The Effect of Antistrip Treatments on Asphalt-Aggregate Systems: An Environmental Scanning Electron Microscope Study

Abstract

The performance of three antistrip additives—a lime-treated aggregate, an amine-treated asphalt and a styrene-butadiene rubber-treated aggregate, was studied with an environmental scanning electron microscope (ESEM). Samples were prepared with the untreated asphalt and aggregate, the treated asphalt with untreated aggregate and untreated asphalt with each treated aggregate. The same asphalt and aggregate sources were used in each test and all samples were run in duplicate. All samples were examined along the asphalt-aggregate interface in the ESEM prior to and following each freeze-thaw cycle. The samples were subjected to a total of ten freeze-thaw cycles. All three additives reduced the potential for moisture damage by maintaining asphalt-aggregate adhesion better than the control samples. Based on ESEM observation of the asphalt-aggregate interface before and after freeze-thaw cycling, the styrene-butadiene rubber-coated aggregate samples performed better than the amine-treated asphalt samples which performed better than the lime-treated aggregate samples.

Keywords

moisture damage antistrip additives asphalt concrete ESEM

Get full access to this article

View all access options for this article.

References

1. M. E. Labib , "Asphalt-Aggregate Interactions and Mechanisms for Water Stripping," Preprint American Chemical Society Division of Fuel Chemistry Volume 37, No. 3, August 23-28, 1992.

2. R. P. Lottman , "Predicting Moisture-Induced Damage to Asphaltic Concrete, Field Evaluation," NCHRP Report 246, Transportation Research Board, 1982.

3. D. G. Tunnicliff and R. E. Root , "Use of Antistripping Additives in Asphaltic Concrete Mixtures-Laboratory Phase," NCHRP Report 274, Transportation Research Board, 1984.

4. A. T. Dibenedetto , "General Concepts of Adhesion," Asphalt Adhesion and Interfacial Phenomena, Highway Research Record Number 340, Washington, D. C. 1970.

5. M. E. Labib and P. J. Zanzucchi , "Evaluation of Donor-Acceptor Properties of Asphalts Phase II," Contract Number 87-AIIR-10, Quarterly Report December 1990.

6. FHWA Contract Number DTFH61-92C-00170, "Pyridine Desorption Test for Moisture Susceptibility (Stripping) of Aggregates," Fundamental Properties of Asphalts and Modified Asphalts, Draft Interpretive Final Report, May 1997.

7. A. R. Tarrer and V. P. Wagh , "Innovative tests to Predict the Strength and Type of Asphalt-Aggregate Bonds," Fuel Science and Technology Int'l., 10(4-6), 457-474, 1992.

8. R. L. Dunning , G. O. Schulz and W. R. Gawron , "Control of Stripping With Polymer Treatment of Aggregates," Preprint of Proceedings of the Association of Asphalt Paving Technologists, March 22-24, 1993, Austin, Texas.

9. P. A. Bautista and J. Procter , "Air Monitoring of Liquid Asphalt Additives," Presented Feb. 1992 AAPT Conference, Charleston, S. C.

10.

10. R. P. Lottman and D. L. Johnson , "Pressure-Induced Stripping in Asphaltic Concrete," Asphalt Adhesion and Interfacial Phenomena, Highway Research Record Number 340, Washington, D. C. 1970.

11.

11. T. Nguyen , E. Byrd and J. Seiler , "Development of a Method for Measuring Water-Stripping Resistance of Asphalt/Siliceous Aggregate Mixtures," NCHRP-IDEA Emerging Concepts and Products for Highway Systems, Annual Progress Report 1, December 1994.

12.

12. D. G. Tunnicliff , "Performance of Antistripping Additives," Preprint, Association of Asphalt Paving Technologists, March 17-19, 1997.

13.

13. P. E. Sebaaly , "Evaluation of Antistrip Additives," 34th Annual Meeting of the Petersen Asphalt Research Conference, July 14-16, 1997, Laramie, Wyoming.

14.

14. A. Bhurke , E. E. Shin , and L. T. Drzal , "Fracture Morphology and Fracture Toughness Measurement of Polymer Modified Asphalt Concrete," Preprint 76th Annual Meeting of the Transportation Research Board, January 12-16, 1997, Washington, D. C.

15.

15. S. J. Rozeveld , E. E. Shin , A. Bhurke , L. France , and L. T. Drzal , "Network Morphology of Straight and Polymer Modified Asphalt Cements," Preprint 76th Annual Meeting of the Transportation Research Board, January 12-16, 1997, Washington, D. C.

16.

16. T. M. Williams and F. P. Miknis , "Use of the Environmental SEM to Study Water Stripping and Penetration in Asphalt," J. Materials in Civil Engineering, accepted.