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Piezoresistive effect concrete with high sensitivity and preparation method thereof

A high-sensitivity, concrete technology, applied in the field of civil engineering, can solve the problems of high price and high concrete production cost, and achieve the effects of high sensitivity, maintaining stability and repeatability, and convenient forming.

Inactive Publication Date: 2020-12-01
YANCHENG INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the material is expensive, making concrete too expensive to produce

Method used

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  • Piezoresistive effect concrete with high sensitivity and preparation method thereof
  • Piezoresistive effect concrete with high sensitivity and preparation method thereof
  • Piezoresistive effect concrete with high sensitivity and preparation method thereof

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Embodiment Construction

[0048] The present invention will be further described below in conjunction with specific embodiments and accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0049] 1.1 Material and performance requirements:

[0050] Cement: P·II 42.5 grade Portland cement, the quality meets the requirements of the GB175-2007 specification of "General Portland Cement".

[0051] The performance index of silica fume is as follows: total alkalinity 2 Content>85%, activity index>105%, specific surface area is 15m 2 / g, water absorption <125%, moisture content <3.0%.

[0052] The performance indicators of graphene nanosheets (NGPs) are as follows: purity >99.5%, diameter 5-10µm, thickness 0.4-20nm, number of layers 1-5, density 0.23g / cm 3 , volume resistivity 4×10 -4 Ω·cm.

[0053] Carbon fiber (CF) performance indicators are as follows: diamete...

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Abstract

The invention provides piezoresistive effect concrete with high sensitivity. The piezoresistive effect concrete is prepared by taking carbon fibers, steel fibers, multi-walled carbon nanotubes and graphene nanosheets as functional fillers, and a conductive network is perfected through co-doping of a plurality of functional fillers, so that the piezoresistive response sensitivity is improved. Basedon 100 parts by weight of Portland cement, the piezoresistive effect concrete with high sensitivity further comprises 0.6-1.8 parts of carbon fibers, 2-6 parts of steel fibers, 0.25-1 part of multi-walled carbon nanotubes and 0-0.05 part of graphene nanosheets. By changing the mixing amount of the filler, a series of piezoresistive effect concrete materials are provided, and the resistivity change rate is not less than 4% under the load effect of at least 16 MPa. The resistivity change rate can be kept stable and repeatable at the loading rate of 5, 10, 20 and 30 KN / min.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a high-sensitivity pressure-resistance effect concrete. The present invention further relates to a method for preparing said concrete. Background technique [0002] At present, with the enlargement of buildings and infrastructure and the complexity of the service environment, people's requirements for materials are developing in the direction of multi-function and intelligence. A development trend. In the field of civil engineering, the current commonly used structural monitoring method is to install sensors in the structure, the mechanical changes received by the sensors are converted into electrical signals, and then the structural health status is obtained through electrical signal analysis. Commonly used sensors include strain sensors, strain gauges, optical fiber etc. However, this type of sensor has a complex structure, poor compatibility with cement-based mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/94
CPCC04B28/04C04B2111/94C04B2201/50C04B14/386C04B14/48C04B14/026C04B18/146C04B2103/302C04B2103/408C04B14/02C04B14/06
Inventor 孙亚飞周天舒吴发红彭月月刘宏伟李隽
Owner YANCHENG INST OF TECH
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