The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Yves Burtschell - One of the best experts on this subject based on the ideXlab platform.
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Correlation between the mechanical behavior and the Ultrasonic Velocity of fiber-reinforced concrete
Construction and Building Materials, 2015Co-Authors: Mouhcine Benaicha, O. Jalbaud, Adil Hafidi Alaoui, Yves BurtschellAbstract:Abstract Ultrasonic Velocity technique is one of the most popular non-destructive techniques used in the assessment of concrete properties. The objectives of this study are (1) to test the use of Ultrasonic velocities in the non-destructive evaluation of the curing degree of fiber-reinforced concrete and (2) to find a correlation between the compressive strength, flexural strength, modulus of elasticity, and the Ultrasonic Velocity. This latter is measured by sensors of 50 mm diameter and 54 kHz frequency, and calculated from the phase slope. The Ultrasonic Velocity measurements were determined with direct, semi-direct and indirect transmission mode. This methodology is based on European standard EN 12504-4. Samples (prismatic: 10 × 10 × 40 cm and cylindrical: 16 × 32 cm) are made with different percentages (varying from 0% to 2.5%) of steel fiber. The results showed that Ultrasonic Velocity can be very useful to study the homogeneity and the quality of steel fiber-reinforced concrete and it is an effective way for the assessment of the consolidation level during and after the curing period (the measurements are taken at ages of 8 h and from 1 to 28 days).
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Prediction of Self-Compacting Concrete homogeneity by Ultrasonic Velocity
alexandria engineering journal, 2015Co-Authors: Mouhcine Benaicha, O. Jalbaud, X. Roguiez, A. Hafidi Alaoui, Yves BurtschellAbstract:Abstract To evaluate the filling capacity of self-compacting concrete SCC without segregation, a technique based on the Ultrasonic Velocity has been adapted in order to estimate homogeneity and quality of concrete at very young age. To monitor local change in Ultrasonic Velocity, the process consists of using a pair of transducers at different depths of the concrete. The aim of our experimental study was to establish the relationship between Ultrasonic Velocity measured by sensors of 50 mm diameter and of 54 kHz frequency, and homogeneity of fresh concrete. Measurements of wave propagation Velocity are carried out every half an hour on a vertical channel whose dimensions (in mm) are 160 × 160 × 700. These measurements have been determined with three modes of transmission: direct, semi-direct and indirect. The different mixtures were prepared with the same Water/Binder ratio (W/B) of 0.28. The amount of binder is in the order of 520 kg/m3. Comparison between Ultrasonic Velocity and empirical tests such as sieve stability test, slump flow test, air content, and compressive strength, at 1 day, shows that the Ultrasonic Velocity can also be very useful to evaluate homogeneity and quality of fresh concrete.
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Prediction of Self-Compacting Concrete homogeneity by Ultrasonic Velocity
Alexandria Engineering Journal, 2015Co-Authors: Mouhcine Benaicha, O. Jalbaud, X. Roguiez, A. Hafidi Alaoui, Yves BurtschellAbstract:To evaluate the filling capacity of self-compacting concrete SCC without segregation, a technique based on the Ultrasonic Velocity has been adapted in order to estimate homogeneity and quality of concrete at very young age. To monitor local change in Ultrasonic Velocity, the process consists of using a pair of transducers at different depths of the concrete. The aim of our experimental study was to establish the relationship between Ultrasonic Velocity measured by sensors of 50 mm diameter and of 54 kHz frequency, and homogeneity of fresh concrete. Measurements of wave propagation Velocity are carried out every half an hour on a vertical channel whose dimensions (in mm) are 160 x 160 x 700. These measurements have been determined with three modes of transmission: direct, semi-direct and indirect. The different mixtures were prepared with the same Water/Binder ratio (W/B) of 0.28. The amount of binder is in the order of 520 kg/m(3). Comparison between Ultrasonic Velocity and empirical tests such as sieve stability test, slump flow test, air content, and compressive strength, at 1 day, shows that the Ultrasonic Velocity can also be very useful to evaluate homogeneity and quality of fresh concrete. (C) 2015 Faculty of Engineering, Alexandria University. Production and hosting by Elsevier B.V.
