A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Ultrasound waves propagation in concrete
This paper presents some experimental results concerning the ultrasound waves propagation in concrete. In the field of non-destructive evaluation of concrete, the ultrasonic wave velocity is usually measured and utilized to predict or correlate the strength of concrete. The impact-echo method is a technique for flaw detection in concrete based on stress wave propagation. A transient stress pulse is introduced into a test object by a mechanical impact generator on the concrete element surface. By this test method the ultrasonic pulse velocity, propagated in concrete specimen can be determined. A device generates low frequency pulses and measures the time taken for pulses to pass between the two transducers placed at the end of the specimen being tested. It meets the testing standard BS1881: Part 203; ASTMC597. The equipment has a pulse generator, an ultrasonic emitting transducer and a sensitive receiver piezoceramic transducer. The piezoceramic emitting transducer is excited by electrical pulses of high voltage amplitude, and converts the electrical signal in mechanical vibrations, which propagate in concrete specimen. The piezoceramic sensor output signal is displayed on the memory digital oscilloscope, type TDS 3023, Tektronix, USA. Also, by signal graphic representation analysis in time and frequency can be determined the attenuation coefficient of the pulse in concrete. In the specialty literature tables with experimental material parameter values for different type of concrete can be found. Therefore, the experimental resultscan be compared with known concrete parameters.
Ultrasound waves propagation in concrete
This paper presents some experimental results concerning the ultrasound waves propagation in concrete. In the field of non-destructive evaluation of concrete, the ultrasonic wave velocity is usually measured and utilized to predict or correlate the strength of concrete. The impact-echo method is a technique for flaw detection in concrete based on stress wave propagation. A transient stress pulse is introduced into a test object by a mechanical impact generator on the concrete element surface. By this test method the ultrasonic pulse velocity, propagated in concrete specimen can be determined. A device generates low frequency pulses and measures the time taken for pulses to pass between the two transducers placed at the end of the specimen being tested. It meets the testing standard BS1881: Part 203; ASTMC597. The equipment has a pulse generator, an ultrasonic emitting transducer and a sensitive receiver piezoceramic transducer. The piezoceramic emitting transducer is excited by electrical pulses of high voltage amplitude, and converts the electrical signal in mechanical vibrations, which propagate in concrete specimen. The piezoceramic sensor output signal is displayed on the memory digital oscilloscope, type TDS 3023, Tektronix, USA. Also, by signal graphic representation analysis in time and frequency can be determined the attenuation coefficient of the pulse in concrete. In the specialty literature tables with experimental material parameter values for different type of concrete can be found. Therefore, the experimental resultscan be compared with known concrete parameters.
Ultrasound waves propagation in concrete
Ultraschallwellenausbreitung in Beton
Chilibon, Irinela (author) / Marat-Mendes, Jose (author)
2005
8 Seiten, 3 Bilder, 1 Tabelle, 4 Quellen
Conference paper
Storage medium
English
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