Attenuation-frequency analysis of the ultrasonic monitoring at early stages of the CBM curing process.

Author(s): José V. Fuente, Jorge Gosalbez, Alicia Carrión, Guillermo Pérez, Alba Font, Virginia Yagüe
Paper category: Proceedings
Book title: Proceedings of the 2nd International RILEM/COST Conference on Early Age Cracking and Serviceability in Cement-based Materials and Structures Volume 1
Editor(s): Stéphanie Staquet and Dimitrios Aggelis
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 79-84
Total Pages: 6
Language : English

Abstract: Within the extended round robin test programme (RRT) of the TU1404 Cost Action, an intensive ultrasonic monitoring at early time of the curing process of cement pastes and concrete mixtures has been conducted. The objective of the experimental work is detecting and assessing the setting time and the hardening progress by means of ultrasonic parameters extracted from intensive continuous monitoring. For this purpose, three different concrete mixtures were made. The first two mixtures were the OC (ordinary concrete) and the MOC (modified ordinary concrete) that correspond to the reference ones. Also, it has been included a third one (OC+) that corresponds to a lower water/cement ratio mixture. This one was included to observe the ultrasonic behavior in a denser concrete matrix.
The reference monitored parameters were the VICAT for pastes and the inner/outer temperature and humidity of the curing process. To monitor this experimental, two different ultrasonic setups were applied: through-transmission and wave reflection factor. For the first setup, the estimated ultrasonic parameters during the curing process were: wave velocity estimation and ultrasonic frequency-attenuation dependence. In this case, both narrowband and broadband signals from 10 kHz up to 1000 kHz were used. For the wave reflection factor setup, a 500 kHz signal pulse was used to estimate the evolution of the acoustic impedance between a steel block and the concrete mixture. In most of the analyzed cases, the ultrasonic parameters have been correlated with setting time and hardening progress.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00

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