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Development of a Method for Measuring Water-Stripping Resistance of Asphalt/Siliceous Aggregate Mixtures.


pdf icon Development of a Method for Measuring Water-Stripping Resistance of Asphalt/Siliceous Aggregate Mixtures. (2548 K)
Nguyen, T.; Byrd, W. E.; Bentz, D. P.; Seiler, J. F., Jr.

NISTIR 5865; 49 p. July 1996.

Sponsor:

National Research Council, Washington, DC

Available from:

National Technical Information Service
Order number: PB96-202296

Keywords:

building technology; adhesions; aggregates; asphalt; bonding strength; FT-IR; interface; spectroscopy; stripping; water

Abstract:

The main objective of this project was to develop a nondestructive, sensitive, spectroscopic method for measuring water stripping resistance at the molecular level of asphalt/siliceous aggregate mixtures exposed to water. The study consisted of three phases. Phase 1 involved the development of a technique based on Fourier transform infrared spectroscopy in the multiple internal reflection mode to quantify the water layer at the interface between an asphalt and a siliceous aggregate. Phase 2 was to develop a technique to measure the adhesion loss of an asphalt/aggregate system exposed to water environment. And Phase 3 aimed to relate the quantity of the interfacial water layer with the adhesion loss data. This final report summarizes the research in those three areas. In addition, the report also presents the results on the use of the spectroscopic technique for evaluating the effectiveness of different antistripping agents for asphalts. And finally, based on the interfacial water information, the mechanisms of stripping of an asphalt from a siliceous aggregate and of the transport of water from the environment to the asphalt/aggregate interface are presented.