Double-fiber fine-grain type asphalt mixture and preparation method thereof

Abstract

The invention discloses a double-fiber fine-grain type asphalt mixture and a preparation method thereof. The asphalt-aggregate ratio of the asphalt mixture is 5.5 to 6.0 percent; asphalt is modified asphalt in which a non-amine anti-stripping agent accounting for 0.3 percent of the mass of the asphalt is doped; the nominal maximum particle size of aggregates is 13.2 mm; the passing rate of a screen hole of 4.75 mm is 25 to 30 percent, and the passing rate of a screen hole of 0.075 mm is 9 to 11 percent; the filler-bitumen ratio is 1.5 to 2.0; the porosity is 3 to 5 percent; the voids in the mineral aggregates is not less than 15 percent; the asphalt saturation rate is 65 to 80 percent; a fiber stabilizer is prepared from basalt fiber and lignin fiber; the basalt fiber is white flocculent basalt fiber, and the lignin fiber is gray granular lignin fiber; the fiber is automatically added into a blending pot through special fiber adding equipment. The double-fiber fine-grain type asphalt mixture disclosed by the invention is applicable to new construction and maintenance projects of expressways in southern high-temperature rainy districts in summer, and can effectively improve the resistance to rutting and water damage of an asphalt pavement and prolong the service life of the pavement.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and relates to a double-fiber fine-grain asphalt mixture and a preparation method thereof. Background technique [0002] Asphalt pavement has been widely used because of its good driving comfort and superior performance. More than 90% of expressways, first-class highways and urban roads use asphalt pavement. However, with the rapid development of social economy, the increasing number of heavy-duty vehicles in road transportation seriously affects the service life of asphalt pavement, especially the rutting deformation of asphalt pavement is generally large. Therefore, the research and development of high-performance asphalt mixture has become an important development direction for highway construction and maintenance. [0003] At present, asphalt mixture with discontinuous gradation and dense skeleton structure is often used in highway asphalt pavement to reduce rutting deformation of a...

AI Technical Summary

Problems solved by technology

However, with the rapid development of social economy, the increasing number of heavy-duty vehicles in road transportation has seriously affected the service life of asphalt pavement, especially the rutting deformation of asphalt pavement is generally large