Construction method of large-particle-size cement regenerated base pavement structure

Abstract

The invention relates to a construction method of a large-particle-size cement regenerated base pavement structure. The problems that an existing pavement has the defect of reflection cracks and is low in heavy load resistance, and a flexible base layer is prone to net cracks and sinking are solved. According to the technical scheme, the building material comprises a main aggregate, a filling material and a caulking material. The method comprises the following steps: paving a main aggregate, rolling the main aggregate, paving a filling material, uniformly mixing the filling material and the main aggregate, conducting rolling, spreading a caulking material, and conducting rolling and preserving for 7 days. The rebound modulus is about 1200 MPa, the main aggregate is large-particle-size broken stone, the nominal particle size of the main aggregate is 53-73 mm or 37.5-63 mm, the filling material and the caulking material adopt an on-site cement cold recycled asphalt surface layer milling material, the cement cold recycled asphalt surface layer milling material is formed by mixing an old road asphalt pavement structure layer milling material, cement and water in regeneration equipment, the maximum particle size of the cement cold recycled asphalt surface layer milling material is smaller than 16 mm, the continuous grading curve requirement is met, the cement dosage range is 5-12%, and the 7d unconfined compressive strength representative value is not lower than 3 Mpa.

Description

technical field [0001] The invention relates to the technical field of highway engineering, in particular to a construction method of a large particle size cement regenerated base course pavement structure. Background technique [0002] In the treatment of large and medium-sized highway repair and maintenance projects in my country, milling and planing asphalt surface layers are often used to excavate and replace the original base and subbase, and to reinforce and reinforce them. It is determined whether to add a new base according to the design strength, and then re-pave the surface. This kind of structural maintenance plan needs to discard a large amount of milling materials, causing environmental pollution, and the design of the new base is often considered to be more water-stable. Although the water-stable base has high strength, high modulus, and strong board performance, its temperature shrinkage, Dry shrinkage is large, easy to crack, and has no self-healing ability, so...

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Problems solved by technology

[0005] In view of this, in order to solve the defects of reflective cracks existing in the existing pavement, the problem of low heavy load resistance, and the flexible base is prone to network cracking and sinking, the present invention provides a construction method for the pavement structure of the large particle size cement regenerated base

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