Monitoring accelerated carbonation on standard Portland cement mortar by nonlinear resonance acoustic test

J. N. Eiras, Tribikram Kundu, J. S. Popovics, J. Monzó, M. V. Borrachero, J. Payá

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Carbonation is an important deleterious proceß 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 proceß is conducted on Portland cement mortar samples with water to cement ratio of 0.5. The evolution of the carbonation proceß 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 compreßive 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 progreßive increase of stiffneß and a decrease of material nonlinearity.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSPIE
Volume9438
ISBN (Print)9781628415414
DOIs
StatePublished - 2015
EventHealth Monitoring of Structural and Biological Systems 2015 - San Diego, United States
Duration: Mar 9 2015Mar 12 2015

Other

OtherHealth Monitoring of Structural and Biological Systems 2015
CountryUnited States
CitySan Diego
Period3/9/153/12/15

Keywords

  • Carbonation
  • Cement based materials
  • Nondestructive test
  • Nonlinear acoustic

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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  • Cite this

    Eiras, J. N., Kundu, T., Popovics, J. S., Monzó, J., Borrachero, M. V., & Payá, J. (2015). Monitoring accelerated carbonation on standard Portland cement mortar by nonlinear resonance acoustic test. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 9438). [94380D] SPIE. https://doi.org/10.1117/12.2084124