On-site rapid regeneration and repair method for damage for semi-rigid base of asphalt pavement

Abstract

The invention discloses an on-site rapid regeneration and repair method for damage for a semi-rigid base of asphalt pavement. The method comprises the following steps: (1) determining a treatment range, breaking a whole surface layer and a whole base layer, and crushing the surface layer and the whole base layer through crushing equipment to produce backfill aggregates; 2) mixing the granules with emulsified asphalt; (3) spraying an interface adhesive to the excavation interface; (4) paving the mixed granules to the disease part, leveling and rolling to form a large-gap emulsified asphalt mixture; (5) pouring geopolymer or quick-hardening cement slurry into gaps of the backfill material; and (6), an asphalt surface layer is paved after the curing time is up, and traffic is opened. The repairing method is simple, rapid, small in traffic influence, energy-saving and environment-friendly, the semi-flexible composite material with the elastic modulus equivalent to that of an original pavement semi-rigid base layer is obtained through on-site recycling of an original pavement material, the semi-flexible composite material is bonded with the original pavement material through an interface chemical reaction, and the service life is prolonged.

Description

technical field [0001] The invention relates to a rapid on-site regeneration and repair method for asphalt pavement semi-rigid base disease. Background technique [0002] At present, more than 80% of asphalt pavement bases and subbases in my country use semi-rigid materials. Although the semi-rigid base has high strength and bearing capacity, its strength and modulus will gradually attenuate due to dry-wet, freeze-thaw cycles and fatigue under repeated loads during use. Due to its inherent defects, local damage to semi-rigid bases is inevitable and prone to frequent occurrences, but there are not many repair countermeasures in actual maintenance management. It is usually repaired by excavation, that is, the damaged loose base and subbase are removed, and the base and surface are re-paved after the cushion is repaired. In this maintenance method, on the one hand, the original pavement materials are discarded and cannot be reused, and new materials are paved, resulting in hi...

AI Technical Summary

Problems solved by technology

However, the bonding between the above-mentioned repair materials and the original semi-rigid base is poor, and the interface is easily detached under the load of the vehicle, which causes the subsidence of the repaired base and surface

In addition, the elastic modulus of the above-mentioned materials is much larger than that of the original base material, which may lead to the transverse fracture of the repaired structure itself, which in turn will lead to surface layer diseases, such as cracking and breaking.

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