Application of ultrasonic pulse velocity test to concrete assessment in structures after fire

• Autorzy: Wróblewska Julia , Kowalski Robert , Głowacki Michał , Juchnowicz-Bierbasz Bogumiła

Identyfikatory

DOI

10.24425/ace.2021.138062

Warianty tytułu

PL

Wykorzystanie metody ultradźwiękowej do oceny betonu w konstrukcjach po pożarze

• Języki publikacji: EN

Abstrakty

EN

The paper presents the description and results of ultrasonic pulse velocity tests performed on heated beams. The studies aimed to verify the suitability of the UPV method for the assessment of the damaged external layer in the cross-section of RC members after a fire. Four beams heated in a planned way from the bottom (a one-way heat transfer) for 60, 120, 180 and 240 minutes and one unheated beam were examined. The tests were performed using an indirect UPV method (linear measurement on the heated surface). Reference tests were conducted using a direct UPV method (measurement across the member section, parallel to the isotherm layout). Exponential transducers were used for testing concrete surface, which was degraded in high temperature and not grinded. The estimated thicknesses of the destroyed external concrete layer corresponded to the location of the isotherm not exceeding 230°C. Therefore, this test can be used to determine at which depth in the member crosssection the concrete was practically undamaged by high temperature.

PL

W artykule przedstawiono opis i wyniki badań mających na celu sprawdzenie przydatności metody ultradźwiękowej do oceny jakości betonu w konstrukcjach po pożarze. W warunkach pożarowych w przekroju elementów żelbetowych występuje nieustalony przepływ ciepła. Powierzchnia elementów nagrzewa się szybciej niż ich wnętrze. Największa degradacja betonu zachodzi w strefie przypowierzchniowej. W związku z tym podczas oceny konstrukcji po pożarze szczególnie istotne jest określenie grubości zewnętrznej warstwy przekroju elementu, w której beton jest na tyle uszkodzony, że należy go uznać za zniszczony. Metoda ultradźwiękowa jest znormalizowana i powszechnie stosowana do badania betonu in situ. Mierzony jest czas przejścia fali ultradźwiękowej w betonie pomiędzy, umieszczonymi na jego powierzchni, głowicą nadawczą i odbiorczą betonoskopu. W warunkach zwykłych na podstawie prędkości fali można oszacować wytrzymałość betonu na ściskanie, stosując zależności korelacyjne.

Słowa kluczowe

EN

concrete; high temperature; damage; fire; ultrasonic pulse velocity; UPV; linear measurement; exponential transducers

PL

beton; temperatura wysoka; uszkodzenie; pożar; metoda ultradźwiękowa; pomiar liniowy; głowice eksponencjalne

• Wydawca: Komitet Inżynierii Lądowej i Wodnej PAN ; Politechnika Warszawska, Wydział Inżynierii Lądowej
• Czasopismo: Archives of Civil Engineering
• Rocznik: 2021
• Tom: Vol. 67, nr 3
• Strony: 395--413
• Opis fizyczny: Bibliogr. 35 poz., il., tab.

Twórcy

autor

Wróblewska Julia

• Warsaw University of Technology, Faculty of Civil Engineering, Warsaw, Poland

• https://orcid.org/0000-0003-3383-4223

autor

Kowalski Robert

• Warsaw University of Technology, Faculty of Civil Engineering, Warsaw, Poland

• https://orcid.org/0000-0002-0876-3489

autor

Głowacki Michał

• Warsaw University of Technology, Faculty of Civil Engineering, Warsaw, Poland

• https://orcid.org/0000-0003-2494-3225

autor

Juchnowicz-Bierbasz Bogumiła

• Warsaw University of Technology, Faculty of Civil Engineering, Warsaw, Poland

• https://orcid.org/0000-0002-4511-8235

Bibliografia

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