A kind of mixing device and mixing method of fiber-modified asphalt concrete

Abstract

The invention discloses a mixing device and a mixing method for fiber-modified asphalt concrete. The mixing device includes a heating mechanism for heating asphalt, and the heating mechanism includes a container for containing the asphalt; A mixing mechanism is arranged directly above, and the mixing mechanism includes an upper frame body and a reciprocating telescopic mechanism installed on the upper frame body. , A mixing head is installed on the telescopic end of the reciprocating telescopic mechanism, so that the mixing head can extend into and out of the material cylinder in the axial direction under the action of the reciprocating telescopic mechanism to mix the asphalt in the material cylinder. The fiber-modified asphalt concrete mixing device of the invention has the advantages of ingenious structure design, convenient operation and use, can reduce the probability of fiber climbing rods around the axis, and is beneficial to improve the fiber dispersion rate. It is beneficial to improve the fiber dispersion rate and other advantages.

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] In the pavement structure of highways in my country, asphalt pavement occupies a very important position, and about 85% of expressways use asphalt pavement. As a paving material, the most significant advantage of asphalt is good adhesion, but its disadvantage is that it is easy to deform and flow at high temperature, easy to crack at low temperature and low 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 the synthetic fiber material does not dissolve in the asphalt, and the synthetic fiber has a large aspect ratio (over 150), in the traditional high-speed mixi...

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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