Mechanism of action of basalt fibers in asphalt

1、 Adsorption and viscosity enhancement of fibers

Fiber and asphalt mixed with a very large specific surface area, making the area into the wetting and adsorption interface and viscosity enhancement. In the dividing layer of fiber surface, asphalt single molecule arrangement to form a structural asphalt interface layer, bear the role of transferring and buffering asphalt and fiber stress. Through the basalt fiber adsorption, stabilization, toughening, crack-blocking and viscosity-enhancing effects, experimental analysis of the role of basalt fibers in asphalt mixtures, and scanning electron microscope images obtained by scanning electron microscopy method confirms that the fiber's adsorption capacity is strong. By basalt fiber asphalt concrete specimens between the rupture surface in tension, and after the field emission environment scanning electron microscope test apparatus collected images, from the microscopic point of view to analyze the role of the crack-resistant, explaining the low-temperature resistance to cracking mainly depends on the role of the crack-resistant.

2、 Stabilization of fibers

Fibers in the asphalt mixture to three-dimensional dispersion state distribution, so that the free asphalt within the mixture to reduce the proportion of structural asphalt increased, so that the viscosity of the asphalt mortar increased, the temperature stability has been improved. Through research and analysis, the results show that the addition of basalt fibers after the asphalt mixture of low-temperature cracking performance has been significantly improved, the formation of basalt fibers in the three-dimensional network structure, the development of cracks in asphalt mixtures play a good role in delaying the development of the overall performance has played a better protective role.

3、Reinforcement and crack-blocking effect of fibers

Fibers in the mixture of three-dimensional random distribution, the formation of three-dimensional spatial grid structure, the asphalt mastic cracking played a crack-blocking, slowing down the crack development time, improve the performance of recycled asphalt pavement cracking resistance. Some researchers through the analysis of test results, respectively, described the fiber blended into the asphalt mixture after the adsorption, stabilization, viscosity, reinforcement, crack-blocking effect, toughening effect, as well as the fiber to increase the ability to heal the role of the mechanism, the results obtained by the fiber on the asphalt mixture to improve the performance of the anti-cracking effect is significant.

Comprehensive research results, the role of basalt fibers can be summarized as follows: fibers in the asphalt mixture is an irregular three-dimensional mesh structure distribution, with a tandem skeleton function, in the initial cracking of asphalt mixture to play a role in stretching, preventing the cracks from further expansion.