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Diagnosis of carbonation induced corrosion initiation and progression in reinforced concrete structures using piezo-impedance transducers


Reference:

Talakokula, V., Bhalla, S., Ball, R. J., Bowen, C. R., Pesce, G. L., Kurchania, R., Bhattacharjee, B., Gupta, A. and Paine, K., 2016. Diagnosis of carbonation induced corrosion initiation and progression in reinforced concrete structures using piezo-impedance transducers. Sensors and Actuators A-Physical, 242, pp. 79-91.

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    Official URL:

    http://dx.doi.org/10.1016/j.sna.2016.02.033

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    Abstract

    In addition to chloride induced corrosion, the other commonly occurring type of rebar corrosion in reinforced concrete structures is that induced by the ingress of atmospheric carbon dioxide into concrete, commonly referred to as ‘carbonation induced corrosion’. This paper presents a new approach for detecting the onset and quantifying the level of carbonation induced rebar corrosion. The approach is based on the changes in the mechanical impedance parameters acquired using the electro-mechanical coupling of a piezoelectric lead zirconate titanate (PZT) ceramic patch bonded to the surface of the rebar. The approach is non-destructive and is demonstrated though accelerated tests on reinforced concrete specimens subjected to controlled carbon dioxide exposure for a period spanning over 230 days. The equivalent stiffness parameter, extracted from the frequency response of the admittance signatures of the PZT patch, is found to increase with penetration of carbon dioxide inside the surface and the consequent carbonation, an observation that is correlated with phenolphthalein staining. After the onset of rebar corrosion, the equivalent stiffness parameter exhibited a reduction in magnitude over time, providing a clear indication of the occurrence of corrosion and the results are correlated with scanning electron microscope images and Raman spectroscopy measurements. The average rate of corrosion is determined using the equivalent mass parameter. The use of PZT ceramic transducers, therefore, provides an alternate and effective technique for diagnosis of carbonation induced rebar corrosion initiation and progression in reinforced concrete structures non-destructively.

    Details

    Item Type Articles
    CreatorsTalakokula, V., Bhalla, S., Ball, R. J., Bowen, C. R., Pesce, G. L., Kurchania, R., Bhattacharjee, B., Gupta, A. and Paine, K.
    DOI10.1016/j.sna.2016.02.033
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    URLURL Type
    http://dx.doi.org/10.1016/j.sna.2016.02.033Free Full-text
    Uncontrolled Keywordssem,chloride,corrosion,carbonation,steel reinforced concrete
    DepartmentsFaculty of Engineering & Design > Architecture & Civil Engineering
    Faculty of Engineering & Design > Mechanical Engineering
    Research CentresBRE Centre in Innovative Construction Materials
    Materials Research Centre
    Centre for Advanced Sensor Technologies (CAST)
    EPSRC Centre for Doctoral Training in Statistical Mathematics (SAMBa)
    RefereedYes
    StatusPublished
    ID Code49348

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