Cement-based conductive material for existing building strain monitoring and cement-based sensor

A technology of conductive materials and existing buildings, applied in conductive coatings, cement coatings, electric/magnetic solid deformation measurement, etc., can solve the problems of inability to realize strain monitoring, low bond strength of the substrate, narrow detection range, etc., and improve the conductivity Efficiency and stability, extension of bond strength, effects of a wide range of strain measurement

Active Publication Date: 2022-04-12
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a cement-based conductive material and a cement-based sensor for strain monitoring of existing buildings, to solve the problem that the current cement-based sensor needs to be pre-embedded and installed, difficult to replace, low in bonding strength with the substrate, and difficult to detect. The scope is narrow, and strain monitoring cannot be realized for existing buildings

Method used

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  • Cement-based conductive material for existing building strain monitoring and cement-based sensor
  • Cement-based conductive material for existing building strain monitoring and cement-based sensor
  • Cement-based conductive material for existing building strain monitoring and cement-based sensor

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preparation example Construction

[0060] The present invention also provides a preparation method for the cement-based conductive material coating used for strain monitoring of existing buildings, the preparation method comprising the following steps:

[0061] Step 1, taking water-based epoxy resin, conductive filler and water according to the proportion and stirring to form a slurry;

[0062] Step 2, adding the slurry into the cement according to the proportion, stirring until uniformly forming a slurry;

[0063] Step 3: scrape or spray the slurry on the surface of the existing building structure, and harden after curing to form a cement-based conductive material coating.

[0064] The present invention also provides a cement-based sensor, which includes the above cement-based conductive material or the above cement-based conductive material coating, and the cement-based sensor also includes a conductive material installed on the surface of the existing building structure in the area where the coating is appli...

Embodiment 1

[0069] This embodiment provides a cement-based conductive material for strain monitoring of existing buildings. The conductive material specifically includes the following components in mass percentage:

[0070] Anionic water-based epoxy resin 20%, ordinary portland cement 50%, conductive filler 10% (including carbon nanotube 2%, graphene oxide 8%), water 20%.

[0071] The preparation method of cement-based conductive material coating comprises the steps:

[0072] Weigh the required water, water-based epoxy resin, and conductive filler according to the formula ratio and stir until uniformly mixed into a slurry; then slowly add the slurry into the uniformly mixed cement according to the formula ratio, and stir until a uniform slurry; The slurry is scraped or sprayed on the lower surface of the concrete beam and cured for 3 days at a curing temperature of 25°C. After hardening, a cement-based conductive material coating is obtained. The thickness of the cement-based conductive ...

Embodiment 2

[0080] In this embodiment, the specific components of the cement-based conductive material are changed, and the other method steps are the same as those in Embodiment 1, and will not be repeated here.

[0081] The cement-based conductive material specifically includes the following components in mass percentage:

[0082] Cationic water-based epoxy resin 10%, slag portland cement 55%, conductive filler 5% (including graphite 3%, carbon black 2%) and water 30%.

[0083] According to the performance test standard as in Example 1, the cement-based conductive material prepared in this embodiment is tested for performance, and the performance results are as follows:

[0084] The bonding strength between the cement-based coating and the concrete beam is 2.61MPa, the surface has no cracks, no warping, no deformation, and the freeze-thaw durability index of the beam concrete increases from DF=95% to DF=98%. The stress-strain curve of the beam body during the bending fracture process a...

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Abstract

The invention discloses a cement-based conductive material for existing building strain monitoring and a cement-based sensor. The material comprises the following components in percentage by mass: 5-50% of water-borne epoxy resin, 20-80% of cement, 1-20% of conductive filler and 10-50% of water, the cement-based conductive material is brushed or sprayed on the surface of an existing building structure to form a cement-based conductive material coating, and a current loop is formed through a conductive electrode arranged on the surface of a building and a connected monitoring device. When the existing building is subjected to load to generate strain or crack, the strain or crack acts on the surface coating, different current signals are generated, and therefore real-time monitoring is achieved. The monitoring coating is high in signal-to-noise ratio of detection signals, small in relaxation phenomenon, stable in monitoring performance, simple in laying process and high in bonding strength with a building matrix, can be laid on the surface of any special-shaped structure, has good economic benefits and long-term social benefits, and is very wide in application prospect.

Description

technical field [0001] The invention belongs to the technical field of semiconductor devices, and in particular relates to a cement-based conductive material and a cement-based sensor for strain monitoring of existing buildings. Background technique [0002] The global semiconductor industry is generally subdivided into four areas: integrated circuits, optoelectronics, discrete devices, and sensors. Concrete structure health monitoring helps to detect and investigate the early failure of concrete, and is crucial to ensure the safe service of large infrastructure such as bridge and tunnel structures and the prevention and control of major geological disasters. In recent years, a variety of stress and strain sensing monitoring systems based on piezoelectric, piezoresistive, magnetoresistive, optical and acoustic effects have been launched one after another. By embedding sensors in concrete structures, long-term monitoring of structural strain has been initially realized. Amon...

Claims

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Application Information

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IPC IPC(8): C09D1/06C09D163/00C09D5/24C04B41/65C04B41/68G01B7/16
CPCY02W30/91
Inventor 逄博金祖权张云升李梦圆
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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