigates the efficiency of using ground-penetrating radar (GPR) as a non-destructive testing (NDT) method in assessing the core compressive strength loss, elastic modulus decrease, and tensile strength loss of concrete under extreme temperatures. RC specimens are fabricated and exposed to elevated temperatures (300 degrees C, 400 degrees C, 500 degrees C, 600 degrees C, and 700 degrees C). GPR measurements are performed to estimate the relative dielectric permittivity (RDP) of the specimens before fire exposure (BFE) and after fire exposure (AFE). The compressive strengths of the cores extracted from the specimens are obtained also for BFE and AFE cases. Attained RDP values are in conformance with the previous research results and contribute additional evidence to the published literature. As the temperature levels are increased, RDP and strength-related values of concrete specimens decrease. The strength-related parameters are more sensitive to elevated temperatures, whereas the change in the RDP values is rather gradual. Through multiple correlations within 95% confidence intervals, core compressive strength loss, elastic modulus decrease, and tensile strength loss are, individually, estimated as a function of relative RDP change and applied temperature levels. Empirical formulas are obtained with high coefficients of correlation. The relative effects of RDP change and temperature are more pronounced in elastic modulus decrease and tensile strength loss compared to compressive strength loss. Overall, the outcomes of this paper confirm the viability of using the GPR technique for concrete dielectric characterisation in estimating the strength-related properties of concrete exposed to high temperatures, which might reduce the need for destructive testing.

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

—

OECD FORD branch

20101 - Civil engineering

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

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

Name of the periodical

Nondestructive Testing and Evaluation

ISSN

1058-9759

e-ISSN

1477-2671

Volume of the periodical

37

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

26

Pages from-to

1-27

UT code for WoS article

000883279400001

EID of the result in the Scopus database

2-s2.0-85142208265