OPTICAL PH IMAGING OF CONCRETE EXPOSED TO CHEMICALLY CORROSIVE ENVIRONMENTS

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

Abstract

Major types of chemical concrete degradation such as carbonation, leaching and acid attacks are strongly associated with decreasing internal or external pH. Thus a precise determination of the latter is crucial for the assessment regarding the degree of corrosion and corresponding development of prevention strategies. Conventional pH measure methods for concrete, such as phenolphthalein indicator, pore solution extractions and flat surface electrodes have proven to contain significant limitations and inadequacies. This contribution presents the application of sensor foils based on luminescent pH sensitive dyes entrapped in a polymeric hydrogel matrix, to quantify and image the distribution of surface pH of concrete based construction materials. An imaging technique called time-domain dual lifetime referencing (t-DLR) was used, which suppresses artifacts from scattering of the background and other light inhomogeneities. Using this methodology high-resolution pH profiles of concrete samples exposed to carbonation and biogenic acid corrosion were recorded.
Original languageEnglish
Title of host publicationProceedings of final Conference of RILEM TC 253-MCI
Subtitle of host publicationMicroorganisms-Cementitious Materials Interactions
PublisherRILEM Publications S.a.r.l.
Pages203-208
Publication statusPublished - Jun 2018

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