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Modeling and Measuring Chloride Ingress into Cracked Mortar

Scott Jones, National Institute of Standards and Technology, Materials and Structural Systems Division, USA, Jeffrey Davis, John Molloy, John Sieber, Dale Bentz, PNDetector GmbH, Germany, National Institute of Standards and Technology, Chemical Sciences Division, USA, National Institute of Standards and Technology, Chemical Sciences Division, USA, National Institute of Standards and Technology, Materials and Structural Systems Division, USA
2016 unpublished

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Chloride ingress into reinforced concrete structures is a cause of corrosion of steel embedded into concrete. To aid in the prediction of concrete service life, a chloride ingress model that includes the effects of physical absorption to and chemical reaction with the cement matrix as well as time-dependent diffusivity is derived by a mass balance and solved by the finite element method. This model is validated through an experimental program where the chloride concentration around cracked
more » ... mens is measured using microbeam X-ray fluorescence spectrometry (µXRF). Reinforced mortar beams are cast and cracked by three-point bending. The samples are submerged in a chloride solution for time periods between 7 d and 21 d. The data collected from the µXRF scans is processed using a support vector machine (SVM) algorithm to identify the cement paste matrix. The chloride counts in the matrix are processed by a generalized additive model (GAM) to interpolate the counts over the scan domain. The data is calibrated using standards with known chloride concentrations and the results are compared to the finite element based model which shows good agreement between experiments and modeling. This demonstrates the necessity and usefulness of developing a chloride ingress model that accounts for both chloride ion and cement matrix interactions, the time-dependent behavior of the apparent diffusivity, and crack geometry.
doi:10.18552/2016/scmt4d151 fatcat:4eauspf675bdvgrsfuvtpylv3q
Citation

Scott Jones, National Institute of Standards and Technology, Materials and Structural Systems Division, USA, Jeffrey Davis, John Molloy, John Sieber, Dale Bentz, PNDetector GmbH, Germany, National Institute of Standards and Technology, Chemical Sciences Division, USA, National Institute of Standards and Technology, Chemical Sciences Division, USA, National Institute of Standards and Technology, Materials and Structural Systems Division, USA. "Modeling and Measuring Chloride Ingress into Cracked Mortar." (2016)