A Construction Method of Fiber Reinforced Lower Sealing Layer of Semi-rigid Base Asphalt Pavement

Abstract

The invention discloses a construction method for a semi-rigid base asphalt pavement fiber-reinforced under-sealed layer. The construction method for the semi-rigid base asphalt pavement fiber-reinforced under-sealed layer mainly comprises the following steps of before construction, performing detecting treatment on the strength of a semi-rigid base and performing surface cleaning on the semi-rigid base and preparing materials needed by the construction; during construction, first simultaneously applying a lower layer emulsified asphalt, a middle layer alkali-free glass fiber and an upper layer emulsified asphalt to the surface of the semi-rigid base with surface cleaned, immediately scattering gravel aggregates to the surface of the upper layer emulsified asphalt, and rolling and compacting the gravel aggregates so that the gravel aggregates can be deeply embedded into the emulsified asphalt; after construction, performing initial maintenance on the construction road section and closing the road section for vehicles; and after the initial maintenance, opening the construction road section to traffic, removing excessive gravels and sweeping the pavement. The invention is advantaged in that the construction method has high construction speed, the tensile strength, fatigue resistance and anti-rutting performance of the constructed semi-rigid asphalt pavement are obviously improved, the construction method can be applied to highway under-sealed layers with various levels, and the construction method also has waterproof effect.

Description

technical field [0001] The invention relates to the field of road construction engineering, in particular to a construction method for a semi-rigid base asphalt pavement fiber-reinforced lower seal. Background technique [0002] Asphalt pavements in my country are mostly semi-rigid base asphalt pavements. Since the semi-rigid base and asphalt surface layer are materials of different properties, it is the key point of this type of pavement to bond well and ensure continuity. In addition, when the asphalt pavement seeps, it will mostly concentrate on the junction of the surface and the base layer, causing the asphalt pavement to be pumped, loose, and damaged by pits. Therefore, there is the appearance of the lower sealing layer. The function of the lower sealing layer is to bond the base layer and the surface layer to prevent water damage between the layers. [0003] At present, the semi-rigid asphalt pavement of expressways in my country generally adopts emulsified asphalt s...

AI Technical Summary

Problems solved by technology

As the semi-rigid base asphalt pavement will inevitably crack, in the rainy season in the south, road surface water will penetrate into the asphalt layer or even the semi-rigid base through these cracks (cracks) to greatly reduce the strength of the asphalt pavement, which will lead to early failure of the asphalt pavement. It is also one of the many reasons why the service life of semi-rigid base asphalt pavement in my country's highways cannot reach the design period

[0005] Therefore, in view of the unsatisfactory waterproof and anti-crack (anti-cutting) performance of the emulsified asphalt slurry seal layer used as the lower seal layer of the semi-rigid base asphalt pavement in my country, it is very necessary to propose a new type of semi-rigid base asphalt The construction method of the lower seal layer of the pavement is to pave a new type of semi-rigid base asphalt pavement, so that it can achieve the purpose of preventing the occurrence of reflection cracks, strengthening the waterproof function and ensuring interlayer bonding, and prolonging the service life of the semi-rigid base asphalt pavement.

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