Experimental determination of the attenuation of an ultrasonic wave in concrete

N DT Abstracts This work investigates the possibility of utilizing the p. p-8085 microprocessor for concrete crack depth evaluation. For the purpose of the nondestructive testing, Ultrasonic pulses are important for the nondestructive assessment of concrete quality as well as flaw detection and measurement. This method will be useful in repairing concrete columns.

compressive strength of concrete, as well as from statistical quality analysis. Even when mathematically the degree of accuracy of predicted strength increases, the possibility of errors in this assessment is greatly reduced. 40654 Miyajima, T.; Ogura, Y.; Takishita, T. Trial for spectroscopy in ultrasonic testing of concrete

(In

Japanese)

39424

Journal o f Japanese Society for Non-Destructive Inspection, Vol. 37, No. 9A, pp. 869-870 (Sep. 1988) 40292

Proceedings o f the 4th European C o n f e r e n c e on Non-Destructive Testing, London (United Kingdom), 13-17 Sep. 1987. Vol. 2, pp. 1003-1012. Pergamon Press, 3173 pp. (1988) This article reports the investigations to enhance the informative value of the ultrasonic NDT of concrete. The object of the investigations was the defectoscopy, i.e. the monitoring of homogeneity and detection of localized faults. The testing technique was further developed with regard to amplitude evaluation. A US-inspection system "Sonograf 1000" was developed for this purpose. This new flaw detector automatically evaluates the amplitude with a gated digital logarithmic peak detector, the time of flight and the frequency spectrum of the received signal, so that it became possible to record C-scans of precast concrete components by fully automatic procedure. C-scans clearly show the artificially introduced defects and the homogeneity of the material.

Hara, Tadakatu, lshii, Yugoro; Yoshikawa, Satoshi.

D i s t r i b u t i o n o f p u l s e v e l o c i t y a n d s o u n d p r e s s u r e in m o r t a r a n d c o n c r e t e b y u l t r a s o n i c test

Fifth Pan Pacific C o n f e r e n c e on Nondestructive Testing, Vancouver (Canada), Apr. 1987, pp. 220-228. Atomic Energy o f Canada Limited, A E C L - 9 3 9 4 (Mar. 1987) Investigations of concrete structures showing some distress has been performed to prevent further deterioration. A laboratory investigation of the application of ultrasonic pulse velocity in concrete has been conducted. The authors used a longitudinal wave probe at various frequencies, and found that the frequency has no significant effect in the propagation of pulse velocity in the concrete. Ultrasonic testing in concrete structures has been found to be more convenient when considering the distribution of the pulse wave, which can define radial propagation direction in the transducer. 39903

Kozlov, V.N.; Shevaldykin, V.G.; Yakovlev, N.N.

Experimental determination wave in concrete

37314 AI-Chlabi, A.R.; Raouj; W.Z.A.; Al-Tak, H.H.; Abdul Karim, M.A.H.

of the attenuation of an ultrasonic

C o n c r e t e s t r e n g t h u l t r a s o n i c digital t e s t e r Journal o f Nondestructive Evaluation, Vol. 5, No. 3/4, pp. 157-160 (Dec. 1986) This paper describes the design and construction of a concrete strength ultrasonic digital meter. The method depends on the transmission and reception of two ultrasonic sinusoidal signals. These two signals are so processed so as to yield a digital output number representative of the speed of propagation through the concrete specimen. This velocity figure can be related to the applications on finding the concrete crush strength, concrete crack depth, as well as the concrete behavior with electrical curing temperature. The electronic system employs Complementary-Oxide Semiconductor logic circuits and hybrid conversion circuits. It consumes such a little power, which makes such a design transportable and hence a battery operated device.

Soviet Journal o f Nondestructive Testing, Vol. 24, No. 2, pp. 132-140 (Feb. 1988) The basic technical difficulties occurring in experimental determination of the attenuation coefficient of longitudinal ultrasonic vibrations in concrete are analyzed and possible means of overcoming them are shown. Measurements of results for attenuation coefficients at frequencies of 50-300 kHz in concretes, differing in material and particle size of the coarse filler, are given. 39895 Roy, S.K.; Murthy, C.K.; Krishnamurthy, N. Statistical s t u d y o f p r i n c i p a l p a r a m e t e r s f o r p u l s e v e l o c i t y a n d compressive

strength of concrete

Materials Science Forum, Vols. 34-36, No. 2, pp. 1077-1085 (1988). Proceedings o f the International Ceramic Conference A U S T C E R A M ' 8 8 Sydney, Australia, 21-26 Aug. 1988. C.C. Sorrell, B. Ben-Nissan (Eds.) This paper is concerned with the statistical analysis of the four dominant parameters affecting concrete strength as related to the pulse velocity, namely: water content, cement content, ageing and cement type. Two types of cement and two levels (low and high) of the other three parameters were investigated by means of 2 factorial experiment. The measured responses for pulse velocity and compressive strength were analysed for statistical significance. 39582

36471

application

to

concrete

crack

Sadegzadeh,M.; Kettle, R.

Indirect and non-destructive resistance of concrete

methods

for assessing

abrasion

Magazine o f concrete Research, Vol. 38, No. 137, pp. 183-190 (Dec. 1986) Three non-destructive test methods have been investigated to determine their suitability as indirect methods for assessing the abrasion resistance of concrete slabs. The ultrasonic pulse velocity technique was not found to be sufficiently sensitive to variation in the concrete mix design. The surface hardness method, using the Schmidt rebound hammer, was found to be partially sensitive to factors which are known to influence the abrasion resistance of concrete. The initial surface absorption method was found to be very sensitive to these factors and was closely related to abrasion resistance of concrete as determined by an accelerated abrasion test.

Abdul-Amir, A.N.; Abdul-Karim, M.A.H.

Microprocessor measurement

Hillger, W.

Inspection of concrete by ultrasonic testing

depth

Journal o f Nondestructive Evaluation, Vol. 6, No. 2, pp. 67-72 (Jun. 1987)

The subjects covered in previous issues from February 1993 onwards are: Acoustic and ultrasonic measurement of elastic constants - 27(1); Acoustic emission testing of pressure vessels - 26(6); Bridge inspection - 28(6); Condition monitoring using acoustic and thermal techniques - 27(4); Eddy current probes - 28(4); Finite element method in ultrasonics - 29(4); Infrared thermography in Nondestructive Testing - 29(6); Magnetic flux leakage - 26(1); Magnetic methods in the inspection of #pea - 30(1); Microwave NDT - 27(6); NDT in railways - 26(4); NDT using backscatter of ultrasound 26(5); NDT using Compton scattering - 28(3); Neural networks in ultrasonic and acoustic testing - 29(I); Positron annihilation - 27(5); Radar inspection in civil engineering 28(5); Radiography of welds - 29(3); Study of defects in composites by acoustic emission - 30(2); Synthetic aperture signal processing - 26(3); Thermography of composites 26(2); Ultrasonic NDE of aircraft - 27(3); Use of eddy currents in defect detection - 30(3); X-ray tomography - 27(2) Each entry in N D T Abstracts consists of the serial number in the National N D T Centre Information Store for identification purposes; the title of the paper, book or report; the name of the author; the name of the source journal or document and the abstracts. Where necessary, author's names and the title of foreign journals have been transliterated into the Latin alphabet according to British Standard BS 2979:1958.

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