Cold recycled asphalt mixture processing method for pavement spread

Abstract

A cold recycled asphalt mixture processing method for pavement spread comprises the steps of: (1) smashing, sieving and storing old bituminous pavement material RAP; (2) transporting the RAP material a batching plant, batching, intensively smashing and sieving, and immediately transporting the batched recycled cold material to the construction site; (3) transporting and spreading the cold recycled asphalt mixture; (4) compacting the cold recycled asphalt mixture, which is finished through three rolling compaction steps of first compacting, second compacting and final compacting; and (5) curing to be completed. The invention makes the maximum use of the old pavement structure and material, and realizes the best integration of social benefit, economic benefit and environmentally-friendly benefit.

Description

technical field [0001] The invention relates to road engineering, in particular to a treatment method for cold recycled asphalt mixture used for road paving. 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)