Results 271 to 280 of about 15,172 (317)

Ultrasonic pulse velocity as a way of improving uniaxial compressive strength estimations from Leeb hardness measurements

, 2020
Uniaxial compressive strength (UCS) is one of the most important parameters in rock mechanics. Nevertheless, there are instances when it is not advisable to perform UCS standardised tests, because it is not possible to sample or because it is not ...
M. Gómez-Heras, D. Benavente, C. Pla, J. Martínez-Martínez, R. Fort, V. Brotons   +5 more
semanticscholar   +1 more source

Measurement of ultrasonic velocity with improved accuracy in pulse echo setup

Review of Scientific Instruments, 2007
In the present work a personal computer based circuit adopted in pulseecho setup has been developed for the measurement of time-of-flight between the two successive echoes using a differential time measurement with a 16bit counter and an external clock frequency of 32MHz.
S, Rajagopalan, S J, Sharma, P K, Dubey
openaire   +2 more sources

Monitoring the Self-healing of Concrete from the Ultrasonic Pulse Velocity

Journal of Composites Science, 2019
Concrete has the ability to naturally heal its cracks, in a process called self-healing. This article aimed to analyze the self-healing of concretes, evaluating the influence of fly ash and the age of occurrence of cracks.
Ronaldo A Medeiros-Junior, Medeiros-Junior Ronaldo A   +1 more
exaly   +2 more sources

Acoustic emission and ultrasonic pulse velocity of concrete

International Journal of Cement Composites and Lightweight Concrete, 1982
Abstract Both acoustic emission and ultrasonic pulse velocity measurements were used to try to monitor the structural integrity of concrete. Specimens in the form of 150 mm cubes were loaded monotonically to failure, and acoustic emission and ultrasonic pulse velocity were measured simultaneously.
openaire   +1 more source

Measurement of velocity of propagation from ultrasonic pulse-echo data

Ultrasound in Medicine & Biology, 1982
A method is proposed for determining velocity of propagation of ultrasound in tissue by processing the pulse-echo data obtained from a compound scan. Individual sectors from different transducer positions are reconstructed and a suitable area common to the two sectors is selected.
D E, Robinson, F, Chen, L S, Wilson
openaire   +2 more sources

The Dispersion of Ultrasonic Pulse Velocity in Cylindrical Rods

The Journal of the Acoustical Society of America, 1954
Velocity dispersion of compressional stress waves in cylindrical rods of 61S-T6 aluminum alloy has been investigated experimentally. Electronically generated pulses of the desired shape and carrier frequency were used to drive the barium titanate and quartz transducers. Both the pulse echo and pulse transmission methods were employed. It was found that
L. Y. Tu, J. N. Brennan, J. A. Sauer
openaire   +1 more source

Investigation of the effects of aggregate textural properties on compressive strength (CS) and ultrasonic pulse velocity (UPV) of concrete

, 2020
Aggregate is the most volume covering component in concrete. The strength and durability properties of the aggregate can affect the hardened and fresh concrete properties.
Kadir Güçlüer
semanticscholar   +1 more source

Prediction of compressive strength and ultrasonic pulse velocity of admixtured concrete using tree model M5P

Structural Concrete, 2020
The quality of concrete was assessed based on measurements of ultrasonic pulse velocity (UPV) and compressive strength. Portland cement (PC) was substituted with silica fume (SF), fly ash (FA) and blast furnace slag (BFS) as mineral admixtures.
A. F. Kocamaz, Y. Ayaz, M. Karakoç, İ. Türkmen, Ramazan Demirboğa   +4 more
semanticscholar   +1 more source

Implementation of a novel pulsed ultrasonic Doppler velocity profiler

SPIE Proceedings, 2003
The objective of the work is to apply advanced digital signal processing (DSP) and pulsed Doppler echography techniques to analyze velocity profile of the measured fluid in a closed full-pipe. In order to reliably measure velocity profile where non-intrusive ultrasonic Doppler velocity profilers (UDVPs) cannot properly transmit and receive ultrasonic ...
Shounan Luo, Yan Liu, Guanping Feng
openaire   +1 more source

Ultrasonic Pulse Velocity Technique for Inspection and Evaluation of Timber

Journal of Materials in Civil Engineering, 2000
The ultrasonic pulse velocity technique was used to assess the structural integrity of timber elements in monumental buildings. Six species of timber of different strength values were selected to establish the pulse velocity ranges. The effect of moisture content, specific gravity, internal voids, and external voids on the pulse velocity was measured ...
T. Shaji, S. Somayaji, M. S. Mathews
openaire   +1 more source