Production and preparation method of asphalt sand doped with rubber powder

Abstract

The invention provides a method for producing and preparing asphalt sand doped with rubber powder. The method comprises the following steps of synthesizing and grading two grades of aggregates, namely tailing sand, 0-3mm in particle size and 3-5mm in particle size, controlling a compact state of the asphalt after compaction according to the residual void ratio of the synthesis and grading, and adding the rubber powder to be subjected to swelling reaction with the asphalt so that viscosity of the asphalt is increased, and the proportion of the structure asphalt coated with the aggregates being increased; according to the method, the mixing amount of the rubber powder and the asphalt is controlled according to the designed void ratio and the grading forming remaining void ratio, the situation that the mixture completely depends on the designed void ratio during design, the asphalt content is too high due to the fact that the low void ratio is transitionally pursued is avoided, and final asphalt film thickness of the rubber powder-doped asphaltic sand serves as a control value; the mixing amount of the rubber powder and the asphalt is calculated according to the change theory of an asphalt film and the void ratio, so the prepared asphaltic sand has higher stress absorption capacity and excellent pavement performance such as flexibility, deformation coordination and crack resistance, and meanwhile, fine-grained tailing sand is doped, so recycling of solid wastes is realized.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to a production and preparation method of asphalt sand mixed with rubber powder. Background technique [0002] When rainwater falls on the road surface, if it seeps into the interior of the pavement structure layer, under the action of hydrodynamic pressure, it will cause delamination between layers, and early diseases such as pits, cracks, and grain loss will appear. For structures such as bridges and culverts, the road surface will be underwater If it penetrates into the beam and slab, it will corrode the steel bars and affect the safety of the bridge structure, with serious consequences. At present, the pavement structure mostly adopts flexible asphalt mixture, and the base layer is semi-rigid and rigid material. The modulus and stiffness of the surface layer and the base layer are different. Due to the complex environment and load, the pavement surface layer and the bas...

AI Technical Summary

Problems solved by technology

In the design of conventional asphalt sand, the porosity after aggregate synthesis is not considered in the synthetic grading process. As a result, when the asphalt-stone ratio is fixed in the later mixing ratio design, too much asphalt is added to ensure a low porosity, and the asphalt wraps the aggregate. The amount of free asphalt remaining after feeding is relatively large, and segregation is easy to occur

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