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Correlation between the mechanical behavior and the Ultrasonic Velocity of fiber-reinforced concrete
Construction and Building Materials, 2015Co-Authors: Mouhcine Benaicha, O. Jalbaud, Adil Hafidi Alaoui, Yves BurtschellAbstract:Ultrasonic Velocity technique is one of the most popular non-destructive techniques Used in the assessment of concrete properties. The objectives of this study are (1) to test the use of Ultrasonic velocities in the non-destructive evaluation of the curing degree of fiber-reinforced concrete and (2) to find a correlation between the compressive strength, flexural strength, modulus of elasticity, and the Ultrasonic Velocity. This latter is measured by sensors of 50 mm diameter and 54 kHz frequency, and calculated from the phase slope. The Ultrasonic Velocity measurements were determined with direct, semi-direct and indirect transmission mode. This methodology is based on European standard EN 12504-4. Samples (prismatic: 10 x 10 x 40 cm and cylindrical: 16 x 32 cm) are made with different percentages (varying from 0% to 2.5%) of steel fiber. The results showed that Ultrasonic Velocity can be very useful to study the homogeneity and the quality of steel fiber-reinforced concrete and it is an effective way for the assessment of the consolidation level during and after the curing period (the measurements are taken at ages of 8 h and from 1 to 28 days). (C) 2015 Elsevier Ltd. All rights reserved.
Bimal K. Sarma - One of the best experts on this subject based on the ideXlab platform.
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Ultrasonic Velocity determination of the phase diagram of UPt3
Physica B-condensed Matter, 1991Co-Authors: Shireen Adenwalla, Louis Taillefer, Moises Levy, John B Ketterson, Z. Zhao, David G. Hinks, Bimal K. SarmaAbstract:Abstract We report Ultrasonic Velocity measurements on two UPt3 samples with three different field orientations (H⊥c, H//c and H∧c=45°). Velocity changes are observed at constant temperatures, as the field is swept, at the upper critical field Hc2 and at the flux lattice transition Hfl. Velocity changes are also observed at Tc + the upper transition temperature and Tc - the lower transition temperature as the temperature is swept at constant fields. Complete phase diagrams for UPt3 obtained by a single measurement technique on the same samples in the H-T plane are presented.
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phase diagram of upt3 from Ultrasonic Velocity measurements
Physical Review Letters, 1990Co-Authors: Shireen Adenwalla, Louis Taillefer, Moises Levy, John B Ketterson, Z. Zhao, David G. Hinks, S W Lin, Q Z Ran, J A Sauls, Bimal K. SarmaAbstract:We present measurements of longitudinal Ultrasonic Velocity on single crystals of the heavy-fermion superconductor ${\mathrm{UPt}}_{3}$. The measurements show clear signatures of second-order phase transitions in the superconducting state, with the Velocity anomalies well accounted for by Ginzburg-Landau theory. From these signatures we construct a phase diagram for ${\mathrm{UPt}}_{3}$ that reveals all the boundary lines that have been identified as possible phase transitions. We are able to track the phase transition lines to a tetracritical point, located on the upper-critical-field curve, to within the width of the normal-superconducting transition.
Mouhcine Benaicha - One of the best experts on this subject based on the ideXlab platform.
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Correlation between the mechanical behavior and the Ultrasonic Velocity of fiber-reinforced concrete
Construction and Building Materials, 2015Co-Authors: Mouhcine Benaicha, O. Jalbaud, Adil Hafidi Alaoui, Yves BurtschellAbstract:Abstract Ultrasonic Velocity technique is one of the most popular non-destructive techniques used in the assessment of concrete properties. The objectives of this study are (1) to test the use of Ultrasonic velocities in the non-destructive evaluation of the curing degree of fiber-reinforced concrete and (2) to find a correlation between the compressive strength, flexural strength, modulus of elasticity, and the Ultrasonic Velocity. This latter is measured by sensors of 50 mm diameter and 54 kHz frequency, and calculated from the phase slope. The Ultrasonic Velocity measurements were determined with direct, semi-direct and indirect transmission mode. This methodology is based on European standard EN 12504-4. Samples (prismatic: 10 × 10 × 40 cm and cylindrical: 16 × 32 cm) are made with different percentages (varying from 0% to 2.5%) of steel fiber. The results showed that Ultrasonic Velocity can be very useful to study the homogeneity and the quality of steel fiber-reinforced concrete and it is an effective way for the assessment of the consolidation level during and after the curing period (the measurements are taken at ages of 8 h and from 1 to 28 days).
