Concrete modifier and concrete

Abstract

The invention provides a concrete modifier, comprising 10-80 weight parts of carbon nanotubes, 2-7 weight parts of cement and / or a cement raw material and 5-10 weight parts of an acrylic emulsion. Compared with graphite powder modifier and steel fiber modifier in the prior art, the invention has the following advantages: first, the invention uses the carbon nanotubes as the main electrical property modifier, which can realize good electrical performance improvement with small addition amount, and has little impact on mechanical properties and impulse current withstand performance of the concrete; second, after the reaction, the acrylic emulsion can gradually produce acrylic resin to fill gaps within the concrete, improve impermeability of the concrete, and high tenacity of the acrylic resin endows the conductive concrete with strong mechanical properties; and third, addition of the cement and / or the cement main material into the modifier can improve dispersion of the carbon nanotubes and compatibility of the carbon nanotubes with the main material of the concrete.

Description

Technical field [0001] The invention belongs to the technical field of building materials, and particularly relates to a concrete modifier and concrete. Background technique [0002] Concrete has a history of more than 100 years, and it has become the most widely used and most used building material in the field of civil engineering worldwide. Under normal circumstances, ordinary concrete has a high resistivity and is a poor conductor of electricity. In the case of conductive concrete, a certain amount of conductive component material is added to ordinary concrete. It is a new type of cement-based composite material that is mixed and condensed by cementing materials, conductive materials, dielectric aggregates and water in a certain proportion. New concrete with specified electrical properties and certain mechanical properties. Conductive concrete not only has the characteristics of structural materials, but also has electrical conductivity and smart characteristics, making con...

AI Technical Summary

Problems solved by technology

[0005] Graphite has good electrical conductivity (the carbon content is greater than 80%, and its resistivity is usually not greater than 0.5Ω·cm). Compared with copper powder, iron powder, aluminum powder and other metal powders, it has stable chemical properties, acid and alkali resistance, Good oxidation resistance and other advantages, but the graphite powder needs to be mixed with a higher amount to form an interconnected conductive network in the concrete matrix, and the water demand of the graphite powder is very large, and the water consumption of the concrete mixture needs to be greatly increased. As a result, the strength of concrete decreases rapidly with the increase of graphite powder content.

[0006] Steel fibers have the advantages of improving the mechanical properties of concrete such as tensile, bending, and shearing resistance. At the same time, as metals, they can also perform their conductive functions. However, as time goes by, due to the high alkaline environment of steel fiber concrete, metal It is easy to produce a passivation film, resulting in a significant increase in the resistivity of the concrete