Macadam seal oil flooding degree testing method and asphalt consumption determining method

Abstract

The invention discloses a macadam seal oil flooding degree testing method. The method comprises steps of: preparing a macadam seal sample formed by an asphalt patch, the width of the macadam seal sample being the same as the width of a tire of the rut experimental device, the thickness of the asphalt patch linearly changing along the length direction of the macadam seal sample, and different thicknesses corresponding to different asphalt contents; covering the surface of the macadam seal sample with a light-colored composite fabric, and then carrying out a track test; collecting a lower surface image of the composite fabric after the rut test is finished; calculating the black area proportions of a plurality of regions which are in contact with the broken stone seal sample and are equallydivided along the length direction of the broken stone seal sample; and characterizing the oil flooding degree of the macadam seal under the average asphalt content corresponding to the correspondingregion by using the black area ratio, thereby obtaining a plurality of quantitative indexes of the oil flooding degree of the macadam seal under different asphalt contents. The invention further discloses an asphalt consumption determining method. 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 engineering testing, and in particular relates to a method for testing the oil flooding degree of a gravel seal layer. Background technique [0002] The gravel seal is a kind of asphalt gravel wear layer formed by sprinkling asphalt and gravel on the old road surface or the base layer, rolling it in time with rubber rollers and rolling it naturally after opening to traffic. It is a commonly used preventive maintenance technology for flexible pavement . However, during its use, the asphalt in the gravel seal will rise from the interior to the surface of the gravel seal, causing too much asphalt on the surface of the gravel seal, resulting in oil flooding. Oil flooding will reduce the skid resistance of the road surface, shorten the service life of the road surface, and pose a serious threat to driving safety. Therefore, how to determine the maximum amount of asphalt in the design stage of the crushe...

AI Technical Summary

Problems solved by technology

In addition, when making gravel seals on rut slab specimens, it is more convenient to make specimens if emulsified asphalt and other binders with fluidity under normal temperature conditions are selected, but if the gravel seals The binder in the layer is modified asphalt such as rubber asphalt, which has certain fluidity at high temperature. Then, at room temperature, due to the rapid temperature drop of the asphalt, the production area of ​​the sealing layer is large, and it is difficult to make a 30cm×30cm gravel sealing layer. High, very low success rate

[0004] At present, in physical projects, the commonly used asphalt dosage range for gravel seals is 0.5kg / m 2 ~3.5kg / m 2 , if the friction coefficient is used to evaluate the degree of oil spillage on the road surface, the degree of oil spillage of all asphalt dosages within this range cannot be detected at a single time. This method is not the best method due to its high test intensity and large investment.

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