High-insulativity concrete

Abstract

The invention discloses high-insulativity concrete which is prepared by mixing the following components in percentage by weight: 100 parts of cement, 10 to 70 parts of mineral admixture, 180 to 300 parts of fine aggregate, 200 to 360 parts of coarse aggregate, 5 to 20 parts of redisperable polymer emulsion or emulsion powder, 5 to 15 parts of paraffin, 1 to 5 parts of asbestos fibers, 1 to 5 partsof admixture, 1 to 3 parts of rubber powder and 60 to 80 parts of water. The high-insulativity concrete has high resistivity, good anti-permeability, good freezing resistance, good water resistance and high durability, and meanwhile, has better peaceability, liquidity and consistency; the high-insulativity concrete can be applied to production of a track bed slab and a sleeper in the subway engineering, and can also be used for concrete engineering which needs high insulativity, such as a track plate of a high speed railway ballastless track, a high-voltage wire pole and the like.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a high-insulation concrete. Background technique [0002] At present, my country's subway mainly adopts the DC power supply method. The current starts from the traction substation, passes through the catenary, the locomotive, and returns to the substation through the rail; Insulated, secondly, the environment around the aisle bed is mostly humid, which will cause part of the current on the running rail to flow into the ground through the aisle bed, and flow back to the substation from the underground. This part of the current is stray current; the existence of stray current It will seriously affect the operation of the subway and cause great harm to the surrounding buildings and structures. At the same time, the electrochemical corrosion caused by it will seriously affect the durability and reliability of the reinforced concrete structure. The direction of the medium current is ba...

AI Technical Summary

Problems solved by technology

[0003] The patent application No. 200810046967.8 discloses a high-impedance and high-impermeability concrete material and its preparation method. The patent proposes the composite use of mineral admixtures and insulating polymer concrete; but the electrical parameters of the concrete material in this invention are not significantly improved. Such as resistivity is only 20-30; the patent of patent application No. 200780101006.6 discloses a kind of polymer concrete electric insulation system, and this patent proposes to use the cured epoxy resin composition filled with non-conductive inorganic filler composition earlier; But This invention is mainly used in power transmission and distribution applications, and its preparation technology requirements are relatively high and the raw materials are relatively expensive, and it has not been widely promoted in subway projects and high-speed rail projects; the patent application number 201110024724. The invention patent of ionic and carbonized concrete materials proposes to add muscovite powder on the basis of mixing slag and fly ash; this invention improves the ability to resist stray current by reducing the average diffusion depth of concrete chloride ions in concrete, but compared with ordinary The effect of concrete reduction is not obvious; patent application number 201210092709.X discloses an insulating concrete material and its preparation technology, in which the types of admixtures and admixtures are listed in detail, and the admixtures listed include pulverized coal ash, finely ground slag powder, silica fume, metakaolin, limestone powder, and silica powder, or a mixture of two or more of them; however, the amount of each component is not specific and vague, especially in some areas of China and gradually facing the Coal ash, slag and other admixtures generally have serious problems such as resource shortage; patent application number 201210092706.6 is called an integral insulating concrete track slab and its preparation technology. Impregnation treatment of insulating organic matter, the track slab obtained by this method is not only more cumbersome in the prefabrication process, but also its insulation performance has been greatly improved; but this method is only applied to the concrete components that need to be prefabricated. Bed slab construction did not play a significant role