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Frequency Characteristics of Acoustic Emission Signals from Cementitious Wasteforms with Encapsulated Al

Published online by Cambridge University Press:  19 October 2011

Lyubka Spasova  and
Michael I. Ojovan
Lyubka Spasova
Affiliation:
mtp05lms@sheffield.ac.uk, University of Sheffield, of Engineering Materials, Mappin Street, Sheffield, S1 3JD, United Kingdom, +44 114 2225943
Michael I. Ojovan
Affiliation:
M.Ojovan@sheffield.ac.uk, University of Sheffield, Immobilisation Science Laboratory, Department of Engineering Materials, Mappin Street, Sheffield, S1 3JD, United Kingdom
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Abstract

Acoustic emission (AE) signals were continuously recorded and their intrinsic frequency characteristics examined in order to evaluate the mechanical performance of cementitious wasteform with encapsulated Al waste. The primary frequency in the power spectrum and its range of intensity for the detected acoustic waves were potentially related with appearance of different micromechanical events caused by Al corrosion within the encapsulating cement system. In addition the process of cement matrix hardening has been shown as a source of AE signals characterised with essentially higher primary frequency (above 2 MHz) compared with those due to Al corrosion development (below 40 kHz) and cement cracking (above 100 kHz).

Keywords

waste managementacoustic emissioncorrosion
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 985: Symposium NN – Scientific Basis for Nuclear Waste Management XXX , 2006 , 0985-NN10-03
Copyright
Copyright © Materials Research Society 2007

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