Study on fatigue self-healing properties of basalt fiber asphalt mixture

Abstract

Asphalt concrete pavement will age gradually and produce fatigue damage under the repeated load and environment. Under the repeated action of driving load and the continuous influence of external environment, it will gradually age and produce fatigue damage. It is found that the asphalt mixture has self-healing characteristics, and it is of positive significance to improve the service life of asphalt pavement by giving full play to the self-healing characteristics of asphalt mixture. With the extensive application of basalt fiber asphalt mixture, its self-healing characteristics have become an urgent problem to be studied. In this paper, according to the four-point bending fatigue test of basalt asphalt mixture, the slope ratio of fatigue curve is selected as the recovery. The effects of basalt fiber asphalt mixture on its self healing ability under three factors, such as damage degree, healing time and healing temperature, were analyzed by orthogonal test, and compared with matrix asphalt mixture and SBS modified asphalt mixture. The results showed that the self healing capacity of asphalt mixture was inversely proportional to the damage degree and time. When the damage degree is more than 50%, the healing performance of the matrix asphalt mixture decreases obviously, and the SBS modified asphalt mixture almost does not heal, while the healing performance of the basalt fiber asphalt mixture is the best.