Cement-based composite material for steel box girder bridge deck, as well as preparation and pavement thereof

Abstract

The invention relates to a cement-based composite material for pavement of a steel box girder bridge deck, as well as a preparation method and a pavement method thereof. The invention aims at providing a lightweight and high-toughness cement-based composite material which is suitable for pavement of larger-span steel box girder bridge decks, and the cement-based composite material comprises the following components in parts by weight: 849-881 parts of cement, 339-425 parts of quartz sand, 215-273 parts of pottery sand, 100-226 parts of fly ash, 30-56 parts of silica fume, 275-295 parts of water, 10-13 parts of water reducing agent, 40-80 parts of steel fiber, 6.5-13 parts of organic fiber and 20-30 parts of epoxy resin. Through material optimization, the durability of a bridge deck paving layer is improved, the overall dead weight is reduced, the cost of a project is simultaneously saved, and the cement-based composite material is suitable for pavement of the larger-span steel box girder bridge decks.

Description

technical field [0001] The invention belongs to the field of material science and engineering, and in particular relates to a cement-based composite material for a steel box girder bridge deck, a preparation method and a paving method thereof. Background technique [0002] Steel box girder bridges are widely used in the construction of bridges and municipal projects at home and abroad because of their significant advantages such as light weight, steel saving, and easy prefabrication and installation. The steel box girder bridge deck pavement scheme of welding shear members + steel mesh + concrete + waterproof bonding layer + surface layer SMA after laying the anti-rust layer with steel plates is only suitable for bridges of about 200m, which greatly limits the large bridges in my country construction innovation. [0003] The traditional solution for large-span steel box girder decks has the following problems: 1) Under the dual effects of repeated traffic loads and high and ...

AI Technical Summary

Problems solved by technology

The steel box girder bridge deck pavement scheme of welding shear members + steel mesh + concrete + waterproof bonding layer + surface layer SMA after laying the anti-rust layer with steel plates is only suitable for bridges of about 200m, which greatly limits the large bridges in my country construction innovation

[0003] The traditional solution for large-span steel box girder decks has the following problems: 1) Under the dual effects of repeated traffic loads and high and low temperature loads, cement concrete is prone to fatigue cracking, which leads to water intrusion and aggravates the corrosion of steel bars, reducing the The service life of the bridge; 2) Due to the large self-weight of ordinary concrete, poor mechanical properties and durability, etc., the elevation of the bridge span is largely limited; 3) Since the concrete of the main girder is completed before the pavement, There is a large difference in working age between the concrete and the post-cast pavement concrete, which causes a difference in shear stress between the first-cast concrete and the post-cast concrete due to different shrinkage values, which causes additional stress to the structure and raises higher requirements for the toughness of the concrete. requirements

However, the use of ordinary lightweight aggregate concrete has problems of insufficient strength and durability, and fatigue cracking is common. At the same time, during the construction vibration of light aggregate concrete, light aggregate, fine aggregate, unhydrated cement particles and cement The density of the slurry is different, and mineral admixtures such as light aggregate and fly ash are prone to float up, resulting in delamination of the pavement material, affecting its wear resistance and service life