Large grain size asphalt macadam pavement flexible base layer material

Abstract

The invention discloses a flexible base material for a large-diameter asphalt macadam pavement. An admixture is added to the large-diameter asphalt macadam, wherein the weight percentage of the large-diameter asphalt is 3-3.6%, and the percentage of the admixture is The weight percentage is 0.2-1.1%, and the balance is large-sized gravel. Compared with the prior art, the present invention uses the admixture to replace part of the asphalt, which reduces the construction cost. On the other hand, it can also use industrial waste residues to protect the environment, and at the same time ensure the road performance and mechanical properties of the large-size asphalt macadam flexible base .

Description

Technical field [0001] The invention relates to the field of pavement flexible base materials, in particular to a large-diameter asphalt macadam pavement flexible base material. Background technique [0002] More than 90% of asphalt pavement base materials in my country's existing highways mostly use inorganic binder semi-rigid materials. The characteristic of semi-rigid materials is that the initial investment is small, and the strength and rigidity of the materials will increase with the increase of the curing age; the disadvantage is that the semi-rigid base materials are prone to shrinkage and temperature cracks, and the top surface of the semi-rigid base layer appears After the crack, due to the continuous action of the traffic load, stress concentration is likely to occur on the bottom of the asphalt pavement, which exceeds the tensile strength of the material, causing cracks at the bottom of the asphalt pavement. The cracks are transmitted upward under the action of the tr...

AI Technical Summary

Problems solved by technology

The characteristic of semi-rigid materials is that the initial investment is small, and the strength and stiffness of the material will increase with the growth of the curing age; the defect is that the semi-rigid base material is prone to dry shrinkage and temperature cracks, and the top surface of the semi-rigid base layer appears After the cracks, due to the continuous action of the traffic load, stress concentration is likely to occur on the bottom of the asphalt pavement, which exceeds the tensile strength of the material, resulting in cracks at the bottom of the asphalt pavement layer. and transverse cracks, causing early damage to the pavement, reducing the performance of the pavement and reducing its service life

Therefore, the semi-rigid base is replaced by the flexible base of large-sized asphalt macadam to reduce the occurrence of cracks, but the large-sized asphalt macadam needs asphalt as a binder, and the cost of asphalt is high, which increases the cost.

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