Mixing device and mixing method for fiber modified asphalt concrete

Abstract

The invention discloses a mixing device and a mixing method of fiber modified asphalt concrete. The mixing device comprises a heating mechanism for heating asphalt, and the heating mechanism comprises a material containing barrel for containing the asphalt; a mixing mechanism is arranged right above the material containing barrel, the mixing mechanism comprises an upper frame body and a reciprocating telescopic mechanism installed on the upper frame body, the telescopic end of the reciprocating telescopic mechanism vertically faces downwards and right faces an opening of the material containing barrel, and a mixing head is installed at the telescopic end of the reciprocating telescopic mechanism, so that the mixing head can extend into and draw out of the material containing barrel along the axial direction under the action of the reciprocating telescopic mechanism so as to mix asphalt in the material containing barrel. The mixing device for the fiber modified asphalt concrete has the advantages of being ingenious in structural design, convenient to operate and use, capable of reducing the probability of fiber climbing rod winding, beneficial to improving the fiber dispersion rate and the like. The mixing device for the fiber modified asphalt concrete has the advantages of reducing the probability of fiber climbing rod winding, beneficial to improving the fiber dispersion rate and the like.

Description

technical field [0001] The invention relates to the technical field of asphalt modification, in particular to a mixing device and a mixing method for fiber-modified asphalt concrete. Background technique [0002] Asphalt pavement occupies a very important position in the pavement structure of highways in our country, and about 85% of expressways use asphalt pavement. The most notable advantage of asphalt as a paving material is that it has good adhesion, but its disadvantages are that it is easy to deform and flow at high temperature, easy to crack at low temperature and low in tensile strength. With the development of the synthetic fiber industry, studies have found that adding synthetic fiber materials to asphalt can improve its thermal stability, low temperature crack resistance, durability and tensile strength. However, since synthetic fiber materials are not soluble in asphalt, and the aspect ratio of synthetic fibers is large (up to 150 or more), during the traditiona...

AI Technical Summary

Problems solved by technology

However, since synthetic fiber materials are not soluble in asphalt, and the aspect ratio of synthetic fibers is large (up to 150 or more), during the traditional high-speed mixing process with asphalt, fiber materials are easy to climb poles around the shaft, and fiber wrapping occurs easily, and , when the stirring rod installed on the stirring shaft rotates at high speed in the asphalt, since the direction of rotation remains unchanged, when the fibers in the asphalt touch the facing side of the stirring rod, they will continue to gather on the facing side of the stirring rod, and the fibers gather After a certain thickness, one part will fall off from the facing side to form a "fiber ball", and the other part will always adhere to the facing side

"Fiber balls" not only lead to an increase in the amount of fiber, but also have the defects of low dispersion efficiency and poor dispersion uniformity, which cannot achieve the effect of fiber pitch composite reinforcement

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