Detail publikace

ULTRASONIC PULSE AND RESONANCE METHOD - EVALUATION OF THE DEGREE OF DAMAGE TO THE INTERNAL STRUCTURE OF REPAIR MORTARS CAUSED BY EXPOSURE TO HIGH TEMPERATURES

Originální název

ULTRASONIC PULSE AND RESONANCE METHOD - EVALUATION OF THE DEGREE OF DAMAGE TO THE INTERNAL STRUCTURE OF REPAIR MORTARS CAUSED BY EXPOSURE TO HIGH TEMPERATURES

Anglický název

ULTRASONIC PULSE AND RESONANCE METHOD - EVALUATION OF THE DEGREE OF DAMAGE TO THE INTERNAL STRUCTURE OF REPAIR MORTARS CAUSED BY EXPOSURE TO HIGH TEMPERATURES

Jazyk

en

Originální abstrakt

When the repair mortars for the repair of concrete structures are exposed to high temperatures, it results in irreversible changes in their internal structure. These changes can be evaluated both on the basis of the compressive strength and flexural strength, but their evaluation can also be made using dynamic non-destructive methods. The article presents the findings on the use of parameters from the measurement by ultrasonic pulse and resonance method. Changes in the internal structure of repair mortars were evaluated on the basis of the dynamic Young's modulus of elasticity and relative dynamic modulus of elasticity. The said parameters very well characterize the changes in the internal structure of the repair mortars, and their values decrease with the increasing temperature. Changes in the internal structure of the repair mortars also reduce the compressive strength and flexural strength. However, in some cases at a temperature of up to 200 °C the strength values are higher than the values obtained with the repair mortars before temperature load. This phenomenon can be explained by further binder hydration at moderately elevated temperature. The degree of correlation between the dynamic modulus of elasticity and the strengths is not the same. Higher closeness of correlation is between the values of dynamic modulus of elasticity and flexural strength. This can be explained by the fact that the results of the measurement obtained by dynamic non-destructive testing methods and flexural strength depend more on changes in the internal structure of the thermally loaded repair mortars than compressive strength. The researchers confirmed the suitability of the ultrasonic pulse and resonance method for evaluating the degree of damage to the internal structure of repair mortars exposed to high temperatures.

Anglický abstrakt

When the repair mortars for the repair of concrete structures are exposed to high temperatures, it results in irreversible changes in their internal structure. These changes can be evaluated both on the basis of the compressive strength and flexural strength, but their evaluation can also be made using dynamic non-destructive methods. The article presents the findings on the use of parameters from the measurement by ultrasonic pulse and resonance method. Changes in the internal structure of repair mortars were evaluated on the basis of the dynamic Young's modulus of elasticity and relative dynamic modulus of elasticity. The said parameters very well characterize the changes in the internal structure of the repair mortars, and their values decrease with the increasing temperature. Changes in the internal structure of the repair mortars also reduce the compressive strength and flexural strength. However, in some cases at a temperature of up to 200 °C the strength values are higher than the values obtained with the repair mortars before temperature load. This phenomenon can be explained by further binder hydration at moderately elevated temperature. The degree of correlation between the dynamic modulus of elasticity and the strengths is not the same. Higher closeness of correlation is between the values of dynamic modulus of elasticity and flexural strength. This can be explained by the fact that the results of the measurement obtained by dynamic non-destructive testing methods and flexural strength depend more on changes in the internal structure of the thermally loaded repair mortars than compressive strength. The researchers confirmed the suitability of the ultrasonic pulse and resonance method for evaluating the degree of damage to the internal structure of repair mortars exposed to high temperatures.

BibTex


@article{BUT143690,
  author="Jiří {Brožovský}",
  title="ULTRASONIC PULSE AND RESONANCE METHOD - EVALUATION OF THE DEGREE OF DAMAGE TO THE INTERNAL STRUCTURE OF REPAIR MORTARS CAUSED BY EXPOSURE TO HIGH TEMPERATURES",
  annote="When the repair mortars for the repair of concrete structures are exposed to high temperatures, it results in irreversible changes in their internal structure. These changes can be evaluated both on the basis of the compressive strength and flexural strength, but their evaluation can also be made using dynamic non-destructive methods. The article presents the findings on the use of parameters from the measurement by ultrasonic pulse and resonance method. Changes in the internal structure of repair mortars were evaluated on the basis of the dynamic Young's modulus of elasticity and relative dynamic modulus of elasticity. The said parameters very well characterize the changes in the internal structure of the repair mortars, and their values decrease with the increasing temperature. Changes in the internal structure of the repair mortars also reduce the compressive strength and flexural strength. However, in some cases at a temperature of up to 200 °C the strength values are higher than the values obtained with the repair mortars before temperature load. This phenomenon can be explained by further binder hydration at moderately elevated temperature. The degree of correlation between the dynamic modulus of elasticity and the strengths is not the same. Higher closeness of correlation is between the values of dynamic modulus of elasticity and flexural strength. This can be explained by the fact that the results of the measurement obtained by dynamic non-destructive testing methods and flexural strength depend more on changes in the internal structure of the thermally loaded repair mortars than compressive strength. The researchers confirmed the suitability of the ultrasonic pulse and resonance method for evaluating the degree of damage to the internal structure of repair mortars exposed to high temperatures.",
  address="MAIK NAUKA/INTERPERIODICA/SPRINGER, 233 SPRING ST, NEW YORK, NY 10013-1578 USA",
  chapter="143690",
  doi="10.1134/S1061830917100047",
  howpublished="print",
  institution="MAIK NAUKA/INTERPERIODICA/SPRINGER, 233 SPRING ST, NEW YORK, NY 10013-1578 USA",
  number="10",
  volume="53",
  year="2017",
  month="october",
  pages="744--753",
  publisher="MAIK NAUKA/INTERPERIODICA/SPRINGER, 233 SPRING ST, NEW YORK, NY 10013-1578 USA",
  type="journal article in Web of Science"
}