Pressure-sensitive performance testing method of pressure-sensitive cement-base materials

A technology of cement-based materials and testing methods, which is applied in the measurement of property force of piezoelectric resistance materials, material resistance, material inspection products, etc., can solve the problems of complicated production, expensive testing electrodes, low durability and accuracy question

Inactive Publication Date: 2006-08-16
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 pressure-sensitive performance testing method for pressure-sensitive cement-based materials, so as to overcome

Method used

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  • Pressure-sensitive performance testing method of pressure-sensitive cement-base materials
  • Pressure-sensitive performance testing method of pressure-sensitive cement-base materials

Examples

Experimental program
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Example Embodiment

[0006] Specific implementation manner one: the following combination figure 1 This embodiment will be described in detail. This embodiment is achieved through the following steps: 1. Four pieces of mesh metal electrodes 1 are arranged in parallel with each other, and the four pieces of mesh metal electrodes 1 are embedded with pressure-sensitive cement-based materials and then solidified into a whole. Every two pieces of mesh metal electrodes 1 There is a pressure-sensitive cement-based material in the middle; 2. Apply a DC voltage E between the two mesh metal electrodes 1 on the outer side, measure and calculate the first resistance R1 between the two mesh metal electrodes 1 on the inner side; 3. 1. Apply pressure G in the direction perpendicular to the four mesh metal electrodes 1; 4. Measure and calculate the second resistance R2 of the pressure-sensitive cement-based material between the two mesh metal electrodes 1 located on the inner side; 5. Determine the pressure G The re...

Example Embodiment

[0007] Specific implementation manner two: the following combination figure 1 This embodiment will be described in detail. The difference between this embodiment and the first embodiment is: in step two, a direct current voltage E is applied between the two mesh metal electrodes 1 located on the outside and the current I1 in the pressure-sensitive cement-based material between the two is measured at the same time. The voltage U1 between the two mesh metal electrodes 1 located on the inner side; calculate the first resistance R1 of the pressure-sensitive cement-based material between the two mesh metal electrodes 1 located on the inner side, R1 = U1 / I1; in step 4, measure The current I2 in the pressure-sensitive cement-based material between the two mesh metal electrodes 1, and the voltage U2 between the two mesh metal electrodes 1 on the inner side are measured at the same time, and the pressure-sensitive cement between the two mesh metal electrodes 1 on the inner side is calcula...

Example Embodiment

[0008] Specific implementation manner three: the following combination figure 2 This embodiment will be described in detail. The difference between this embodiment and the second embodiment is: in step 2, a direct current voltage is applied between the standard reference resistor R3 and the two outer mesh metal electrodes 1 that form a series circuit with the standard reference resistor R3, and extract The voltage U3 at both ends of the standard reference resistor R3 is processed by the signal amplifying circuit 2 and the A / D conversion circuit 3 to process the voltage U3, and then input into the microprocessor or computer 4, and at the same time extract the two nets located on the inner side The voltage U4 between the metal electrodes 1 is processed by the signal amplifying circuit 5 and the A / D conversion circuit 6 to process the voltage U4, and then input into the microprocessor or computer 4 to calculate the two pieces of mesh metal located inside The first resistance R1 of th...

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Abstract

A method for testing pressure-sensitive property of pressure-sensitive cement based material includes setting four mesh metal electrodes in parallel to each other, burying them in cement based material then solidifying said material, exerting DC voltage between two electrodes at external side for measuring out the first resistance between two electrodes at internal side, exerting pressure at vertical direction of mesh electrodes for measuring out the second resistance at internal side then confirming relation of pressure to resistance variation rate.

Description

technical field [0001] The invention relates to a pressure-sensitive performance testing method applied to intelligent civil materials and structural systems. Background technique [0002] In 1989, Professor D.D.L.Chung of the United States discovered that after the traditional cement-based material was mixed with chopped carbon fiber, the volume resistance of the carbon fiber cement-based composite material produced would change regularly under the action of load, so the carbon fiber cement-based material could It senses its own stress, strain and damage through the change of resistivity, that is, it has pressure sensitivity. Other conductive materials, such as carbon black, graphite and nanoparticles, etc., combined with cement-based materials, or some of these functional components combined with cement-based materials also have this pressure-sensitive property. Since the pressure-sensitive cement-based material has the characteristics of high pressure sensitivity, good d...

Claims

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Application Information

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IPC IPC(8): G01N33/38G01N27/20G01L1/18
Inventor 欧进萍韩宝国关新春
Owner HARBIN INST OF TECH
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