Modulus of Elasticity and Poisson Ratio of Concrete

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Modulus of Elasticity and Poisson Ratio of
Concrete

• By Tzu-Ting Yang
• Byoungsok Shin

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Abstract

• The construction industry has taken considerable
  strides forward over the last two or three
  decades with regard to many materials.
• High Strength Concrete (HSC) and generally Higher
  Performing Concrete Materials, or High
  Performance Concrete (HPC) shows us enormous
  possibility for concrete to affect society.

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Introduction of the project

• Determination of compressive strength of
  cylindrical concrete specimens such as molded
  cylinders.
• To gain additional knowledge on property of
  concrete such as Youngs modulus and Poisson
  ratio.

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Procedure

• Select six cylindrical concrete specimens.
• Attach strain gauges on specimens.
• Connect wires on each strain gauge.
• Cap all end bearing surfaces of specimens
• Place an attached strain gauges and capped
  cylindrical concrete specimens on the SATEC
  hydraulic universal testing machine.
• Press loading and measure data.

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Picture I
6
Picture II
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Data
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Graph I
0.4fc
e (vertical)
e (horizontal)
E
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Graph II
Sample 6
Sample 1
ACI Code
Sample 2
Sample 5
Sample 3
Sample 4
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Calculation

• a) Youngs Modulus
• E P / A
• E2 2658.273/ (598.8-50) 106 4843294
• E5 2731.838/ (745.6-40)106 3870464
• b) Poissons Ratio
• Vex/ ey
• V2 90.2/ 598.8 0.150635
• V5 80.5/ 745.6 0.107967

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Result
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Conclusion

• From our data results, figure 7, the specimen 6
  is the way far from the ACI code. So we can
  conclude that the specimen 6 have some errors
  appear while doing the cylinder sample.
• Neglect number 6 of our specimen and take an
  average of them, we get the Poissons ratio is
  0.136394. According to our textbook, the
  Poissons ratio is frequently taken as 0.15 to
  0.25. In other words, our experiment is very
  successful.