Monitoring method for solidification process of concrete test blocks on basis of piezoelectric impedance method

A technology of concrete test block and piezoelectric impedance method, which is applied in the direction of material resistance to achieve the effect of accurate quality control

Inactive Publication Date: 2014-11-26
SHANGHAI INSTITUTE OF TECHNOLOGY
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Problems solved by technology

[0003] The present invention aims at the importance of monitoring the concrete structure after pouring, and proposes a monitoring method for the solidification process of the concrete tes

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  • Monitoring method for solidification process of concrete test blocks on basis of piezoelectric impedance method
  • Monitoring method for solidification process of concrete test blocks on basis of piezoelectric impedance method
  • Monitoring method for solidification process of concrete test blocks on basis of piezoelectric impedance method

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Embodiment Construction

[0022] A method for monitoring the curing process of concrete test blocks based on the piezo-electrical impedance method, extracting the resonance frequency shift index and the root mean square deviation shift index from the piezoelectric admittance signal of the piezoelectric ceramic pasted on the concrete test block to monitor the concrete test block Changes in block compressive strength and modulus of elasticity during curing. Further, it includes the following steps:

[0023] 1) Perform piezoelectric impedance test on the concrete test block and obtain the compressive strength, elastic modulus and piezoelectric admittance signal of the concrete test block;

[0024] 2) Analyze and process the piezoelectric admittance signal to obtain the resonance frequency and the root mean square deviation. The formula for calculating the root mean square deviation is:

[0025]

[0026] In the formula: Y k is the piezoelectric admittance signal, N is the number of sampling points...

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Abstract

The invention relates to a monitoring method for the solidification process of concrete test blocks on the basis of a piezoelectric impedance method. The monitoring method comprises the step of extracting a resonance-frequency offset index and root-mean-square offset index in piezoelectric admittance signals of piezoelectric ceramic stuck on the concrete test blocks to monitor the change of the compressive strength and the elastic modulus of the concrete test blocks in the solidification process. The monitoring method provides a new path for monitoring the compressive strength and the elastic modulus of the concrete test blocks in the solidification process in real time. Compared with the prior art, the monitoring method has the advantages that fast monitoring can be realized, and the compressive strength and the elastic modulus of the concrete test blocks can be fast obtained under the condition without a pressure machine, so that the quality of the concrete in the casting process is accurately controlled.

Description

technical field [0001] The invention relates to a structure monitoring technology, in particular to a method for monitoring the solidification process of a concrete test block based on a piezoelectric impedance method. Background technique [0002] As an important basis for concrete structure design, compressive strength and elastic modulus are the main mechanical properties of concrete. According to the traditional method, usually after 28 days of standard curing, the concrete specimens can be obtained after passing the test. For construction sites, it is often the case that large quantities of concrete with a certain mix ratio have been poured before the compressive strength is known and it is not known whether it will meet the requirements. On the contrary, if the expected 28-day strength and elastic modulus can be obtained within a few hours after pouring the concrete, measures including adjusting the mix ratio can be taken to control the quality of the concrete. Cont...

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Application Information

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IPC IPC(8): G01N27/04
Inventor 郭智刚孙智
Owner SHANGHAI INSTITUTE OF TECHNOLOGY
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