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Prediction of Self-Compacting Concrete homogeneity by Ultrasonic Velocity
alexandria engineering journal, 2015Co-Authors: Mouhcine Benaicha, O. Jalbaud, X. Roguiez, A. Hafidi Alaoui, Yves BurtschellAbstract:Abstract To evaluate the filling capacity of self-compacting concrete SCC without segregation, a technique based on the Ultrasonic Velocity has been adapted in order to estimate homogeneity and quality of concrete at very young age. To monitor local change in Ultrasonic Velocity, the process consists of using a pair of transducers at different depths of the concrete. The aim of our experimental study was to establish the relationship between Ultrasonic Velocity measured by sensors of 50 mm diameter and of 54 kHz frequency, and homogeneity of fresh concrete. Measurements of wave propagation Velocity are carried out every half an hour on a vertical channel whose dimensions (in mm) are 160 × 160 × 700. These measurements have been determined with three modes of transmission: direct, semi-direct and indirect. The different mixtures were prepared with the same Water/Binder ratio (W/B) of 0.28. The amount of binder is in the order of 520 kg/m3. Comparison between Ultrasonic Velocity and empirical tests such as sieve stability test, slump flow test, air content, and compressive strength, at 1 day, shows that the Ultrasonic Velocity can also be very useful to evaluate homogeneity and quality of fresh concrete.
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Prediction of Self-Compacting Concrete homogeneity by Ultrasonic Velocity
Alexandria Engineering Journal, 2015Co-Authors: Mouhcine Benaicha, O. Jalbaud, X. Roguiez, A. Hafidi Alaoui, Yves BurtschellAbstract:To evaluate the filling capacity of self-compacting concrete SCC without segregation, a technique based on the Ultrasonic Velocity has been adapted in order to estimate homogeneity and quality of concrete at very young age. To monitor local change in Ultrasonic Velocity, the process consists of using a pair of transducers at different depths of the concrete. The aim of our experimental study was to establish the relationship between Ultrasonic Velocity measured by sensors of 50 mm diameter and of 54 kHz frequency, and homogeneity of fresh concrete. Measurements of wave propagation Velocity are carried out every half an hour on a vertical channel whose dimensions (in mm) are 160 x 160 x 700. These measurements have been determined with three modes of transmission: direct, semi-direct and indirect. The different mixtures were prepared with the same Water/Binder ratio (W/B) of 0.28. The amount of binder is in the order of 520 kg/m(3). Comparison between Ultrasonic Velocity and empirical tests such as sieve stability test, slump flow test, air content, and compressive strength, at 1 day, shows that the Ultrasonic Velocity can also be very useful to evaluate homogeneity and quality of fresh concrete. (C) 2015 Faculty of Engineering, Alexandria University. Production and hosting by Elsevier B.V.
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Correlation between the mechanical behavior and the Ultrasonic Velocity of fiber-reinforced concrete
Construction and Building Materials, 2015Co-Authors: Mouhcine Benaicha, O. Jalbaud, Adil Hafidi Alaoui, Yves BurtschellAbstract:Ultrasonic Velocity technique is one of the most popular non-destructive techniques Used in the assessment of concrete properties. The objectives of this study are (1) to test the use of Ultrasonic velocities in the non-destructive evaluation of the curing degree of fiber-reinforced concrete and (2) to find a correlation between the compressive strength, flexural strength, modulus of elasticity, and the Ultrasonic Velocity. This latter is measured by sensors of 50 mm diameter and 54 kHz frequency, and calculated from the phase slope. The Ultrasonic Velocity measurements were determined with direct, semi-direct and indirect transmission mode. This methodology is based on European standard EN 12504-4. Samples (prismatic: 10 x 10 x 40 cm and cylindrical: 16 x 32 cm) are made with different percentages (varying from 0% to 2.5%) of steel fiber. The results showed that Ultrasonic Velocity can be very useful to study the homogeneity and the quality of steel fiber-reinforced concrete and it is an effective way for the assessment of the consolidation level during and after the curing period (the measurements are taken at ages of 8 h and from 1 to 28 days). (C) 2015 Elsevier Ltd. All rights reserved.
