A method for determining the amount of asphalt in the gravel seal layer in the embedded ultra-thin wear layer

Abstract

The invention discloses a method for determining the amount of asphalt in a gravel seal in an embedded ultra-thin wearing layer, which is characterized in that: the embedded ultra-thin wearing layer rut plate test piece is composed of crushed stone seals with different amounts of shaped asphalt. The center of the rut plate with embedded ultra-thin wear layer is the center of the circle and draw a concentric circle; take the same volume of fine sand, spread the fine sand in the concentric circle from the inside to the outside, and measure the circle of the fine sand on the rut plate specimen. Diameter, the amount of asphalt used in the gravel seal layer is 0kg / m 2 The diameter obtained by tiling on the embedded ultra-thin wearing layer rut plate specimen is the standard diameter; the attenuation coefficient I of the structural depth is calculated by using the measured tiling circle diameter and standard diameter A ; Based on the amount of asphalt in the gravel seal layer and I A The relationship between determines the amount of asphalt used for the gravel seal in embedded asphalt concrete. Compared with the prior art, the present invention is simple, easy to implement 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

Images