Ultra-high performance cement-based composite material for sensor, sensor and preparation method thereof

Abstract

The invention relates to an ultra-high performance cement-based composite material for a sensor, the sensor and a preparation method thereof, and belongs to the technical field of civil engineering materials, and the ultra-high performance cement-based composite material comprises cement, fly ash, quartz sand, fibers, a water reducing agent, starch gel, water, carbon nanotubes, graphite powder anda surfactant. The tensile strain of the ultra-high-performance cement-based composite material is 3% or above; the defects of brittleness, low tensile strength, poor toughness, easiness in cracking and the like of a common cement-based material are overcome; the strain monitoring range of the manufactured sensor is far larger than that of a sensor made of a common smart cement-based material; thecarbon nano tube and the graphite powder are used as conductive phase materials, the manufacturing cost is low, the sensor is good in compatibility with a concrete structure, excellent in conductivity and smart, stable and reliable in performance, long in service life and easy to manufacture, and due to the addition of the starch gel, shrinkage deformation of the composite material is greatly reduced.

Description

technical field [0001] The invention relates to an ultra-high-performance cement-based composite material used for a sensor, a sensor and a preparation method, and belongs to the technical field of civil engineering materials. Background technique [0002] Concrete structures are widely used in various fields of civil engineering because of their remarkable advantages. Concrete, as a brittle material, has a catastrophic failure, which makes its failure unpredictable, and can easily cause casualties and property losses. Therefore, for concrete structures, structural health monitoring is particularly important. The current common practice is to pre-embed sensors in concrete structures, such as electrostrictive material sensors, optical fiber sensors, etc. The disadvantages of this type of sensors are short life, poor anti-interference ability, high cost, and The survival rate is low. In addition, such materials are generally not highly compatible with concrete structures, t...

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the invention provides a kind of ultra-high performance cement-based composite material for sensor, sensor and preparation method, the tensile strain of the ultra-high-performance cement-based composite material of the present invention is more than 3% (for common It is more than 300 times that of cement-based composite materials), which overcomes the defects of ordinary cement-based materials such as brittleness, low tensile strength, poor toughness, and easy cracking. Carbon nanotubes and graphite powder are used as conductive phase materials, and the cost is low. The sensor has good compatibility with concrete structures, excellent electrical conductivity and sensitivity, stable and reliable performance, long service life, simple production, and starch gel The addition of it greatly reduces the shrinkage deformation of the composite material

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