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Abstract
A titration method for measuring the weight percent of amine-based liquid antistrip additives in asphalts and pavements was developed. The technique involves measuring the alkalinity of the sample and relating that to the measured alkalinities of both the pure asphalt and the pure additive in order to ascertain the additive concentration. This approach proved to be at least semi-quantitative, capable of measuring additive concentrations to within about 0.2% out of total additive concentrations of around 1.0%. It is required that samples of both the pure additive and the pure asphalt be available for comparison; it will not be possible to avoid this requirement due to chemical similarities between the additives and the asphalts. It is, however, possible to measure the difference in additive concentrations between two samples of pavement with a sample of just the pure additive; a pure asphalt sample is not necessary.