Cold-regenerated emulsified asphalt mixture and method of cold-regenerated emulsified asphalt mixture for road surface reconstruction

Abstract

The invention provides a cold-regenerated emulsified asphalt mixture and a method of the cold-regenerated emulsified asphalt mixture for road surface reconstruction. In the method, the damage condition of a structural layer below a surface layer is measured on the spot, and then quantitative evaluation is carried out on the bearing capacity so as to obtain actual mechanics and structural parameters; the production of the regenerated asphalt mixture is carried out in a cold mixing factory after milling materials on the asphalt surface layer of an old road, cement, emulsified asphalt and water mixed together; the regenerated asphalt mixture passes the forming test piece detection; the mixture obtained by the above steps is used for a to-be-reconstructed road surface structure, including the laying of a roadbed, a base layer and the surface layer. Moreover, the cold-regenerated asphalt mixture used for the above method has the following characteristics: mineral materials which are mainly composed of the milling materials of the asphalt surface layer of the old road, asphalt cementing materials and residual gaps form a multi-phase disperse system structure with a space network structure; the material property is granular; and the mechanics strength is reached by the cohesive force and the inner frictional resistance of the asphalt mixture.

Description

technical field [0001] The invention relates to road engineering, especially cold recycled emulsified asphalt mixture and its method for road reconstruction. Background technique [0002] The reconstruction and repair of semi-rigid base asphalt pavement will produce a large amount of old asphalt pavement materials. From the perspective of protecting the environment and saving resources, this part of the old asphalt pavement materials should be fully recycled. According to the analysis of regeneration technology, cold regeneration of emulsified asphalt is more suitable for this engineering situation. Since the semi-rigid base of about 50% of the road section is not damaged, the old asphalt pavement material can be used as the upper base after regeneration. Although many areas at home and abroad are experimenting, researching and analyzing the recycling of old asphalt pavement materials, there are still some key technical issues that need to be further studied in practical en...

AI Technical Summary

Problems solved by technology

However, after years of use, this pavement has also exposed some defects and deficiencies that cannot be ignored: ① shrinkage cracking of the semi-rigid base and the resulting reflection cracks of the asphalt surface; ② fatigue damage of the semi-rigid base, due to the semi-rigid base The design idea of ​​the rigid base asphalt pavement is based on the base as a load-bearing layer, and the fatigue damage of the base is equal to the destruction of the entire pavement structure; ③The strength and modulus of the semi-rigid base are too large

These defects and deficiencies, as well as the substantial increase in traffic flow and serious overloading problems have led to a large number of expressway asphalt pavements with a design life of 15 years, which have been open to traffic for about 7 to 8 years, and at most 10 years, there have been different degrees of damage. Overhaul is necessary due to early damage such as grid cracks, potholes, ruts, etc.

When this kind of pavement is overhauled, the asphalt surface layer is first milled off, and the milling of the surface layer brings two problems that must be solved: 1. The problem of judging the bearing capacity of the pavement structure below the asphalt surface layer to determine these Utilization of pavement structure layer; 2. Disposal of recycled asphalt pavement material RAP (reclaimed asphalt pavement)

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