Method for determining asphalt consumption of macadam seal in embedded ultra-thin wearing layer

Abstract

The invention discloses a method for determining asphalt consumption of a macadam seal in an embedded ultra-thin wearing layer. The method is characterized by comprising the following steps: forming an embedded ultra-thin wearing layer track plate test piece consisting of macadam seals with different asphalt consumption, and drawing concentric circles by taking the center of the embedded ultra-thin wearing layer track plate as a circle center; taking fine sands with the same volume, flatly paving the fine sands in the concentric circles from inside to outside, measuring the diameter of the flatly paved circle of the fine sands on the track plate test piece, and taking the diameter obtained by flatly paving the embedded ultra-thin wearing layer track plate test piece with the gravel sealinglayer asphalt consumption of 0kg / m<2> as a standard diameter; performing calculating to obtain a construction depth attenuation coefficient IA by adopting the measured diameter of the tiled circle and the standard diameter; and determining the asphalt consumption of the macadam seal in the embedded asphalt concrete based on the relationship between the asphalt consumption of the macadam seal andthe IA. Compared with the prior art, the method is simple, feasible and more accurate.

Description

technical field [0001] The invention belongs to the technical field of road maintenance, and relates to an evaluation method for oil flooding of an embedded ultra-thin wearing layer and a method for determining the amount of asphalt for a gravel sealing layer. Background technique [0002] Thin layer overlay is a traditional preventive maintenance method adopted very early, which is to add a layer of hot asphalt mixture with a thickness of no more than 2.5cm on the original road surface. Thin-layer overlay technology can effectively prevent the deteriorating road surface from continuing to deteriorate, improve road surface smoothness and anti-skid resistance, have a certain reinforcing effect on the road surface, improve driving quality, correct surface defects, and improve safety features. However, the mechanical characteristics of the thin-layer pavement system are fundamentally different from those of traditional thick pavement layers: the thinner the pavement layer, the ...

AI Technical Summary

Problems solved by technology

For the embedded ultra-thin wearing layer structure, in order to ensure that the embedded ultra-thin wearing layer structure has a good embedding effect, it can be seen that the gravel seal layer in the embedded ultra-thin wearing layer structure needs to have enough bitumen to make it When filling the voids of asphalt concrete with large voids, the filling height should reach 2 / 3 of the thickness of the asphalt concrete, but too much asphalt will cause oil flooding on the surface. Therefore, if it is accurately determined that the embedded ultra-thin wear layer structure The amount of asphalt used in the gravel seal is the key technical problem faced by this technology

Claim 5 of the existing patent "Embedded ultra-thin wearing layer for road upper layer and its construction method" (patent number: ZL201710859523.5) is based on the void ratio of large-void asphalt concrete and the height of the asphalt pan. The formula is used to determine the amount of asphalt per unit area of ​​the gravel seal layer. This theory cannot accurately distinguish the connected voids and non-connected voids in the wear layer with large voids. However, the non-connected voids will not be filled with asphalt during the asphalt flooding process. Therefore, In the course of further research, the inventor found that: the existence of non-connected voids in the wear layer with large voids will cause the theoretical calculation results to be too large, and oil flooding will occasionally occur during actual implementation

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