On-site construction method of cold recycling asphalt pavement

Abstract

The invention discloses an on-site construction method of a cold recycling asphalt pavement. The on-site construction method comprises the following process steps: digging out used materials of the asphalt pavement by a pavement milling and planing device; performing continuous circulating crushing and screening on the used materials of the asphalt pavement by a crushing and screening device; placing the crushed and screened used materials of the asphalt pavement into a finished product hopper, mixing emulsified asphalt with water in a proportion of 1: 1, blending with the used materials of the asphalt pavement in the finished product hopper, then adding a mixture of cement and ore powder to form an asphalt mixture; laying the asphalt mixture on a base layer of the pavement in a slow, uniform and continuous way, completing the compaction of a recycling asphalt mixture through three rolling stages, namely initial rolling, re-rolling and final rolling; and standing and curing the rolled base layer of the cold recycling asphalt mixture for 10-14 days. According to the method disclosed by the invention, the proportion of one-time cold recycling is high, the economic benefits are higher, the problem of secondary pollution is avoided, and the method is a green and environment-friendly preparation method.

Description

technical field [0001] The invention relates to a regeneration method of asphalt pavement, in particular to a field construction method of cold recycled asphalt pavement. Background technique [0002] As a main pavement material, the quality of asphalt directly affects the service performance and service performance of the pavement. However, the quality and quantity of asphalt currently produced in the heavy traffic pavement in China are far from meeting the actual needs, so the modified asphalt technology is becoming more and more important. more people's attention. [0003] At present, the life of asphalt pavement in my country is short. To investigate its root cause, most of my country's high-grade asphalt concrete pavements use two-layer semi-rigid bases with a total of 38-40 cm. The asphalt concrete surface is generally 15-18 cm, the so-called "strong base and thin surface". This kind of pavement structure is prone to reflective cracks in the asphalt surface layer; it ...

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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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