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CARBOL, L. MATYSÍK, M. CHOBOLA, Z. DVOŘÁK, R.
Original Title
Monitoring of Thermally Damaged Concrete by Various Ultrasonic Methods
Type
abstract
Language
English
Original Abstract
The performance of concrete under elevated temperatures is very complicated and difficult to characterize. With increasing temperature there is a decrease (or change) of mechanical and physical properties such as compressive strength, tensile strength, modulus of elasticity, density, etc. In this paper we examine the interaction of thermal damage processes in concrete and parameters obtained by different nondestructive ultrasonic methods. We were focused on conventional and innovative ultrasonic methods. The conventional technique was Ultrasonic Pulse Velocity (UPV) method. The pulse velocity in a material depends on its density and its elastic properties which in turn are related to the quality and the compressive strength of the concrete. The innovative ultrasonic method is based on principles of Nonlinear Elastic Wave Spectroscopy. Material nonlinearities manifest themselves as resonant frequency shifts and harmonics or dumping coefficients changes. The procedure described and tested in this article uses broadband pulse-compression signal, with variable amplitude to measure the change of fundamental frequency.
Keywords
Thermally Damaged Concrete, Nonlinear Elastic Wave Spectroscopy (NEWS), Maximum Length Sequence (MLS), Ultrasonic Pulse Velocity (UPV),
Authors
CARBOL, L.; MATYSÍK, M.; CHOBOLA, Z.; DVOŘÁK, R.
Released
28. 9. 2016
Publisher
Inštitut za kovinske materiale in tehnologije
Location
Ljubljana
ISBN
978-961-94088-0-3
Book
24th INTERNATIONAL CONFERENCE ON MATERIALS AND TECHNOLOGY
Edition
1
Edition number
Pages from
52
Pages to
Pages count
BibTex
@misc{BUT128750, author="Ladislav {Carbol} and Michal {Matysík} and Zdeněk {Chobola} and Richard {Dvořák}", title="Monitoring of Thermally Damaged Concrete by Various Ultrasonic Methods", booktitle="24th INTERNATIONAL CONFERENCE ON MATERIALS AND TECHNOLOGY", year="2016", series="1", edition="1", pages="52--52", publisher="Inštitut za kovinske materiale in tehnologije", address="Ljubljana", isbn="978-961-94088-0-3", note="abstract" }