Conductive mortar, high-conductivity conductive cement-based material and preparation method of conductive mortar and high-conductivity conductive cement-based material

Abstract

The invention relates to conductive mortar, a high-conductivity conductive cement-based material and a preparation method thereof, and the conductive mortar is prepared from the following raw materials in percentage by mass: 36-41% of cement, 1-3% of a curing agent, 1-3% of a curing agent, 1-3% of a curing agent, 1-3% of a curing agent and the balance of water. 19-20% of water; 0.5-1% of a water reducing agent; 0.5-3% of graphite; 0.1 to 0.5 percent of carbon fiber; 7-8% of silica fume; 30-32% of machine-made sand; 0.1%-0.2% of a carbon fiber dispersing agent and 0.01%-0.08% of a defoaming agent; wherein the particle size of the graphite is 800-1200 meshes. According to the invention, the graphite powder with low doping amount and small particle size is co-doped with the carbon fiber with low doping amount, and the silica fume is used cooperatively, so that the graphite powder can be uniformly dispersed in a mortar system, and the conductive performance of the conductive mortar can be remarkably improved by matching with the carbon fiber uniformly dispersed in the system, and meanwhile, the filling effect of the graphite powder with small particle size is utilized to improve the conductivity of the conductive mortar. The high-strength cement-based material is obtained.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a conductive mortar, a high-conductivity conductive cement-based material and a preparation method thereof. Background technique [0002] Cement concrete has been widely used in various aspects of construction, transportation and urban construction because of its low price, excellent plasticity and reliable mechanical properties. In the traditional sense, cement concrete is an insulating material, and the resistivities of saturated and dry concrete are 10 6 Ω·cm and 10 9 Ω·cm. As early as the 1930s, scientists began to study how to improve the electrical conductivity of cement concrete materials and developed conductive concrete. So far, conductive concrete has been widely used in industrial anti-static, electromagnetic interference shielding, power equipment grounding engineering, circuit breaker ground closing resistors, building lightning protection equipment, ...

AI Technical Summary

Problems solved by technology

However, the existing conductive phase materials have their own defects in the use process: the corrosion of steel fibers in cement-based materials is an important factor hindering its development; the expensive price of carbon nanotubes and carbon nanofibers hinders the development of industrialization. It is prohibitive; the addition of pure carbon black, graphite and other powder materials will cause high water demand of cement-based materials, and a large amount of admixture will have a negative impact on the strength of cement-based materials, such as Shi Yantian, Zhang Juncai, etc. Preparation and Performance" mentioned that the compressive strength of concrete mixed with 10% graphite was reduced by 77%; Junbo Sun et al. published the article "The effect of graphite and slag on electrical and mechanical properties of electrically conductive cementitious composites" in Construction and Building Materials It is mentioned that 6% graphite content reduces the flexural strength of conductive mortar by 34%; but if the graphite content is less, it will affect the conductivity of cement-based materials

Although the leveling layer has electrical conductivity, its electrical conductivity is poor, the resistivity is as low as 24Ω·cm, the highest tensile strength is only 3.4MPa, and the amount of graphite powder is more than twice that of cement, so the cost is high

Images