Grounding conductive concrete

Abstract

The composition of grounding conductive concrete includes (wt%) 45-70% of cement, 15-35% of graphite, 8-10% of expansion agent and 7-10% of calcined gypsum. The above-mentioned materials are weighed according to its formula, and placed in stirring machine and fully stirred so as to obtain the invented finished product. The resistivity of its dried state is less than 6 ohm.m, and the resistivity of its wet state is less than or equal to 5 ohm.m, its impulse current withstand delta R% is less than or equal to 20%, and its power-frequency current withstand delta R% is less than or equal to 20%, and the average corrosion rate to metal grounding body when it is buried is less than or equal to 0.05 mm / year, and the average corrosion rate of pure resistance-reducing agent to metal grounding body is less than or equal to 0.03 mm / year.

Description

technical field [0001] The present invention relates to a kind of concrete, more specifically relates to a kind of grounding conductive concrete. Background technique [0002] Concrete is a widely used building material. Concrete impregnated with water or wet soil absorbs water due to the action of capillaries, and has certain ion conductivity. Its resistivity is generally in the range of 0-470Ω.m. The resistivity of wet and dry concrete is very different. The ratio of the two can reach more than 100 times. Therefore, ordinary concrete cannot be used as a grounding conductive material. CN1130604A discloses a conductive concrete composed of graphite powder, chopped carbon fiber, concrete-like strong fiber, concrete water reducer, cement, electrolyte, etc. It is an ideal electric heating material for building electric heating. However, the material formula is relatively complicated, the manufacturing cost is high, and it has a corrosion effect on metals, so it is not suitabl...

AI Technical Summary

Problems solved by technology

However, the material formula is complex, the manufacturing cost is high, and it has a corrosive effect on metals, so it is not suitable for grounding conductive materials.