Pressure-sensitive cement-base composite material

Abstract

The present invention discloses a pressed cement composite material, which relates to a cement composite material; the present invention is to solve the shortcoming in the existing pressed cement material that: the sense ability for the force-electricity coupling effect is much lower, the existing method is influenced by the humidity greatly, and the base polarization is easy to influence the test of the electricity signal. The present invention consists of a function component and cement material; the function component is a nickel powder or a mixture between the nickel powder and one or more than one material including carbon cellulose, carbon, graphite and steel residual; the cement material is a glue material or a composite material between the glue material and the bone material; thereinto, the function component occupies between 1 percent and 80 percent in the total weight; and the rested is the cement material. The sense ability of the pressed cement composite material in the present invention is much higher; the sensitivity can reach to more than hundred or thousand, which is higher than the sensitivity of the existing pressed cement composite material with the function component including carbon cellulose, carbon and steel residual and so on. Besides, the force-electricity coupling effect for the material is much smaller by the humidity; the test of the electricity signal is not easy to be influenced by the base polarization.

Description

technical field [0001] The invention relates to a cement-based composite material. Background technique [0002] In 1989, Professor D.D.L.Chung of the United States discovered that after traditional cement-based materials were mixed with chopped carbon fibers, the volume resistance of the carbon fiber cement-based composites produced would change regularly under the action of force field or temperature field, so carbon fiber Cement-based materials can perceive their own stress, strain, damage and temperature through changes in resistivity, that is, they have force-electricity coupling effects and thermo-electricity coupling effects (force-electricity coupling effects and thermo-electricity coupling effects are collectively referred to as sensitivity) . Through the research, it is also found that the combination of functional components (one or several kinds of carbon black, steel slag and nano particles) and cement-based materials also has the mechanical-electrical coupling...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a pressure-sensitive cement-based composite material in order to solve the defects of the existing pressure-sensitive cement-based materials, such as low sensitivity of the force-electric coupling effect, great influence by humidity, and easy influence of matrix polarization on electrical signal testing.

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