Composite modified asphalt material applicable to anti-crack layer with pavement structure and preparation method thereof

Abstract

The invention discloses a composite modified asphalt material applicable to an anti-crack layer with a pavement structure and a preparation method of the composite modified asphalt material. The composite modified asphalt comprises the following components by weight: 83.2-87.6 parts of substrate asphalt, 3.1-4.2 parts of thermoplastic styrene butadiene rubber (SBS), 1.3-1.7 parts of powder butadiene styrene rubber (PSBR), 5.3-6.7 parts of desulfuration rubber powder, 1.8-2.5 parts of acetyl tributyl citrate (ATBC), and 0.9-1.7 parts of accelerant, the sum of the parts in weight is 100, the accelerant is rubber filling oil. The composite modified asphalt is applicable to the anti-crack layer with the pavement structure; the anti-crack layer is usually used for a rigid-flexible composite pavement layer for additionally paving asphalt surface layer on a concrete rigid base layer with seams (old concrete pavement), also can be used for semi-rigid base asphalt pavement, so that delay the forming and expanding of reflection cracks can be delayed, the capability of the pavement structure is improved to resist fatigue cracks, the service quality of the pavement structure is improved, and the service life of the pavement structure is prolonged.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and relates to a composite modified asphalt material suitable for anti-cracking layers of pavement structures and a preparation method thereof. Background technique [0002] The early damage of asphalt pavement in our country is relatively serious, and the service life of highway asphalt pavement is often lower than the design service life. It is urgent to improve the durability of road engineering and promote the faster and better development of my country's transportation industry. [0003] In recent years, ordinary cement concrete (PCC), continuous reinforced concrete (CRC), roller compacted concrete (RCC), lean concrete (LCC), ordinary concrete (JPC) with dowel bars in transverse joints, steel fiber reinforced concrete (SFRC) ) and other composite asphalt pavements as rigid bases have developed rapidly, and many early-built roads are facing maintenance and upgrading, especially old c...

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Problems solved by technology

[0004] In order to solve the problem of reflective cracks, the method of setting stress absorbing layer and reinforced materials is mainly adopted at home and abroad at present, but the stress absorbing layer has high requirements on the performance of asphalt materials, and ordinary modified asphalt materials are difficult to meet the requirements, and the stress absorbing The layer is only suitable for road sections where the vertical relative displacement of the joint is less than 0.06mm, and the construction requirements and conditions are also relatively high

Reinforced materials are mainly fiberglass grids, geotextiles, asphalt linoleum, etc. These materials have a certain effect on stress dissipation, but the ability to prevent reflection cracks is limited. If the base layer is uneven, it will cause problems such as insufficient compaction of the asphalt mixture

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