Electro-conductive concrete with nano charcoal black

Abstract

The invention relates to a nano carbon black conductive concrete which is prepared by using silicate cement and sand as the basic material and using nano carbon black as the conductive phase, wherein the constituents of the conducting material comprise (by weight percent) nano carbon black 0.05-3, nano carbon black dispersing agent 0-3, concrete dehydragent 0-0.75.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to nano-carbon black conductive concrete. Background technique [0002] Adding conductive fillers in ordinary concrete, such as carbon fiber, steel fiber, steel slag, graphite, etc., can greatly improve its conductivity. Carbon fibers are fine, chemically stable, and easy to form a conductive network in concrete, but the material cost is high and the molding process is complicated. In the alkaline environment of cement, the surface of steel fiber produces an oxidation passivation layer, which makes the resistivity stability of conductive concrete poor. In the steel slag conductive concrete, when the mass percentage of steel slag accounts for 83.3% of the dry base material, the resistivity of the concrete is only 3000Ω.cm, so the conductivity is poor. In graphite conductive concrete, the graphite content is generally about 20% of the cement mass, and the content is high, and the c...

AI Technical Summary

Problems solved by technology

If the graphite conductive concrete is produced by wet high-pressure extrusion molding, the graphite content can be reduced and the compressive strength can be increased. However, when the 2cm thick plate is manufactured, the pressure for water extrusion can reach 90-120kg / cm 2 , which means that large-tonnage pressure equipment is required for forming large slabs, and the requirements for molds and sealing are also high, which is not conducive to large-area pouring construction on site

The conductive concrete prepared by compounding graphite powder and carbon fiber or steel fiber can improve the mechanical properties of conductive concrete, but there are problems such as complex conductive phase, high cost, and poor stability of resistivity.