Fatigue Cracking Resistance of Fiber-Reinforced Asphalt Concrete

Abstract

The influence of fibers on the fatigue cracking resistance of asphalt concrete is investigated using fracture energy. Nylon, a popular facing yarn of carpets, is used for the actual recycled carpet fibers in asphalt pavement. The experimental program is designed with two phases: the single fiber pull-out test and the indirect tension strength test. Through pull-out tests of 15-denier single nylon fibers, the critical fiber embedded length is determined to be 9.2 mm. As for indirect tension strength tests, samples of asphalt concrete mixed with nylon fibers of two lengths, 6 and 12 mm, based on results of the pull-out tests (critical embedded length) and three volume fractions, 0.25, 0.5, and 1%, are prepared and tested. Asphalt concrete samples fabricated with fibers of 1% and 12 mm results in 85% higher fracture energy than non-reinforced specimens, showing improved fatigue cracking resistance. Although an optimized asphalt mix design with fibers has not been developed for this study, the increased fracture energy represents a potential for improving asphalt fatigue life, which may be facilitated through the use of recycled carpet fibers.

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References

AASHTO R30, Standard Practice For Mixture Conditioning of Hot Mix Asphalt, American Association of State Highway and Transportation Officials :

AASHTO TP9, Ruggedness Evaluation of AASHTO TP7 and TP9: Phase 1 Indirect Tensile Strength Test, American Association of State Highway and Transportation Officials .

ASTM D2256-02, Tensile Properties of Yarns by the Single-Strand Method, American Society for Testing and Materials, West Conshohocken, PA , 2000.

Beaudoin, J. J. , “Handbook of Fiber-Reinforced Concrete—Principles, Properties, Developments and Applications,” Noyes Publications, Park Ridge, NJ , 1990.

Bentour, A. , and Mindess, S. , “Fiber Reinforced Cementitious Composites,” Elsevier Science, NY , 1990.

Hondros, G. , Evaluation of Poisson’s Ratio and the Modulus of Materials of a Low Tensile Resistance by the Brazilian (Indirect Tensile) Test with Particular , Austr. J. Appl. Sci. 10 (3), 243-268 (1959).

Huang, Y. H. , “Pavement Analysis and Design,” Prentice Hall, Englewood Cliffs, NJ , 1993.

Kim, K. W. , Doh, Y. S. , and Lim, S. , Mode I Reflection Cracking Resistance of Strengthened Asphalt Concretes , Construc. Build. Mater. 13, 243-251 (1999).

Kwak, K. H. , and Kim, J. J. , Fatigue Strength in Polymer-Reinforced Concrete Beams under Cyclic Loading , Nuclear Eng. Design 156, 63-73 (1995).

10.

MiniFIBERS, Inc., 2923 Boones Creek Road, Johnson City, TN 37615.

11.

Serfass, J. P. , and Samanos, J. , Fiber-Modified Asphalt Concrete Characteristics, Applications and Behavior , Assoc. Asphalt Paving Technol. 65, 193-230 (1996).

12.

The Asphalt Institute , Superpave Mix Design, Superpave Series No.2 (SP-2), Lexington, KN , 1996.

13.

Wang, Y. , Backer, S. , and Li, V. C. , An Experimental Study of Synthetic Fiber Reinforced Cementitious Composites , J. Mater. Sci. 22, 4281-4291 (1987).

14.

Wang, Y. , Wu, H. C. , and Li, V. C. , Concrete Reinforcement with Recycled Fibers: A Review , J. Mater. Civil Eng. 12, (4), 314-319 (2000).

15.

Wang, Y. , Zureick, A. H. , Cho, B. S. , and Scott, D. E. , Properties of Fiber Reinforced Concrete Using Recycled Fibers from Carpet Industrial Waste , J. Mater. Sci. 29, (16), 4191-4199 (1994).

16.

Wen, H., Fatigue Performance Evaluation of WesTrack Asphalt Mixtures Based on Viscoelastic Analysis of Indirect Tensile Test, Doctoral dissertation, NCSU, 2001.