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ECT sensor for monitoring moisture transmission inside concrete member

A concrete specimen and concrete technology, applied in the field of ECT sensors, can solve the problems of inability to visualize concrete moisture transmission, inability to quantitatively monitor concrete moisture content, complex structure, etc., to achieve non-destructive monitoring, improve data acquisition speed, and simplify size and quantity. Effect

Pending Publication Date: 2019-11-19
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of complex structure, inability to quantitatively monitor the moisture content inside the concrete, and the inability to visually monitor the moisture transmission inside the concrete existing in the prior art, and seek to design an ECT sensor for monitoring the moisture transmission inside the concrete member, so as to realize the secondary function of cracked concrete. Unsaturated moisture transport imaging, real-time tracking of moisture transport in concrete

Method used

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  • ECT sensor for monitoring moisture transmission inside concrete member
  • ECT sensor for monitoring moisture transmission inside concrete member
  • ECT sensor for monitoring moisture transmission inside concrete member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The main structure of the ECT sensor for monitoring the moisture transmission inside the concrete member involved in this embodiment includes a concrete specimen 1, a water storage tank 2, an insulating pipe 3, an electrode plate 4, a radial shielding electrode 5, an insulating layer 6, a clamp 7, and a threaded rod 8. Nut 9, connector 10, through hole 11, iron sheet 12, top plate 13, bottom plate 14, pad 15, lead hole 16, electrode lead 17, fixing hole 18 and buttress 19; concrete specimen with cylindrical structure A water storage tank 2 is pasted on the side surface of 1, and an insulating tube 3 is laid on the side surface of the concrete specimen 1 where the water storage tank 2 is not pasted. There is a radial shielding electrode 5, the outer periphery of the electrode plate 4 and the radial shielding electrode 5 is covered with an insulating layer 6, the outer periphery of the insulating layer 6 is provided with a clamp 7, the clamp 7 is provided with an opening, ...

Embodiment 2

[0026] The process of performing two-dimensional unsaturated moisture transmission imaging inside cracked concrete with the ECT sensor for monitoring moisture transmission inside concrete members involved in this embodiment includes:

[0027] 1. Connect the electrode lead wire 17 to the port of the PTL300E data acquisition box, and the data acquisition box is connected to the imaging computer through the RS232 port, so that the ECT sensor for monitoring the moisture transmission inside the concrete member, the PTL300E data acquisition box and the imaging computer form an ECT system. , grounding and measuring three measurement modes and linear back projection algorithm: Perform image reconstruction, where C is the normalized capacitance vector, S is the normalized sensitive field matrix, is the normalized permittivity vector;

[0028] 2. Determine the capacitance value of the ECT sensor for monitoring the moisture transmission inside the concrete member without installing co...

Embodiment 3

[0034] The principle of the moisture transmission imaging of the ECT sensor for monitoring the moisture transmission inside the concrete member involved in this embodiment is: different substances have different dielectric constants, and the relative dielectric constant of water is about 80, which is much larger than that of dry concrete ( About 6-8), therefore, after water enters the dry concrete, its relative permittivity changes significantly, which in turn causes a change in the capacitance value. The change in the measured capacitance value reflects the distribution of moisture inside the dry concrete. Multi-electrode The capacitance signals of moisture at different positions measured by the array sensor are used as projection data, and the image reflecting the moisture distribution inside the dry concrete can be reconstructed through the image reconstruction algorithm.

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Abstract

The invention belongs to the technical field of concrete member durability monitoring equipment, and relates to an ECT sensor for monitoring the moisture transmission inside a concrete member. The ECTsensor is designed in a round shape. The structures of electrode plates, a clamp and a water storage tank are optimized. The traditional sensor structure design suitable for pipeline two-phase flow measurement is abandoned. Vertical placement and a non-closed design are adopted. Copper foil electrode plates are adhered to the outer wall of a PVC insulating pipe. The size and number of the electrode plates simplify the hardware structure. A metal outer shielding cover is adopted for sealing. A water storage pipe and a water storage pool facilitate the research on the transmission process of moisture in a concrete test piece during water injection at different angles. The sensor is high in sensitivity, low in cost, free of radiation, simple and portable, and can realize nondestructive monitoring. An imaging result can be compared with a shot test piece picture. The defect that there is no verification method for the imaging result of the traditional sensor is overcome, and a scientificbasis is provided for mastering the transmission rule of moisture in concrete and conducting research on the durability of concrete.

Description

Technical field: [0001] The invention belongs to the technical field of durability monitoring equipment for concrete components, and relates to an ECT sensor for monitoring moisture transmission inside a concrete component, which can realize visual monitoring of moisture transmission inside a concrete component. Background technique: [0002] The safety and economic problems caused by the insufficient durability of concrete are increasing and urgently need to be solved. Moisture is the main reason affecting the durability of concrete. Visual monitoring of moisture and quantification of its distribution are the key to studying the durability of concrete. The ECT technology that emerged in the 1980s is a method of inverting the distribution of the internal dielectric constant of the material through the change of the capacitance parameter measured by the array sensor and using a certain image reconstruction algorithm. The ECT technology can realize non-destructive visualizatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/22
CPCG01N27/221G01N27/223G01N27/226
Inventor 张鹏王文涛鲍玖文田玉鹏赵铁军
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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