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Concrete and mortar resistivity sensor

A resistivity sensor and concrete technology, applied in the field of concrete and mortar resistivity sensors, can solve the problems of inaccurate test results and the influence of contact resistance, and achieve the effect of reducing accidental errors, reducing heterogeneity and improving test accuracy

Inactive Publication Date: 2018-03-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a concrete and mortar resistivity sensor in order to solve the problem that the existing measurement method is easily affected by the contact resistance and the test result is inaccurate

Method used

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  • Concrete and mortar resistivity sensor
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  • Concrete and mortar resistivity sensor

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specific Embodiment approach 1

[0014] Specific Embodiment 1: In this embodiment, a concrete and mortar resistivity sensor includes a first group of electrodes 1, a second group of electrodes 2, a third group of electrodes 3, a fourth group of electrodes 4 and a nylon base; wherein the first group of electrodes 1. The second group of electrodes 2, the third group of electrodes 3 and the fourth group of electrodes 4 are all composed of two half-ring electrodes. The two half-ring electrodes of the first group are made of inner diameter 8.0mm, outer diameter 24.0mm, The metal ring with a thickness of 8.7mm is equally divided; the two half-ring electrodes of the second group are formed by a metal ring with an inner diameter of 24mm, an outer diameter of 33mm, and a thickness of 7.7mm; The first half-ring electrode is divided into metal rings with a diameter of 33.0mm, an outer diameter of 40.0mm, and a thickness of 6.7mm; the fourth group of two half-ring electrodes has an inner diameter of 40mm, an outer diamete...

specific Embodiment approach 2

[0018] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the metal ring is made of stainless steel or titanium, and the others are the same as Embodiment 1.

specific Embodiment approach 3

[0019] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is that the exposed areas of the first group of electrodes 1, the second group of electrodes 2, the third group of electrodes 3 and the fourth group of electrodes 4 are all 334mm 2 , and the others are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a concrete and mortar resistivity sensor, and aims to solve a problem that the existing measurement method is susceptible to the contact resistance and inaccurate in test result. The resistivity sensor comprises a first set of electrodes, a second set of electrodes, a third set of electrodes, a fourth set of electrodes and a nylon base, wherein each set of electrodes is formed by two semi-ring electrodes, and the semi-ring electrodes are formed by equally dividing a metal circular ring; and the nylon base is formed by stacking four layers of insulating rings, the diameter of the insulating ring at each layer is reduced layer by layer along the axial direction of the nylon base, and each set of electrodes is respectively arranged on the insulating ring at the corresponding layer in a sleeved manner. The concrete and mortar resistivity sensor reduces influences imposed on a test result by the contact resistance, eliminates an error caused by the existence of coarse aggregate, improves the test accuracy and can achieve real-time measurement for the resistivity of concrete and mortar. The concrete and mortar resistivity sensor is applied to the field of resistance sensors.

Description

technical field [0001] The invention belongs to the technical field of resistivity sensors, in particular to a resistivity sensor for concrete and mortar. Background technique [0002] Resistivity is an important electrical performance parameter of materials. For common bulk materials, there are international and domestic specifications and standards for the measurement of resistivity, and the resistivity of many commonly used materials can be queried in relevant data sheets. However, for concrete materials, its internal structure is very complex, with the characteristics of multiphase and porous structure, showing a high degree of inhomogeneity. The conductivity of concrete is the electrolytic process that occurs when ions flow in the pore fluid of cement paste. In engineering, the resistivity of concrete is often used to measure the conductivity of concrete. The resistivity of concrete can vary widely, from 10 to 10 when dry. 11 Ω·cm changes to 10 when saturated with wat...

Claims

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Application Information

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IPC IPC(8): G01R27/02G01R27/22
CPCG01R27/02G01R27/22G01N33/383
Inventor 卢爽赵德志
Owner HARBIN INST OF TECH
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