American Society of Civil Engineers


Probing pH Levels in Civil Engineering Materials


by Cristian Vimer, M.ASCE, (Proj. Engr., Wexler Assoc., New York, NY 10001. E-mail: cvimer01@utopia.poly.edu), Siukei Yu, M.ASCE, (Undergraduate Student, Dept. of Civ. Engrg., Polytechnic Univ., New York, NY 11201. E-mail: syu05utopia.poly.edu), and Masoud Ghandehari, (corresponding author), M.ASCE, (Assoc. Prof., Dept. of Civ. Engrg., Polytechnic Univ., Brooklyn, NY 11201 E-mail: masoud@poly.edu)

Journal of Materials in Civil Engineering, Vol. 21, No. 2, February 2009, pp. 51-57, (doi:  http://dx.doi.org/10.1061/(ASCE)0899-1561(2009)21:2(51))

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Document type: Journal Paper
Abstract: Optical spectroscopy is a viable approach for subsurface monitoring of pH levels in civil engineering materials. In this work, we describe a method by which optical fibers may be implemented as probes for the in situ measurement of pH levels. This paper describes the development of a nanoporous polymeric matrix, which hosts pH-sensitive chromoionophores. Details of how this pH indicator is strongly attached to the polymer chains through hydrogen bonds are described. Experiments are conducted in the laboratory in aqueous media for monitoring pH levels in highly alkaline and moderately acidic regions. Some detail on indicator immobilization, and signal reversibility are also reported.


ASCE Subject Headings:
Corrosion
Degradation
pH
Carbonation
Acids
Material properties