Polymeric Additives and Their Role in Asphaltic Pavements. Part I: Effect of Additive Type on the Fracture and Fatigue Behavior

Abstract

The effect of polymer modifier type on the fracture and fatigue be havior of AC-5 asphalt mixture was studied. Three polymer modifiers which belong to the general group of thermoplastic polymers; styrene-butadiene- styrene block copolymer (Kraton), ethylene vinyl acetate (Elvax) and polyeth ylene (Novophalt) were considered. Beams were prepared from AC-5 asphalt binder containing 6% of each polymer modifier by weight and the same grada tion. Flexural static tests were performed to evaluate the three polymer modifiers in comparison with unmodified AC-5 asphalt mixture. It was found that in general all three polymers increase the strength and the modulus of the asphalt pavement. SBS (Kraton) exhibits the highest flexibility and strength at room temperature (70°F). Invoking the modified crack layer model, fatigue crack propagation analysis revealed the superiority of the Kraton modified asphalt mixture to both Elvax and Novophalt mixtures. The modified crack layer model analysis of asphaltic pavements yields important information since it accounts for a combined comparison on the basis of crack speed, measured energy release rate, and the change in work expended on damage for mation and history dependent viscous dissipative processes.

Keywords

polymer modifiers asphaltic pavements fracture and fatigue behavior.

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References

Terrel, R.L. and J.L. Walter. 1986. "Modified Asphalt Pavement Materials: The European Experience," Proc. Assoc. of Asphalt Paving Tech., St. Paul, MN, pp. 482-518.

Takallou, H.B. and R.G. Hicks. Transportation Research Record 1171. Washington, D.C.: TRB, National Research Council, pp. 113-120.

Little, D.N. 1991. "Performance Assessment of Binder-Rich Polyethylene Modified Asphalt Concrete Mixtures (Novophalt),"

Presented at 70th Annual Meeting of the Transportation Research Board, Washington, D.C

Little, D.N. and J.W. Button et al. 1985. "Investigation of Asphalt Additives," FHWA-R-D87/001.

Better Roads, July 1989, p. 39.

Narusch, F.P. 1982. "Alaska Experience with Rubberized Asphalt Concrete Pavements, 1979-1982," Div. of Design and Construction, Alaska Dept. of Transportation and Public Facilities, Central Region.

Aglan, H. 1993. Int. J. Damage Mech., 2:53-72.

Aglan, H. et al. 1992. Transportation Research Record 1353 . Washington, D.C.: TRB, National Research Council, pp. 24-30.

Aglan, H. and L. Figueroa. 1993. J. of Eng. Mech. , 119(6).

10.

Aglan, H. et al. 1993. "Effect of Dynamic Compaction on the Fatigue Behavior of Asphalt Concrete Mixtures," Transportation Research Board 72nd Annual Meeting, Washington, D.C.

11.

Aglan, H. et al. In press. "The Effect of Styrene-Butadiene-Styrene Block Copolymer on the Fatigue Behavior of Asphalt Concrete Mixtures," Transportation Research Board, National Research Council.

12.

Chudnovsky, A. 1986. "Crack Layer Theory," 10th U.S. Conf. on Appl. Mech., J. P. Lamb, ed., Houston, TX: ASME, p. 97.

13.

Aglan, H. and A. Chudnovsky et al. 1990. Int. J. of Fract. , 44:167.

14.

Aglan, H. 1990. J. of Elastomers and Plastics , 22:199.

15.

Rice, J.R. 1968. Journal of Applied Mechanics , 35:379.

16.

Begley, J.A. and J.D. Landes. 1972. "The J-Integral as a Fracture Criterion," in ASTM STP 514, p. 1.

17.

Aglan, H. and L. Figueroa. 1992. "Structure-Fracture Toughness Relationships of Asphalt Concrete Mixtures under Fatigue Loading," Year-end technical report, U.S. Army Corps of Engineers, Waterways Experiment Station .

18.

Ohio Department of Transportation Specification. 1989. Construction and Mateirals Specifications , State of Ohio, Columbus, p. 112.