A kind of magnetite-intelligent graphite composite phase conductive concrete

Abstract

The present invention is a magnetite-smart graphite composite phase conductive concrete, which includes cement, magnetite sand and graphite, the particle size of the magnetite sand is not greater than 75 μm, and the particle size of the graphite is nanometer or submicron level. In this concrete, magnetite sand and graphite are selected as conductive materials, different ratios of magnetite sand are designed to replace river sand as fine aggregate, and graphite is used as an external additive to improve the electrical conductivity and mechanical properties of concrete. At the same time, ultrasonic vibration wrapping technology is used to organically combine magnetite sand and graphite during preparation, and then alkali excitation technology is used to significantly improve the mechanical and electrical properties of concrete.

Description

technical field [0001] The invention relates to the technical field of conductive concrete, in particular to a magnetite-intelligent graphite composite conductive concrete. Background technique [0002] As a basic engineering material, concrete's development direction is mainly to improve its flexural and compressive strength and to make it "smart" by adding other materials. A certain amount of conductive phase materials can be mixed into concrete to make conductive concrete. Conductive concrete is a composite material with many characteristics or functions such as electrical conductivity, electric heating, and electromagnetic shielding. Because of its ability to sense and convert heat and electricity. It is a new type of intelligent multi-phase self-compacting concrete. [0003] Graphite has the advantages of wide material sources, low price, large heat capacity, strong electrical conductivity, inert material, etc., and is a good conductive material. Adding it to concret...

AI Technical Summary

Problems solved by technology

However, if the amount of graphite is too small, a good conductive network cannot be formed, and if the amount of graphite is too large, the strength of the component will be reduced.

Moreover, the density of graphite is low, and it usually gathers or floats on the concrete bleeding surface, so that it cannot be evenly distributed in the concrete even by stirring.

[0004] For example, the Chinese patent No. ZL201910108836.6 discloses a highly conductive graphite concrete. The concrete uses flake graphite with a particle size of 100 mesh as the conductive material. The amount of cement and graphite powder added is almost equal, and the resistance is reduced by adding a large amount of graphite. Value, combined with water-retaining components to ensure its mechanical properties and slump, although it can improve the conductivity of concrete, but its resistivity is about 9Ωm, and the 28-day compressive strength is about 30.5MPa. Excessive mixing of graphite will lead to concrete Strength reduction and other issues, and the graphite in this patent cannot be evenly distributed in the components during the concrete preparation process, and the comprehensive performance needs to be improved

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