Shireen Adenwalla - One of the best experts on this subject based on the ideXlab platform.
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Ultrasonic Velocity determination of the phase diagram of UPt3
Physica B-condensed Matter, 1991Co-Authors: Shireen Adenwalla, Louis Taillefer, Moises Levy, John B Ketterson, Z. Zhao, David G. Hinks, Bimal K. SarmaAbstract:Abstract We report Ultrasonic Velocity measurements on two UPt3 samples with three different field orientations (H⊥c, H//c and H∧c=45°). Velocity changes are observed at constant temperatures, as the field is swept, at the upper critical field Hc2 and at the flux lattice transition Hfl. Velocity changes are also observed at Tc + the upper transition temperature and Tc - the lower transition temperature as the temperature is swept at constant fields. Complete phase diagrams for UPt3 obtained by a single measurement technique on the same samples in the H-T plane are presented.
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phase diagram of upt3 from Ultrasonic Velocity measurements
Physical Review Letters, 1990Co-Authors: Shireen Adenwalla, Louis Taillefer, Moises Levy, John B Ketterson, Z. Zhao, David G. Hinks, S W Lin, Q Z Ran, J A Sauls, Bimal K. SarmaAbstract:We present measurements of longitudinal Ultrasonic Velocity on single crystals of the heavy-fermion superconductor ${\mathrm{UPt}}_{3}$. The measurements show clear signatures of second-order phase transitions in the superconducting state, with the Velocity anomalies well accounted for by Ginzburg-Landau theory. From these signatures we construct a phase diagram for ${\mathrm{UPt}}_{3}$ that reveals all the boundary lines that have been identified as possible phase transitions. We are able to track the phase transition lines to a tetracritical point, located on the upper-critical-field curve, to within the width of the normal-superconducting transition.
Yuichi Murai - One of the best experts on this subject based on the ideXlab platform.
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Inner structure visualization of fresh fruits utilizing Ultrasonic Velocity profiler
Journal of Visualization, 2018Co-Authors: Taiki Yoshida, Yuji Tasaka, Hyun Jin Park, Yuichi Murai, Hiroki Teramura, Shigenobu KosekiAbstract:We proposed a novel Ultrasonic Doppler–echo visualization method that is expected to realize nondestructive visualization using an Ultrasonic Velocity profiler. The visualization uses information of both the Doppler Velocity and echo intensity that have usually been used by the Ultrasonic Velocity profiler to obtain instantaneous Velocity profiles. The feasibility of the method is confirmed by measurements of a rubber ball, apple, and tomato having different acoustic impedances, pulp hardnesses, shapes, and inner structures. Mathematical relations and image processing parameters were discussed to obtain images of the inner structures of test objects using the Ultrasonic Velocity profiler. Trial measurements of test objects elucidated that the Doppler Velocity and echo intensity detect different features of the test objects. Using the Doppler Velocity and echo intensity, the outlines and inner structures of the objects can be visualized. Graphical abstract
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Ultrasonic Velocity profiling rheometry based on a widened circular couette flow
Measurement Science and Technology, 2015Co-Authors: Takahisa Shiratori, Yuji Tasaka, Yoshihiko Oishi, Yuichi MuraiAbstract:We propose a new rheometry for characterizing the rheological properties of fluids. The technique produces flow curves, which represent the relationship between the fluid shear rate and shear stress. Flow curves are obtained by measuring the circumferential Velocity distribution of tested fluids in a circular Couette system, using an Ultrasonic Velocity profiling technique. By adopting a widened gap of concentric cylinders, a designed range of the shear rate is obtained so that Velocity profile measurement along a single line directly acquires flow curves. To reduce the effect of Ultrasonic noise on resultant flow curves, several fitting functions and variable transforms are examined to best approximate the Velocity profile without introducing a priori rheological models. Silicone oil, polyacrylamide solution, and yogurt were used to evaluate the applicability of this technique. These substances are purposely targeted as examples of Newtonian fluids, shear thinning fluids, and opaque fluids with unknown rheological properties, respectively. We find that fourth-order Chebyshev polynomials provide the most accurate representation of flow curves in the context of model-free rheometry enabled by Ultrasonic Velocity profiling.
