Super-tough and low-dry shrinkage cement-based material steel bridge deck pavement structure and construction method thereof

Abstract

The invention discloses a super-tough and low-dry shrinkage cement-based material steel bridge deck pavement structure and a construction method thereof. The super-tough and low-dry shrinkage cement-based material steel bridge deck pavement structure is composed of, from bottom to top, a cement-based material base layer, a waterproof adhesion layer and an asphalt surface layer, wherein the cement-based material base layer is connected with a steel bridge faceplate through shear connectors, provided with 1-2 layers of meshes in the height direction and formed by mixing cement, coal ash, silicapowder, swelling agent, water reducer, fine sand, fiber and water, and the water-based material base layer achieves a 28-day axial compressive strength R higher than or equal to 70 MPa, an ultimate tensile strain delta higher than or equal to 1.2%, a corresponding maximum crack width delta smaller than or equal to 0.2 mm and a 28-day dry shrinkage s lower than or equal to 300 mu epsilon and is cold-mixed in situ and maintained at normal temperature; the waterproof adhesion layer is made of high-viscosity asphalt, has a 60 DEG C dynamic viscosity higher than or equal to 60000 Pa*s, achieves good adhesion performance and obtains functions of being waterproof, preventing crack expansion and upward reflection of the water-based material base layer and the like. The super-tough and low-dry shrinkage cement-based material steel bridge deck pavement structure has the advantages of being high in toughness, good in temperature stability and durability, convenient to construct, high in economical efficiency and the like.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and relates to a super-toughness low-shrinkage cement-based material steel bridge deck pavement structure and a construction method thereof. Background technique [0002] Since its inception in the 1950s, orthotropic steel bridge decks have become a widely used bridge deck structure for large and medium-span steel bridges at home and abroad due to their advantages of light weight and fast construction speed. However, in the process of use, it was found that many steel deck pavements have serious cracks, local wrapping, rutting and other defects. The main reasons are: (1) The structural characteristics of orthotropic steel decks determine their local stiffness (2) Commonly used asphalt pavement materials have low stiffness, strong temperature sensitivity, and become soft at high temperatures. [0003] Generally speaking, engineers can reduce or slow down the occurrence of diseases by o...

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Problems solved by technology

[0006] In view of this, the object of the present invention is to provide a super-toughness and low drying shrinkage cement-based material steel bridge deck pavement structure with high toughness, good temperature stability, good durability, convenient construction and good economy, and its construction method, Solve the problems of many deck pavement defects and short service life of the current steel bridge

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