Study of the decalcification process in mortars degraded by NH4NO3 by using ultrasonic techniques
Water takes part in most if not all of the degradation processes experienced by cement-based materials during their service-life. The effect of pure water usually is not of primary concern as it involves very lengthy degradation diffusion controlled processes; aqueous solutions are more aggressive,...
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Consejo Superior de Investigaciones Científicas
2009-12-01
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doaj-4ed7ba1a103a4678bf608a23773b5cbd2021-05-05T07:36:30ZengConsejo Superior de Investigaciones CientíficasMateriales de Construccion0465-27461988-32262009-12-0159296173610.3989/mc.2009.46008145Study of the decalcification process in mortars degraded by NH4NO3 by using ultrasonic techniquesI. Segura0A. Moragues1D. E. Macphee2J. J. Anaya3M. Molero4Instituto de Automática Industrial (CSIC), MadridUniversidad Politécnica de MadridUniversidad de AberdeenInstituto de Automática Industrial (CSIC), MadridInstituto de Automática Industrial (CSIC), MadridWater takes part in most if not all of the degradation processes experienced by cement-based materials during their service-life. The effect of pure water usually is not of primary concern as it involves very lengthy degradation diffusion controlled processes; aqueous solutions are more aggressive, promoting increased solubility of matrix components and microstructure modification due to leaching. The ability to monitor such changes nondestructively presents a number of challenges as, often, conventional characterisation techniques require sample preparation likely to modify the properties of interest. In this study, ultrasonic pulse velocity profiles have provided a nondestructive means of monitoring microstructural changes during aggressive leaching of blastfurnace slag cement mortars with ammonium nitrate solutions. These data are compared with corresponding analyses by destructive techniques including mercury intrusion porosimetry (MIP), water porosity measurements, X-ray diffraction (XRD) and scanning electron microscopy (SEM). By analysing degraded ultrasonic velocity profiles it has been possible to calculate degraded depths in the samples, which correlate well with those results obtained by conventional methods.http://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/151mortardurabilityageingmicrostructurecharacterization |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
I. Segura A. Moragues D. E. Macphee J. J. Anaya M. Molero |
spellingShingle |
I. Segura A. Moragues D. E. Macphee J. J. Anaya M. Molero Study of the decalcification process in mortars degraded by NH4NO3 by using ultrasonic techniques Materiales de Construccion mortar durability ageing microstructure characterization |
author_facet |
I. Segura A. Moragues D. E. Macphee J. J. Anaya M. Molero |
author_sort |
I. Segura |
title |
Study of the decalcification process in mortars degraded by NH4NO3 by using ultrasonic techniques |
title_short |
Study of the decalcification process in mortars degraded by NH4NO3 by using ultrasonic techniques |
title_full |
Study of the decalcification process in mortars degraded by NH4NO3 by using ultrasonic techniques |
title_fullStr |
Study of the decalcification process in mortars degraded by NH4NO3 by using ultrasonic techniques |
title_full_unstemmed |
Study of the decalcification process in mortars degraded by NH4NO3 by using ultrasonic techniques |
title_sort |
study of the decalcification process in mortars degraded by nh4no3 by using ultrasonic techniques |
publisher |
Consejo Superior de Investigaciones Científicas |
series |
Materiales de Construccion |
issn |
0465-2746 1988-3226 |
publishDate |
2009-12-01 |
description |
Water takes part in most if not all of the degradation processes experienced by cement-based materials during their service-life. The effect of pure water usually is not of primary concern as it involves very lengthy degradation diffusion controlled processes; aqueous solutions are more aggressive, promoting increased solubility of matrix components and microstructure modification due to leaching. The ability to monitor such changes nondestructively presents a number of challenges as, often, conventional characterisation techniques require sample preparation likely to modify the properties of interest. In this study, ultrasonic pulse velocity profiles have provided a nondestructive means of monitoring microstructural changes during aggressive leaching of blastfurnace slag cement mortars with ammonium nitrate solutions. These data are compared with corresponding analyses by destructive techniques including mercury intrusion porosimetry (MIP), water porosity measurements, X-ray diffraction (XRD) and scanning electron microscopy (SEM). By analysing degraded ultrasonic velocity profiles it has been possible to calculate degraded depths in the samples, which correlate well with those results obtained by conventional methods. |
topic |
mortar durability ageing microstructure characterization |
url |
http://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/151 |
work_keys_str_mv |
AT isegura studyofthedecalcificationprocessinmortarsdegradedbynh4no3byusingultrasonictechniques AT amoragues studyofthedecalcificationprocessinmortarsdegradedbynh4no3byusingultrasonictechniques AT demacphee studyofthedecalcificationprocessinmortarsdegradedbynh4no3byusingultrasonictechniques AT jjanaya studyofthedecalcificationprocessinmortarsdegradedbynh4no3byusingultrasonictechniques AT mmolero studyofthedecalcificationprocessinmortarsdegradedbynh4no3byusingultrasonictechniques |
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1721468497722081280 |