Experimental Study on Basalt Fiber Crack Resistance of Asphalt Concrete Based on Acoustic Emission

Abstract

In this study, the semicircle three-point bending tests of ordinary asphalt concrete and basalt fiber asphalt concrete were carried out and acoustic emission parameters were collected during the test. The differences of the characteristics of acoustic emission parameters between basalt fiber asphalt concrete and ordinary asphalt concrete were analyzed, and the damage stages were divided based on the variation of acoustic emission parameters; Rise Angle and Average Frequency were introduced to study the cracking mode and crack resistance mechanism of asphalt concrete with basalt fiber. The results show that the acoustic emission parameters can well represent the toughening and crack resistance effect of basalt fiber in asphalt concrete, and the damage stages can be divided into three stages: microcrack initiation stage, fracture stage, and residual stage. The duration of the fracture stage and the load resistance time of the specimen were greatly prolonged. The proportion of shear events in the whole failure process increased greatly after the basalt fibers were added, especially in the fracture stage, which reduced the tensile failure tendency of the specimens, and thus improved the bending and tensile performance of the specimens and played a toughening and crack resistance role in the fracture stage.

Recent Advances in Basalt Fiber Reinforced Asphalt Mixture for Pavement Applications

“…Yang et al [ 43 ] employed the acoustic emission technique to analyze the performance of specimens in semicircular three-point bending tests and concluded that the addition of BFs may block the development of the main macroscopic crack and toughen the mixture. The rapid fracture stage is the main stage during which BFs provide crack resistance and toughening.…”

Aging Characteristics of Asphalt Binder under Strong Ultraviolet Irradiation in Northwest China

“…From the above test results, it can be seen that the fracture energy of modified asphalt and base asphalt at UV160h were 0.752 and 0.483 MPa, respectively. The higher the fracture energy of the material, the better the crack resistance [51], indicating that the crack resistance of SBS-2 modified asphalt after aging was better than that of base asphalt. Comparing the results of the ductility and BBR tests, it can be concluded that the asphalt crack resistance obtained by the full-face fracture energy method correlated well with these two tests.…”

Study on the Performance of Nano-Zinc Oxide/Basalt Fiber Composite Modified Asphalt and Mixture

“…Adding a small amount of fiber can significantly increase the viscosity of the asphalt mortar, hinder the effective flow of the asphalt, and, to some extent, lower the cracking probability of asphalt mortar, thus improving its low-temperature crack resistance. This provides the theoretical foundation for the popularization and application of BF in asphalt pavement [19][20][21][22].…”