Road design method and mixing method

Abstract

The invention discloses a road design method. According to the spatial structure of a direct mixing type semi-flexible asphalt mixture, a mix proportion design method which determines the mineral aggregate gradation of a mixture matrix and optimal asphalt content and cement paste content is established. In combination with the demulsification and coagulation characteristics of modified emulsified asphalt, the invention puts forward a mixing method for the direct mixing type semi-flexible asphalt mixture which includes a sequence of adding various materials and mixing time. The invention can directly obtain the semi-flexible asphalt mixture by a mixing mode under the condition of normal temperature, and not only are the defects of conventional pouring type semi-flexible pavement materials, including high energy consumption, high pollution and complex construction process, effectively prevented, but also the defects of conventional asphalt mixture, including insufficient high-temperature stability and overhigh cement concrete pavement stiffness, are overcome.

Description

technical field [0001] The invention belongs to the field of composition design of road building materials, and in particular relates to a mixing ratio design method and a mixing process of a semi-flexible asphalt mixture obtained by stirring under normal temperature conditions. Background technique [0002] The pavement can be divided into asphalt pavement, cement concrete pavement, gravel pavement, block pavement, etc. according to the different materials used in the surface layer. Among them, the asphalt pavement and cement concrete pavement are made of surfaces with high strength, durability and stability. Layer materials can ensure the fast, safe and all-weather traffic of vehicles, and they have been widely used in countries all over the world. In our country, these two pavement forms have also become the main forms of high-grade highway pavement. [0003] Although asphalt pavement and cement concrete pavement are more and more widely used, the defects of these two pa...

AI Technical Summary

Problems solved by technology

The disadvantages of this method mainly include: ①There are many construction procedures, and the construction cannot be completed at one time. It is necessary to pave the asphalt concrete surface layer with large gaps connected first, and then pour the cement slurry on the concrete surface layer with large gaps. Surface Treatment and Wellness

② Subsequent grouting is mainly performed manually, and the effect of grouting is difficult to grasp and the quality is difficult to control

Cement mortar with such a large water-cement ratio tends to produce more drying shrinkage cracks after hardening and setting, thus causing damage to the semi-flexible pavement, and reducing the water-cement ratio will inevitably affect the pouring effect of cement mortar

In order to overcome the above-mentioned defects of poured semi-flexible pavement, can the various raw materials (including cement, water, asphalt, coarse and fine mineral materials, etc.) constituting the semi-flexible asphalt mixture be properly proportioned in the asphalt mixing station? , and according to the reasonable mixing process, the semi-flexible asphalt mixture is directly obtained by one-time mixing (the asphalt mixture with large voids is the matrix, and the cement slurry is filled in the voids of the matrix), and the semi-flexible pavement surface is formed by paving and rolling layers not yet reported

Images