The Effect of Concrete Quality on the Acoustic Emission Parameters during Three-Point Bending Fracture Test

Matysík, Michal; Topolář, Libor; Daněk, Petr; Vymazal, Tomáš; Plšková, Iveta

doi:10.4028/www.scientific.net/amr.897.149

Cited by 10 publications

(9 citation statements)

References 5 publications

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“…A very sensitive measuring microphone was used to capture the signal. Capturing of a signal, generation of a signal, synchronous time averaging, signal processing and perturbation signal amplitude level controlling was computer controlled [11,14].…”

Section: Nonlinear Resonant Ultrasound Spectroscopymentioning

confidence: 99%

Sensitivity Assessment of the Nonlinear Resonant Ultrasonic Spectroscopy for Concrete Damage Detection

Matysík

Plšková

Chobola

2020

KEM

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Nonlinear Resonant Ultrasound Spectroscopy is a nondestructive acoustic method which is able to measure the bulk hysteretic nonlinearity. This method monitors the shift of the resonant frequency in response of variations in the excitation frequency amplitudes. Measurements were performed on concrete samples exposed to temperatures of 200, 400, 600, 800, 1000, 1200 °C. The elastic modulus values are given to compare the Nonlinear Resonant Ultrasound Spectroscopy (NRUS) sensitivity. These are calculated from the measured velocities of ultrasonic pulses (linear acoustic method) and from the bulk density. The strengths of the samples obtained by destructive methods are also given. Based on these results, the NRUS method can be described as a very sensitive indicator of damage in concrete.

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Section: Nonlinear Resonant Ultrasound Spectroscopymentioning

confidence: 99%

Sensitivity Assessment of the Nonlinear Resonant Ultrasonic Spectroscopy for Concrete Damage Detection

Matysík

Plšková

Chobola

2020

KEM

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“…A number of papers have been published within the project, such as [30][31][32][33][34] . This paper describes one of the experiments conducted as part of the project.…”

Section: Experimental Part and Materialsmentioning

confidence: 99%

Experimental determination of the influence of fresh concrete’s composition on its resistance to water and de-icing chemicals by means of two methods

Kocáb¹,

Komárková²,

Králíková³

et al. 2017

Mater. Tehnol.

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Concrete's durability is currently a frequently discussed topic. The determination of concrete's durability is rather difficult since it depends on a number of factors, out of which the surface-layer quality is very important. One of the options for assessing its quality is the determination of concrete's resistance to water and de-icing chemicals. The testing is based on loading the concrete by cyclic freezing and thawing during the simultaneous action of a thawing solution. The damage to the surface layer manifests itself as scaling, i.e., the loss of small scales from the surface of the material. The resistance of concrete to water and de-icing chemicals can be determined by means of several methods; however, a universal method of evaluation has not yet been established in Europe. The goal of the experiment described here was to assess the influence of fresh concrete's composition on its resistance to water and de-icing chemicals using two different measurement methods (method A and C). A total of 9 fresh concrete mixtures were designed, from which specimens were made. The experiment was created and evaluated using the statistical method DOE (Design of Experiment). Based on the tests performed, it can be stated that a change in the content of cement and plasticiser in fresh concrete is visible in the results of both methods. However, more so in the results for method C, which is generally more sensitive to changes in fresh concrete's composition. Keywords: concrete, resistance, durability, de-icing chemicals Zdr`ljivost betona je pogosto obravnavana tema. Dolo~anje zdr`ljivosti betona je precej te`ko, ker je odvisno od {tevilnih faktorjev, med katerimi je pomembna tudi kvaliteta povr{inske plasti. Ena od opcij dolo~anja njene kvalitete, je dolo~anje odpornosti betona na vodo in na kemikalije proti zmrzovanju. Preizkus temelji na izpostavitvi betona cikli~nemu zamrzovanju in odtaljevanju s simultanim delovanjem raztopine za odtaljevanje. Po{kodbe povr{inskega sloja se ka`ejo kot lu{~enje povr{ine materiala. Odpornost betona na vodo in kemikalije za raztaljevanje se lahko dolo~i z ve~metodami; vendar pa univerzalna metoda za oceno tega v Evropi {e ni vzpostavljena. Cilj opisanih eksperimentov je bil oceniti vpliv sestavo sve`ega betona glede na njegovo odpornost na vodo in na kemikalije za raztaljevanje, z uporabo dveh metod (metoda A in C). Skupno je bilo pripravljenih 9 sve`ih betonskih me{anic iz katerih so bili izdelani vzorci. Eksperimenti so bili postavljeni in izvedeni z uporabo statisti~ne metode DOE (postavitev preizkusa). Na podlagi izvedenih preizkusov se lahko zaklju~i, da se spremembe v vsebnosti cementa in plastifikatorja v sve`em betonu poka`ejo pri obeh metodah. Vendar so bolj izrazite pri rezultatih metode C, ki je na splo{no bolj ob~utljiva na spremembe v sestavi sve`ega betona.

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“…Apart from destructive testing [6] elastic wave techniques have been countlessly used for characterization of concrete structures [7]. Mechanical properties of the material are closely connected to the velocity of an ultrasonic wave.…”

Section: Modulus Of Elasticitymentioning

confidence: 99%

Influence of Water Content on Fundamental Frequency of Mortar Sample

Carbol

Martínek

Kusák

2015

AMR

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Ultrasonic non-destructive testing methods such as Impact-echo are often conducted under different conditions. Such results might be distorted by ambient temperature or by water content of the tested sample. Tested mortar sample displayed shift of the fundamental frequency by 3.7 %. This article confirms necessity of standardized conditions during ultrasonic testing for both laboratory and in-situ testing.

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The Effect of Concrete Quality on the Acoustic Emission Parameters during Three-Point Bending Fracture Test

Cited by 10 publications

References 5 publications

Sensitivity Assessment of the Nonlinear Resonant Ultrasonic Spectroscopy for Concrete Damage Detection

Sensitivity Assessment of the Nonlinear Resonant Ultrasonic Spectroscopy for Concrete Damage Detection

Experimental determination of the influence of fresh concrete’s composition on its resistance to water and de-icing chemicals by means of two methods

Influence of Water Content on Fundamental Frequency of Mortar Sample

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