Use of acoustic emission to detect cavitation and solidification (time zero) in cement pastes

Title: Use of acoustic emission to detect cavitation and solidification (time zero) in cement pastes
Author(s): Jon Couch, Pietro Lura, Ole Mejlhede Jensen, Jason Weiss
Paper category : conference
Book title: International RILEM Conference on Volume Changes of Hardening Concrete: Testing and Mitigation
Editor(s): O. M. Jensen, P. Lura, K. Kovler
Print-ISBN: 2-35158-004-4
e-ISBN: 2351580052
Publisher: RILEM Publications SARL
Publication year: 2006
Pages: 393 - 400
Total Pages: 8
Nb references: 19
Language: English

Abstract: In this study, the acoustic emission activity of cement pastes was investigated during the first day of hydration. Deaired, fresh cement pastes were cast in sealed sample holders that were designed to minimize friction and early-age microcracking. A majority of acoustic emission events were detected in low water to cement ratio pastes around the time of setting. Cement pastes with higher water to cement ratios or with a layer of water on the surface showed significantly less acoustic emission events. This paper shows how acoustic emission might potentially be used to indicate the time when the fluid-solid transition occurs in a cement paste, often referred to as time-zero. Knowledge of time-zero is fundamental in calculations of residual stresses and in determining the risk of cracking.

Online publication: 2006-07-30
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580052.042