Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 327, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.128906
Keywords
Fluorescent probe; pH sensor; Optical fiber sensor; Optode; Concrete; pH of concrete; Hydration of concrete; Fluorescence
Funding
- IRSN
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An optical fiber sensor using a fluorescent molecular probe has been developed to measure the pH of cementitious materials, showing reversible and reliable responses to pH changes. It has the necessary characteristics for concrete study, with a response time of 100 seconds and a precision of +/- 0.1 pH units.
An optical fiber sensor based on a fluorescent molecular probe has been developed to measure the pH of cementitious materials, from the early stages of hydration to advanced ageing of the material. A fluorescent molecular probe, Naphth-AlkyneOMe was entrapped in a cross-linked polyvinyl alcohol-glutaraldehyde matrix to generate thin films with well-defined physicochemical and photophysical properties. The obtained sensing films, with an average thickness of 150 mu m, have showed reversible and reliable responses to pH changes. The developed optode has the required characteristics for the study of concrete, with a response time of 100 s and a precision of +/- 0.1 pH units. Measurements of pH were performed on the surface of low-pH cement paste samples after 4, 6, 7 and 8 days of hydration.
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