Gradient concrete material with small bending deformation and preparation method thereof

Abstract

The invention discloses a gradient concrete material with small bending deformation and a preparation method thereof. During preparation, besides required conventional cement concrete raw materials, the cement concrete also comprises titanium dioxide nanotubes, nano silicon dioxide, a cobalt/carbon nanofiber composite material, carbon nanofibers, chloroprene rubber, polyimide resin, dimethylacetamide, sodium polyacrylate, polyvinyl alcohol, octadecyl methacrylate, methyl cellulose and other performance adjusting materials. A gradient layering preparation form is adopted, namely, a tension layer, a transition layer and a compression layer are prepared in a layering mode. Different performance adjusting materials are added into each layer of concrete material, so that the bending deformation of the material under the long-term load action can be reduced to the greatest extent, the damage of the bending deformation to engineering is reduced, and the concrete has important practical application value.

Description

technical field [0001] The invention relates to the field of cement-based materials, in particular to a gradient concrete material with small bending deformation and a preparation method thereof. Background technique [0002] Concrete beams are the most commonly used bending components. Under continuous compressive stress, they will undergo bending deformation and continuous increase in deflection, which will affect the durability and safety performance of engineering structures. For this reason, the "Code for Design of Concrete Structures" GB50010-2010 has made corresponding provisions on the deflection limit of concrete. Since the bending deflection is significantly affected by the composition and microstructure of cement-based materials, it is of great significance to improve the ability of concrete materials to resist bending deformation from the nano-micron level. [0003] At present, the ways to improve the bending deformation capacity of concrete materials widely use...

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Problems solved by technology

However, the above method has the following problems: 1) With the increase of the cross-sectional area of ​​the beam member, its self-weight will increase significantly, which greatly increases the load-bearing pressure of the structure, especially for some long-span structures with limited weight; 2) ) At present, the technical means to improve the strength of concrete materials are mainly to use a lower water-binder ratio or add a large amount of active cementitious materials, but this will significantly increase the risk of shrinkage cracking, increase the cost of the project, and the increase of cementitious materials will also significantly increase Carbon emissions; 3) There is no solution to the microscopic level that plays a decisive role in the macroscopic performance of cement-based materials, and the role of different parts of the material in bending deformation is not fully utilized.

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