The Use of Complex-Modulated Signals to Increase the Accuracy of Measurements of the Velocity of Ultrasound in Concrete

Kachanov, V. K.; Соколов, И. В.; Fedorov, M. B.; Kontsov, R. V.

doi:10.1007/s11018-015-0800-5

Cited by 4 publications

(2 citation statements)

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“…The travelling distance of the sound is known or measured and the velocity of the sound is calculated as the quotient of the distance and time. This velocity is directly proportional to the density of the medium in which the sound is travelling [13]. By using this method, apart from strength estimation procedure, the increase of strength can be followed [14] and it is also useful for fault and layer thickness detection [15], determination of the amount pf carbonation [16].…”

Section: Ultrasonic Velocity Measurementsmentioning

confidence: 99%

Non-Destructive Strength Estimation of Lightweight Aggregate Concretes

Nemes

Simon

2017

MSF

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The porosity, water absorbing capability, internal load bearing system of light weight aggregate concretes differ from ordinary concrete.In case of structural concretes there is often a demand of non-destructive testing, but between the available, connected modifying parameters there are none which are suitable for the special case of light weight aggregate concretes. Particularly big difference in the strength estimation may be observed in case early age concretes, when the moisture content is typically significantly higher than in ordinary concrete.Experiments were executed on structural concretes out of different aggregates (quartz gravel, expanded clay, foamed glass). The tests were carried out at the concretes ages of 3, 7, 28, 91 and 360 days by destructive (cube crushing strength) and two non-destructive testing methods (rebound hammer and ultrasonic). The results are compared and models are drawn.

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Section: Ultrasonic Velocity Measurementsmentioning

confidence: 99%

Non-Destructive Strength Estimation of Lightweight Aggregate Concretes

Nemes

Simon

2017

MSF

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“…However, due to a large attenuation of the ultrasonic body wave propagation in concrete, the embedded PZT patch monitoring of the concrete causes the internal damage of concrete; therefore, this technique has limitations in detecting the hydration reaction at different curing ages. Kachanov et al found that the dielectric properties are related to the pore structure and moisture content characteristics, and they reflect the formation of the microstructure and the hydration reaction process [ 14 , 15 , 16 ]. For early age concrete, however, there is very limited information on monitoring the hydration process based on the measurement of dielectric properties by the GPR method [ 17 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Early-Age Hydration Reaction and Strength Formation Mechanism of Solid Waste Silica Fume Modified Concrete

et al. 2021

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Solid waste silica fume was used to replace fly ash by different ratios to study the early-age hydration reaction and strength formation mechanism of concrete. The change pattern of moisture content in different phases and micro morphological characteristics of concrete at early age were analyzed by low field nuclear magnetic resonance (LF-NMR) and scanning electron microscope (SEM). The results showed that the compressive strength of concrete was enhanced optimally when the replacement ratio of solid waste silica fume was 50%. The results of LF-NMR analysis showed that the water content of modified concrete increased with the increase of solid waste silica fume content. The compressive strength of concrete grew faster within the curing age of 7 d, which means the hydration process of concrete was also faster. The micro morphological characteristics obtained by SEM revealed that the concrete was densest internally when 50% fly ash was replaced by the solid waste silica fume, which was better than the other contents.

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