Experimental Study On Fatigue Property Of Fiber Reinforced Asphalt Concrete

Along with the development of economy, the highway construction in china obtains unprecedented space. At the end of 2007, the mileage of highway has already reached more than 50000 kilometers. The highway construction has achieved fruitful achievement in a short period. The development takes convenient to mass of people, but also causes many problems about the property of pavement. Many highways that have been built recently destroy before design life. To deal with this phenomenon, fiber reinforced asphalt concrete attaches the attention of researcher because of its advantages in decreasing crack and increasing the life of pavement.The paper works at the fatigue property of fiber reinforced asphalt, adopts densely -graded bituminous concrete and stone matrix asphalt as the experimental material, adds Bonifibers in densely-graded bituminous concrete and uses it to take place of xylogen in the stone matrix asphalt. By contrasting the results of flexural beam fatigue test, the paper obtains the difference between these kinds of material. With the help of software, the paper receives the fatigue equation from the fatigue curve, analyzes the influence made by fibers on fatigue parameters. Under the creep test, the study investigates the nature of fiber reinforced asphalt concrete and common asphalt concrete in creep speed, creep distortion and creep module. Burgers model and modified Burgers model are used to fit the results of creep test.The test results show that fiber reinforced asphalt concrete has better fatigue performance. For densely-graded bituminous concrete, adding Bonifibers in it decreases the dependence on the stress level for fatigue property. Using Bonifibers as the alternative fiber for stone matrix asphalt increases the dependence on the stress level for fatigue property. The densely-graded bituminous concrete and stone matrix asphalt perform different nature in fatigue distortion and fatigue life. In the aspect of creep test, fiber reinforced asphalt concrete has better capability to resist the creep distortion. In the aspect of module, fiber reinforced asphalt concrete decreases the attenuation. With the help of software, the paper gets the viscoelastic parameters and Burgers model and modified Burgers model are proved that can well describe the viscoelasticity of fiber reinforced asphalt concrete.