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| Materials | Dosages | Fiber cut length | Type of asphalt binder | Optimum content based on fatigue results | Fatigue
test | Test temp | Mode of loading | References |
|
| CF | 1%, 3%, and 5% by wt. of asphalt binder | 20 mm | PG 64-16 | 3% | ITFT | 5°, 25°C | Controlled stress | Arabani and Shabani [49] |
| Using up to 3% of CF significantly improved the fatigue life of the asphalt mixture due to the augmentation of the binder-aggregate bonds |
|
| GF | 0.1%–0.5% by wt. of mix. | 20 mm | 80–100 pen grade | 0.3% | ITFT | 40°C | — | Abdelaziz et al. [50] |
| Addition of 0.1%, 0.2%, and 0.3% GF increased the fatigue life of the asphalt mixture by about 28.2%, 37.2%, and 44.4%, respectively |
|
| GF | 0.15 by wt. of mix. | 10 mm | PG 64-16 | — | 4BFT | 25°C | Controlled strain | Shukla et al. [51] |
| Using GF improved the fatigue life of the asphalt mixture by 29% and 28% at strain levels of 300 and 500 μ, respectively |
|
| GF | 0.3% and 0.6% by wt. of mix. | 6 and 12 mm | 60–70 pen grade | — | ITFT | 25°C | Controlled stress | Enieb et al. [25] |
GF increased the fatigue resistance of the asphalt mixture by imparting desirable tensile strength to the mixture. Furthermore, the aged mixtures reinforced by GF had higher fatigue resistance. The GF length did not have a significant impact on fatigue performance
Fiber length had no significant effect on the mechanical properties of asphalt mixtures |
|
| Polyolefin-glass fiber | 0.06%, 0.12%, and 0.18% by wt. of mix. | 12 mm | PG 64-16 | 0.12% | ITFT | 20°C | Controlled stress | Ziari and Moniri [52] |
| Incorporation of 0.12% polyolefin-glass fiber in asphalt mixtures increased the fatigue life at both stress levels of 250 and 500 kPa by approximately 67% and 41%, respectively |
|
| GF + diatomite | 0.1%–0.3% by wt. of mix. | 12 mm | AH-90 | — | ITFT | 16.5°C | — | Guo et al. [53] |
| Diatomite and GF enhanced the fatigue behavior of the control asphalt mixture. GF solved the disadvantage of diatomite on low-temperature deformation property of asphalt mixture |
|
| Steel fiber | 2%–4% by wt. of asphalt binder | 1, 3, 5, and 7 mm | 80–100
pen grade | 4% | 4PBT | 15°C | — | Liu et al. [54] |
5 mm length and 4% content of steel fiber showed the best healing performance and the fatigue life recovery
rate reached 70.77% |
|
| Steel fiber | 1% by wt. of asphalt binder | 25 mm | — | — | 4PBT | 25°C | — | Paluri et al. [55] |
(i) Using fibers contributed toward dissipating energy and helped to bridge the cracks distributed during fatigue loading
(ii) The addition of steel fibers increased the calculated fatigue strength of the RAP-based concrete mixby 50%–65% |
|
| Rock wool fiber | 0.2, 0.4, 0.6, and 0.8% by wt. of mix. | — | 60–70
pen grade | 0.8% | ITFT | 15°, 25°C | Controlled stress | Behbahani et al. [56] |
| The fatigue life of modified mixtures with different amounts of rock wool from low to high was enhanced by 4%, 32%, 35%, and 65% |
|
| Aramid fiber + polyolefin fiber | 0.05% by wt. of mix. | 19 mm | 60–70
pen grade | — | ITFT | 25°C | Controlled stress | Takaikaew et al. [57] |
| The incorporation of fibers had a more significant impact on deformation value and enhanced resistance to fatigue cracking |
|
| Aramid fiber + polyolefin fiber | — | 19 mm | PG 70-16 | — | 4PBT | 21°C | Controlled strain | Klinsky et al. [58] |
| The fatigue life was higher for the HMA with fibers at moderate to low strain. However, the fatigue behavior at the highest strain levels needs further evaluation |
|
| PET, Crumb PET | PET: 0.5, 1.0%, 1.5%, and 2.0% by wt. of asphalt binder
Crumb PET: 1% and 2% by wt. of asphalt binder | 10 and 20 mm | 60–70
pen grade | PET:1%
Crumb PET: 2% | 4PBT | 20°C | Controlled strain | Dehghan and Modarres [59] |
| Utilizing of 20 mm long PET fiber at the rate of 1% demonstrated greater effectiveness than 10 mm long fiber. The fatigue lives of modified specimens with 1% and 2% crumb PET were 148% and 163% of the reference one, respectively |
|
| Polyester fiber | 0.25%, 0.50%, and 0.75% by wt. of mix. | 6.35 and 12.70 mm | 40–50
pen grade | 0.50% | 3PBT | 20°C | Controlled strain | Ismael and Taher [60] |
| The addition of fibers really enhanced the fatigue resistance since the repetitions to failure increased by 9.40% for the 0.50% of 12.70 mm fibers length |
|
| Polyester fiber | 0.20%, 0.35%, and 0.50% by wt. of mix. | 6 mm | AH-90 | 0.35% | 3PBT | 20°C | Controlled strain | Xu et al. [61] |
| The improvement of fatigue characteristics is due to the three-dimensional networking influence of fibers in asphalt mixture and stabilization of asphalt binder on the aggregate surface |
|
| Polyester fiber | 0.3% by wt. of asphalt binder | 6 mm | AH-70 | — | ITFT | 15°C | Controlled stress | Wu et al. [62] |
| Fatigue behavior of the asphalt mixture was improved by the addition of fiber, particularly at lower stress levels |
|
| Bamboo fiber–polyester fiber | 0.3% by wt. of mix. | 6 mm | PG 52-22 | — | DTCFT | 18°C | Controlled strain | Jia et al. [63] |
| Compared with the polyester fiber asphalt mixture, the bamboo fiber asphalt mixture showed a smaller fatigue performance after long-term aging, due to the higher oil absorption and weak dispersion |
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