Acoustic emission monitoring of fresh cementitious material

Author(s): Evin Dildar A Dzaye, Geert De Schutter, and Dimitrios Aggelis
Paper category: Proceedings of the International RILEM Conference Materials, Systems and Structures in Civil Engineering 2016 Segment on Fresh Concrete
Editor(s): Lars N. Thrane, Claus Pade, Oldrich Svec and Nicolas Roussel
ISBN: 978-2-35158-184-1
e-ISBN: 978-2-35158-185-8
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 116-125
Total Pages: 10
Language : English

Abstract: The implementation of non-destructive evaluation of fresh concrete by stress waves has attracted increasing attention. Monitoring the properties of cementitious materials is necessary in order to obtain better quality control. In this study, passive monitoring by acoustic emission (AE) is applied on the samples while in the fresh state. The elastic waves are detected by suitable sensors which transform the pressure wave on the surface to electric signals. Preliminary experiments have shown that after mixing and during hydration a large rate of acoustic activity is registered in cementitious materials. This is due to a number of mechanisms, like segregation, bleeding, bubble and water transport and early age cracking. In an attempt to clearly characterize the different signals, experiments are performed in cement paste and mortar while the contribution of aggregates is first examined in specimens with controlled number of aggregates. This way the movement and contact between particles is closely monitored and the acoustic signature they emit is defined. During the AE monitoring, ultrasonic pulse velocity is also followed to define the setting time. The AE properties of the fresh material are correlated to the hardened properties as obtained by mechanical tests.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00

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