Application acoustic emission method during concrete frost resistance

Pazdera, Lubos; Topolář, Libor

doi:10.1134/s1061830914020065

Cited by 25 publications

(20 citation statements)

References 2 publications

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“…Presently many researches raise multi means to enhance the precision of concrete nondestructive testing [4][5][6][7][8][9][10]. UCM is a widely recognized method now in engineering [11] and it improves rebound method and ultrasonic method to some extent.…”

Section: Introductionmentioning

confidence: 99%

A Study on Testing Concrete Strength by Inversely Regressed Synthesis Ultrasonic-rebound Method

Cai¹,

Cen²,

Li³

et al. 2017

Proceedings of the 2017 6th International Conference on Measurement, Instrumentation and Automation (ICMIA 2017)

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Section: Introductionmentioning

confidence: 99%

A Study on Testing Concrete Strength by Inversely Regressed Synthesis Ultrasonic-rebound Method

Cai¹,

Cen²,

Li³

et al. 2017

Proceedings of the 2017 6th International Conference on Measurement, Instrumentation and Automation (ICMIA 2017)

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“…[10][11][12] For the time being, the EME method is the only method suitable for studying the time development of crack growth (crack-propagation speed, crack-face movement speed, crack length and size, etc.). 13,14 …”

Section: Introductionmentioning

confidence: 99%

Acoustic and electromagnetic emission of lightweight concrete with polypropylene fibers

Štoudek¹,

Trčka²,

Matysík

et al. 2016

Mater. Tehnol.

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This paper is focused on failure monitoring in lightweight concrete (special high-performance concrete that contains porous aggregate with a low bulk density) with high-strength polypropylene fibers under mechanical loading. The aim was to determine how the cracks' generation intensity in the tested concrete samples depends on the fibers' length and quantity. Our diagnostic method is based on a measurement of the acoustic and electromagnetic emission signals, which occur when solid dielectric materials are mechanically stressed. Several groups of lightweight concrete samples with various types and concentrations of high-strength polypropylene fibers were prepared for our experiment. We made two-channel measurements of the concrete samples from each group for defined loading conditions. The first channel was electromagnetic emission (EME) and the second was acoustic emission (AE). The electromagnetic emission and acoustic emission methods are promising methods to study the generation and behavior of cracks. The main advantage of EME and AE is their ability to be detected already in the stressed stage, which prevents macroscopic deterioration in solids. From the obtained results it can be concluded that the generated cracks' intensity is significantly affected by the presence of polypropylene fibers and by their length and dosage. Keywords: acoustic emission, electromagnetic emission, lightweight concrete, fiberŝ lanek je usmerjen na pregled po{kodb pri mehanskem obremenjevanju lahkega betona (poseben visoko zmogljiv beton, ki vsebuje porozne sestavine z majhno gostoto), z visokotrdnostnimi polipropilenskimi vlakni. Namen je bil ugotoviti, kako je intenziteta nastanka razpok odvisna od dol`ine in koli~ine vlaken. Diagnosti~na metoda je temeljila na merjenju akusti~nih signalov in signalov elektromagnetne emisije, ki se pojavijo kadar je trden dielektri~ni material mehansko obremenjen. Za eksperiment je bilo pripravljenih ve~vrst lahkih betonov z razli~no vrsto in koncentracijo visokotrdnostnih polipropilenskih vlaken. Pri dolo~enih pogojih obremenitve smo izvr{ili dvokanalne meritve vzorcev betona iz vsake skupine. Prvi kanal je bila elektromagnetna emisija (EME), drugi pa akusti~na emisija (AE). Metodi elektromagnetne emisije in akusti~ne emisije sta obetajo~i metodi za {tudij nastanka in obna{anja razpok. Glavna prednost EME in AE je, da ju je mogo~e odkriti`e med stanjem napetosti, kar prepre~i lokalne makroskopske po{kodbe v trdnem stanju. Iz dobljenih rezultatov je mogo~e zaklju~iti, da je intenzivnost nastajanja razpoke mo~no odvisna od prisotnosti polipropilenskih vlaken, od njihove dol`ine in odmerka. Klju~ne besede: akusti~na emisija, elektromagnetna emisija, lahki beton, vlakna

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“…The origin of micro-cracks in specimens is detected by using acoustic emission techniques with data samples collected, and, subsequently, the typical acoustic emission data acquired through experiment analyzed by using frequency spectra and other techniques. [10].…”

Section: Introductionmentioning

confidence: 99%

Flexure response of thermal loaded concrete specimens by acoustic emission method

et al. 2017

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Abstract. The response to fire of concrete structural members depends on the thermal, mechanical, and deformation properties of concrete. These properties vary significantly with temperature depending on the composition and characteristics of the concrete batch mix as well as heating rate and other environmental conditions. The paper presents the effects of a high temperature on selected physical properties of concrete. The main aim of the article is the evaluation of monitoring concrete properties loaded in a few thermal steps up to 1200 °C. Therefore, the concrete specimens were heated in a programmable laboratory furnace at a heating rate of 5 °C/min. The specimens were loaded at six temperatures, 200 °C, 400 °C, 600 °C, 800 °C, 1000 °C, and 1200 °C maintained for 60 minutes. The acoustic emission activity and some material characteristics were evaluated in a three-point bending test.

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Application acoustic emission method during concrete frost resistance

Cited by 25 publications

References 2 publications

A Study on Testing Concrete Strength by Inversely Regressed Synthesis Ultrasonic-rebound Method

A Study on Testing Concrete Strength by Inversely Regressed Synthesis Ultrasonic-rebound Method

Acoustic and electromagnetic emission of lightweight concrete with polypropylene fibers

Flexure response of thermal loaded concrete specimens by acoustic emission method

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