Interface adhesive material, white-to-black overlay structure based on material and construction process of overlay structure

Abstract

The invention relates to an interface adhesive material, a white-to-black overlay structure based on the material and a construction process of the overlay structure. The interface adhesive material comprises the following components in parts by mass: 20 to 60 parts of dry powder, 100 parts of modified emulsified asphalt, 20 to 40 parts of silicone rubber emulsion and 10 to 30 parts of a polyurethane modified epoxy resin material. The interface adhesive material has excellent adhesiveness, waterproofness and ultimate deformation capability, is moderate in elastic modulus, and can firmly bond an asphalt concrete layer with a cement concrete layer to form an integrally stressed composite pavement structure; when the asphalt concrete layer is horizontally pushed, accompanying deformation of an interface adhesive layer consumes partial energy, so that stripping caused by excess relative slip of the asphalt concrete layer is avoided; meanwhile, the elastic modulus of the interface adhesive layer is moderate and between the elastic modulus of the asphalt concrete layer and the elastic modulus of the cement concrete layer, so that the transitional effect can be achieved between the asphalt concrete layer and the cement concrete layer, the stress generated by traffic loads can be uniformly transferred, and the stress concentration phenomenon is effectively solved.

Description

【Technical field】 [0001] The invention belongs to the field of road overlay reconstruction, and in particular relates to an interface bonding material, a white-to-black overlay structure based on the material and a construction process thereof. 【Background technique】 [0002] Cement concrete pavement is widely used due to its high strength, good stability, strong durability, and low maintenance cost. In 2014, among the paved roads in my country, asphalt concrete pavement accounted for 19% of the total road mileage. , Cement concrete accounts for 38%, and it is still the main pavement structure of my country's highways. However, due to the large traffic flow of vehicles, the phenomenon of overloading and overloading is common, and the cement concrete is brittle and easy to shrink and crack, etc., resulting in cracks, mud pumping, holes and misalignment on the cement concrete pavement, which seriously affect the service life of the cement concrete pavement. and driving comfort...

AI Technical Summary

Problems solved by technology

[0003] The cement concrete pavement with asphalt concrete layer involves two types of pavement structures: rigid and flexible. Cement concrete and asphalt concrete have different material properties such as elastic modulus, linear expansion coefficient, and Poisson's ratio. When the temperature changes, due to the Due to the difference in performance, the interface between the asphalt concrete layer and the old cement concrete layer is prone to tensile stress. When the interlayer cohesion is low and less than the tensile stress, relative slippage will occur between the two layers, and even lead to asphalt concrete The layer is detached from the cement concrete layer, causing the road surface to be stressed from the original whole to two thin layers, and the road performance of the road surface is deteriorated, making it difficult to maintain a good working condition; in addition, due to the joints in the old cement concrete pavement, the asphalt The concrete layer is prone to reflective cracks at these positions, and the road surface water will seep into the interlayer through the cracks. When the waterproof performance of the interface between the layers is poor, the water will further invade the base layer. Under the action of the vehicle load, it will not only wash the base layer , causing pumping damage, and also wet and soft foundation, which reduces the bearing capacity of the road surface

[0004] When the car starts, brakes suddenly or drives on a sloped road, the horizontal thrust of the wheels on the asphalt concrete layer is relatively large, which easily causes the asphalt surface layer to slide in the horizontal direction, while the cement concrete pavement, as a rigid structure, cannot synchronously produce sliding Displacement, unable to resist horizontal thrust with the asphalt pavement as an integral structure, resulting in overloading of a single layer of asphalt pavement, and finally causing the pavement to suffer from diseases such as shifting, loosening and hugging after overlaying

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