Properties of concrete intended for further testing measured by the Impact-Echo and the ultrasonic pulse method
Abstract
The aim of the paper is non-destructive measurement of differently degraded
specimens by high temperature intended for further testing of joints of stainless steel helical
reinforcement glued into the groove and differently degraded concrete. Measurement intended
for determination of possibilities of estimation of future properties of named joints is
performed by the Impact-Echo method and by the ultrasonic pulse velocity method on
specimens of dimensions 400 × 100 × 100 mm made of concrete of the C20/25 strength class
degraded by different elevated temperature. Five sets of specimens were manufactured - four
sets of specimens were heated in the furnace at temperatures of 400 °C, 600 °C, 800 °C and
1000 °C and one set was kept intact as reference. Specimens will be afterwards additionally
strengthened at the tensile side of specimens and broken by four-point flexural strength test.
The non-destructive measurement aims to evaluate the residual physical-mechanical properties
of plain concrete in terms of resonance frequency of test specimen, and sound velocity in tested
specimen before and after the temperature degradation. This assessment will serve as material
information basis for interpretation of the expected behaviour of used helical reinforcement for
a retrofitting process and the thermally damaged concrete reaction to such intervention.
Keywords
Concrete, High temperature, Impact-Echo, Ultrasonic pulse methodPersistent identifier
http://hdl.handle.net/11012/137129Document type
Peer reviewedDocument version
Final PDFSource
IOP Conference Series: Materials Science and Engineering. 2018, vol. 385, issue 1, p. 1-6.http://iopscience.iop.org/article/10.1088/1757-899X/385/1/012025
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