@inproceedings{445d51446efb4714a40fb8a0fc962d75,
title = "Monitoring accelerated carbonation on standard Portland cement mortar by nonlinear resonance acoustic test",
abstract = "Carbonation is an important deleterious proce{\ss} for concrete structures. Carbonation begins when carbon dioxide (CO2) present in the atmosphere reacts with portlandite producing calcium carbonate (CaCO3). In severe carbonation conditions, C-S-H gel is decomposed into silica gel (SiO2.nH2O) and CaCO3. As a result, concrete pore water pH decreases (usually below 10) and eventually steel reinforcing bars become unprotected from corrosion agents. Usually, the carbonation of the cementing matrix reduces the porosity, because CaCO3 crystals (calcite and vaterite) occupy more volume than portlandite. In this study, an accelerated carbonation-ageing proce{\ss} is conducted on Portland cement mortar samples with water to cement ratio of 0.5. The evolution of the carbonation proce{\ss} on mortar is monitored at different levels of ageing until the mortar is almost fully carbonated. A nondestructive technique based on nonlinear acoustic resonance is used to monitor the variation of the constitutive properties upon carbonation. At selected levels of ageing, the compre{\ss}ive strength is obtained. From fractured surfaces the depth of carbonation is determined with phenolphthalein solution. An image analysis of the fractured surfaces is used to quantify the depth of carbonation. The results from resonant acoustic tests revealed a progre{\ss}ive increase of stiffne{\ss} and a decrease of material nonlinearity.",
keywords = "Carbonation, Cement based materials, Nondestructive test, Nonlinear acoustic",
author = "Eiras, {J. N.} and T. Kundu and Popovics, {J. S.} and J. Monz{\'o} and Borrachero, {M. V.} and J. Pay{\'a}",
note = "Publisher Copyright: {\textcopyright} 2015 SPIE.; Health Monitoring of Structural and Biological Systems 2015 ; Conference date: 09-03-2015 Through 12-03-2015",
year = "2015",
doi = "10.1117/12.2084124",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Tribikram Kundu",
booktitle = "Health Monitoring of Structural and Biological Systems 2015",
}