Application of Digital Speckle Correlation Method in Observation of Conrete Micro-Crack Damage

2014 ◽  
Vol 578-579 ◽  
pp. 1290-1294
Author(s):  
Zhen Qiang Wang ◽  
Yan Liu
Keyword(s):  
Crack Opening ◽  
Correlation Method ◽  
Damage Parameter ◽  
Opening Displacement ◽  
Damage Area ◽  
Digital Speckle Correlation Method ◽  
Speckle Correlation ◽  
Splitting Test ◽  
Digital Speckle ◽  
Digital Speckle Correlation

The splitting test for concrete specimens in four different dimensions were carried out in order to build the relative even micro-crack damage fields. The real-time whole-field displacements of concrete surface were measured omni-directionally by DSCM(Digital Speckle Correlation Method). Through analyzing the obtained experimental data, two kinds of micro-crack damage parameter are established :one is damage area based on the MCOD (Micro-Crack Opening Displacement) and another is damage variable based on the weighting-damping elastic modulus, which provides a new index and method for characterization of concrete micro-crack damage.

Experimental Study on the Influences of Deffctive Concrete on Chloridion Penetration Resistance

2011 ◽  
Vol 368-373 ◽  
pp. 1165-1170 ◽  
Author(s):  
Yan Liu ◽  
Cheng Yi
Keyword(s):  
Diffusion Coefficients ◽  
Crack Opening ◽  
Correlation Method ◽  
Chloride Ion ◽  
Opening Displacement ◽  
Damage Area ◽  
Digital Speckle Correlation Method ◽  
Speckle Correlation ◽  
Splitting Test ◽  
Before And After

Micro-crack defects in concrete can affect the Chloride ion permeability of concrete in a certain extent. In the paper, the splitting experiments of concrete specimens from the four different dimensions are carried out in order to build the even damage fields. The displacements of the concrete specimens’ surface are analyzed through DSCM (Digital Speckle Correlation Method). Therefore damage parameters are determined that are damage area based on the MCOD (Micro-Crack Opening Displacement) and damage variable DE based on the weighting-damping elastic modulus. At the same time, Clˉ permeation of concrete specimens before and after the splitting test are studied by NEL method, and Clˉ diffusion coefficients D are recorded in detail. Further relationships between damage parameters and diffusion coefficients of Clˉ are discussed.

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