Abstract
Fatigue cracking is one of the most important types of failures, which decrease the asphalt pavement service life. Carbon fibers are amongst of the additives that have high tensile strength. It is expected this fiber reduce pavement cracks which increases the fatigue life of pavement. This paper experimentally investigated the effect of the carbon fibers on bitumen specimens. Hence, the effects of fiber characteristics such as length and fiber percentage on the indirect tensile strength and Marshall stability of asphalt mixture were studied. Then, the effect of fibers on bitumen and mastic behavior, which is the main objective of the study, was evaluated. Beam specimens were subjected to three-point bending tests to determine the effect of carbon fibers. Carbon fibers had a positive effect on the tensile strength of bitumen beams at loading rates of 0.5, 2, and 5 mm/min up to 100%. Mastic exhibited a similar behavior to pure bitumen in combination with fibers. 
  
Highlights
1.1 Introduce the ProblemA very common structural pavement distress which leads to crack propagation in asphalt pavements is the fatigue effects
Three loading rates of 0.5, 2, and 5 mm/min were considered for experiments, and all four bitumen beam models were tested at each loading rate to evaluate the effect of the loading rate
Three-point bending test was performed on pure bitumen and mastic as well as the fiber composite
Summary
1.1 Introduce the ProblemA very common structural pavement distress which leads to crack propagation in asphalt pavements is the fatigue effects. Fatigue occurs due to cyclic (or fluctuating) stress experienced by the structure under repetitive forces (Abtahi et al, 2010). These types of cracks first appear as small longitudinal cracks along the road axis and propagated and take the shape of alligator's skin (Abtahi et al, 2010). Fiber is one of the additives most commonly used to extend the fatigue life and improve the tensile properties of asphalt mixtures. Fiber additives are mainly used as the reinforcing materials in asphalt pavements to improve tensile properties and increase the strength to cracking (Arabani & Shabani, 2019)
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