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24. Estimation of degraded depth in decalcified cement mortars by simplified modeling and ultrasonic velocity measurements



Title: 24. Estimation of degraded depth in decalcified cement mortars by simplified modeling and ultrasonic velocity measurements
Author(s): I. Segura, M. Molero, A. Moragues, J.J. Anaya, T. Sanchez
Paper category : conference
Book title: NUCPERF 2009 - Long Term Performance of Cementitious Barriers and Reinforced Concrete in Nuclear Power Plants and Waste Management
Editor(s): V. L'Hostis, R. Gens, C. Gallé
Print-ISBN: 978-2-35158-072-1
e-ISBN: 978-2-35158-087-5
Publisher: RILEM Publications SARL
Publication year: 2009
Pages: 221 - 228
Total Pages: 8
Nb references: 16
Language: English


Abstract: This study was carried out in cement mortars made from 4 different types of cement, containing different types (blastfurnace slag, fly ash and limestone filler) and different quantities of additions. Samples were decalcified in an accelerated way by immersing them under a concentrated ammonium nitrate solution for a total time of 32 days. Assessment of degradation was done combining destructive and non-destructive characterization of degraded and native samples. In order to estimate the degraded depth, a simplified model that uses parameters from the native material was developed. By using this simplified degradation model and ultrasonic velocity measurements, it has been possible to estimate the degradation depth of the samples. Results obtained show a good correlation of model estimations with experimental results, with an approximately average error value of 10 %.


Online publication: 2009-11-16
Publication type : full_text
Public price (Euros): 0.00


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