Crack self-healing bituminous concrete and preparation method thereof

Abstract

The invention relates to a crack self-healing bituminous concrete and a preparation method thereof. The bituminous concrete comprises coarse aggregate, fine aggregate, fillers, pitch, rigid fiber and flexible fiber, wherein the mixing amount of the rigid fiber is 0.50-2.5wt.% of the total amount of the coarse aggregate, the fine aggregate, the fillers and the pitch, and the mixing amount of the flexible fiber is 0.10-0.35wt.% of the total amount of the coarse aggregate, the fine aggregate, the fillers and the pitch. The preparation method of the concrete comprises the steps of weighing dried aggregates, placing the aggregates in a material containing disk, mixing the aggregates uniformly, preheating in a drying oven to the temperature of 180 DEG C, and heating the fillers separately to the temperature of 180 DEG C; preheating the pitch to the temperature ranging between 160 DEG C and 175 DEG C; drying the rigid fiber and the flexible fiber respectively for backup use according to the requirement; and firstly mixing the rigid fiber into the mixed aggregate with blending, then blending the aggregate and the liquid pitch, then blending with the fillers, then blending with the flexible fiber, and finally forming the bituminous concrete. According to the bituminous concrete and the preparation method, the low-temperature cracks of bituminous pavements are reduced to the minimum and can be healed spontaneously, early-stage cracking is avoided effectively, the service life of the bituminous pavements is prolonged, and the project implementation is convenient.

Description

technical field

[0001] The invention relates to asphalt concrete, in particular to a rigid-flexible fiber composite modified asphalt concrete capable of improving the crack resistance of asphalt pavement and a preparation method thereof. Background technique

[0002] Cracks are one of the most important diseases of asphalt pavement. The generation of cracks not only destroys the integrity, continuity and aesthetics of the pavement, but also creates conditions for freeze-thaw and water damage, which eventually leads to structural damage of the asphalt pavement, and has to invest a lot of manpower and material resources for repair or reconstruction.

[0003] There are many factors that affect the quality of asphalt pavement, among which the performance of materials directly affects the function and service life of the pavement. Therefore, it is necessary to design an asphalt mixture with good comprehensive pavement performance and excellent crack resistance by starting with th...

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