Usage of Digital Image Correlation (DIC) in Determination of Modulus of Elasticity and Poisson's Ratio of Special Concrete

2018 ◽  
Vol 272 ◽  
pp. 154-159
Author(s):  
Vladimír Suchánek ◽  
Tomáš Bednarz ◽  
Tomáš Svojanovský
Keyword(s):  
Reinforced Concrete ◽  
Modulus Of Elasticity ◽  
Poisson’S Ratio ◽  
Vertical Direction ◽  
High Strength ◽  
Image Correlation ◽  
Poisson's Ratio ◽  
Fibre Reinforced Concrete ◽  
Steel Fibre Reinforced Concrete

This paper deals with an evaluation of long-term experimental work carried out in cooperation with concrete suppliers and a specific company (named Sobriety). The key part of this work is focused on the experimental determination of secant modulus of elasticity and Poisson's Ratio of special concrete (self-compacting concrete, steel fibre reinforced concrete, polymer fibre reinforced concrete, specific high-strength concrete). Two different real-time approaches were used to detect modulus of elasticity. In parallel, both approaches - the (European) standard approach and the DIC (2D DIC; 3D DIC with varying lengths in the vertical direction) - were applied.

scholarly journals DETERMINATION OF THE POISSON’S RATIO IN CONCRETE BY USING DITIGITAL IMAGE CORRELATION

2021 ◽  
pp. 26-32
Author(s):  
Yaroslav Blikharskyy
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Poisson’S Ratio ◽  
Concrete Strength ◽  
Correlation Method ◽  
Image Correlation ◽  
Poisson's Ratio ◽  
Digital Correlation ◽  
Transverse Stresses

The article presents the results of the experimental investigation of concrete prismsand determination of the Poisson's ratio using the method of digital image correlation (DIC). Toachieve the goals and objectives of the research, a concrete prism measuring 100x100x400 mm ofclass C50 / 60 was formed. The surface of the prism was cleaned and levelled to a smooth surfacewith a mechanical device and grinding stone. The surface of the prism is then cleaned with a solventto remove dust residues. After that, speckles were applied to determine the strain using the DICmethod. For determine the strain, by using digital image correlation, were used Two FlirGrasshopper 3 cameras with a Computar F25 / 2.8 lens and a Sigma 70-200 mm f2.8 APO EX DGHSM Macro II lens. Stains for image correlation were recorded at a speed of 250 ms. 2 LED lampswere used for lighting. Since the press is not able to record the load in time, to record the load useda camera at a speed of 50 frames/sec. The load was applied evenly at the same rate to the physicaldestruction of the test samples. As a result, the images were processed using VIC-2D software toobtain vertical and transverse strains. The advantage of the image correlation method is the abilityto obtain deformations and, accordingly, the stress of the full surface of the sample. Thus, if weanalyse the horizontal (transverse) stresses for a prism with a concrete strength of C50 / 60, it ispossible to see the appearance of internal cracks in the sample before it occurs outside, at a timewhen cracks cannot be visually fixed. As a result of work the technique of testing of concrete sampleswith use of digital correlation of the image is developed and presented. The Poisson's ratio from thebeginning of loading to the destruction of the sample was determined experimentally by the developedmethod.

Modulus of Elasticity in Tension for Concrete and Fibre Reinforced Concrete

2017 ◽  
Vol 259 ◽  
pp. 35-40 ◽  
Author(s):  
Martin Tipka ◽  
Jitka Vašková
Keyword(s):  
Reinforced Concrete ◽  
Uniaxial Tension ◽  
Modulus Of Elasticity ◽  
Tension Test ◽  
Experimental Program ◽  
Cementitious Composites ◽  
Fibre Reinforced Concrete ◽  
Uniaxial Tension Test

The paper deals with the determination of the modulus of elasticity in tension for cementitious composites and comparing these values with the values of modulus in compression. It describes several methods, which are usually used for determination of modulus of elasticity of concrete and fibre reinforced concrete. In the experimental program modulus of elasticity in compression and tension of various types of concrete and fibre reinforced concrete were compared. The classic test with prismatic specimens was used for determination of the modulus in compression; a new arrangement of uniaxial tension test of cementitious composites was used for determination of the modulus of elasticity in tension.

Bond Behaviour of Frp Reinforcing Bars in High-Strength Steel Fibre-Reinforced Concrete

2007 ◽  
Vol 15 (7) ◽  
pp. 569-578 ◽  
Author(s):  
Jong-Pil Won ◽  
Chan-Gi Park ◽  
Hwang-Hee Kim ◽  
Sang-Woo Lee ◽  
Cheol Won
Keyword(s):  
Reinforced Concrete ◽  
High Strength Steel ◽  
High Strength Concrete ◽  
Steel Fibre ◽  
High Strength ◽  
Fibre Reinforced Concrete ◽  
Reinforcing Bars ◽  
Bond Behaviour ◽  
Steel Fibre Reinforced Concrete ◽  
Pullout Load

Current design trends for structures require the increased use of high-strength concrete, which has a compressive strength of over 80 MPa. Its enhanced strength, however, leads to brittle failure problems, which have been resolved by adding steel fibres. Fibre-reinforced polymer (FRP) is actively being studied to resolve the corrosion problems encountered with steel reinforcing bars in concrete structures exposed to adverse environmental conditions. In this study, we experimentally evaluated the bond behaviour of FRP reinforcing bars in high-strength steel fibre-reinforced concrete. A high-strength concrete mix was created with a target strength of over 80 MPa, and steel fibre was added. The FRP reinforcing bars had an increased pullout load with a slow gradient, and the slope of the pullout load reduction curve remained small after the maximum pullout load was reached. In addition, the bond strength increased as steel fibre was added to the FRP reinforcing bar.

Determination of creep compliance, recovery and Poisson's ratio of elastomers by means of digital image correlation (DIC)

2017 ◽  
Vol 59 ◽  
pp. 245-252 ◽  
Author(s):  
Leonardo Israel Farfán-Cabrera ◽  
Juan Benito Pascual-Francisco ◽  
Omar Barragán-Pérez ◽  
Ezequiel Alberto Gallardo-Hernández ◽  
Orlando Susarrey-Huerta
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Poisson’S Ratio ◽  
Creep Compliance ◽  
Image Correlation ◽  
Poisson's Ratio
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