Full Field Imaging of High pH Levels in Concrete

Masoud Ghandehari*, Engui Liu, Christian Brückner, Gamal Khalil, Jill Worlinsky, Michael Hyland

*Corresponding author for this work

Research output: Chapter in Book or Report/Conference proceedingChapterpeer-review

1 Citation (Scopus)


In this chapter we discuss an optical method used for direct measurement of pH in Portland cement concrete with high spatial and temporal resolution. This approach is designed to better enable the study and analysis of high pH dependent degradation reactions, and hydration reaction in cement-based composites. We demonstrate that the halochromic sensor molecule is suitable for this purpose. Results of experiments showing spatial distribution of early stage carbonation and reaction involving silica aggregates are highlighted at pH levels between ~11.0 to ~13.5. Results are compared with the commercially available pH indicator Phenolphthalein.

Original languageEnglish
Title of host publicationSmart Sensors, Measurement and Instrumentation
PublisherSpringer International Publishing
Number of pages13
Publication statusPublished - 2018
Externally publishedYes

Publication series

NameSmart Sensors, Measurement and Instrumentation
ISSN (Print)2194-8402
ISSN (Electronic)2194-8410

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