Methodology for Non-Destructive Identification of Thickness of Unilaterally Accessible Concrete Elements by Means of State-of-the-Art Acoustic Techniques

Abstract

The paper presents a methodology for comprehensive use of ultrasonic tomography and impact-echo Á the state-of-the-art acoustic techniques Á for non-destructive identification of the thickness of unilaterally accessible concrete elements. Since the techniques are not commonly used, they are little known. Therefore, a brief description of the techniques is given to facilitate the understanding of the subsequently presented methodology. The article gives a practical example of the use of the methodology, which demonstrates its suitability for non-destructive identification of the thickness of concrete elements, particularly those only accessible from one side. In the example, the concrete shell of a heat pipe, carrying tunnel located under a river was tested using the ultrasonic tomography and impact-echo techniques. The tests were carried out according to the proposed methodology. It should be noted that the test results yielded by the two methods were similar. In this way, the proposed methodology has been validated.

Non-destructive identification of pull-off adhesion between concrete layers

“…The values of the following parameters are recorded: -average mobility N av , -stiffness K d , -mobility slope M p /N, -average mobility times mobility slope N av ·M p /N, -voids index v. Table 3 Synthetic description of acoustic impact-echo method [54][55][56][57][58][59].…”

“…The methodology uses parameters estimated on the concrete substrate layer surface by the latest 3D laser scanning method [37][38][39][40][41][42][43][44][45][46][47][48][49][50] and parameters estimated on the floor surface by the impulse response and impact-echo methods [51][52][53][54][55][56][57][58][59] and ANN.…”

Binarna analiza obrazów z tomografii ultradźwiękowej

“…pęknięć, wtrąceń, czy pustek powietrznych. Niezwykle ważna w przebiegu badań jest prawidłowa interpretacja uzyskanych zobrazowań i ich analiza [1][2][3][4]. Stąd nadal trwają prace i poszukiwane są metody dokładniejszej analizy tych zobrazowań.…”

Non-destructive and semi-destructive diagnostics of concrete structures in assessment of their durability

“…This method is one of the latest acoustic methods [24][25][26][27][28]. It is suitable for testing up to 2500 mm thick unilaterally accessible concrete members in order to determine their thickness, detect cracks invisible on the surface, foreign inclusions, air voids or areas filled with a liquid or a material whose physical properties differ from those of the surrounding concrete [25].…”