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Rapid analysis of chloride content of contaminated concrete
In 1989, the specific ion electrode was identified as
the best field method available to assess the chloride
content of powdered concrete samples. Since the initial
investigation, the manufacturer of the packaged device has
altered the product. The alterations presented a equipment
difference, as well as an increase in cost.
To eliminate the problem of random manufacturer
alternations, a generic method was developed for evaluating
the chloride contents of concrete with the specification
electrode. The method outlined the required equipment, the
proportioning of the calibration solutions, the
proportioning of the concrete digestion solution, and the
measuring procedure. The developed method eliminated the
problems of the digestion reaction temperature and the
measurement inaccuracies of the higher chloride contents by
diluting the measured concentrations.
The testing procedure was validated for field
application by measuring the chloride contents of concrete
samples from four state bridge structures. The analysis of operator variance proved the method was applicable to any
operator capable of following the procedure.