Comparison of tensile strength of aerated concrete and ordinary concrete, under high temperature

Document Type : research - paper

Authors

1 Ph.D Student in Civil Engineering, Department of Civil Engineering, Chalous Branch, Islamic Azad University, Chalous, Iran

2 Department of Civil Engineering, Chalous Branch, Islamic Azad University, Chalous, Iran

3 Department of Civil Engineering, Lahijan Branch, Islamic Azad University, Lahijan, Iran

Abstract

In recent years, the use of processed mineral resources in the science of civil engineering has gained a wide scope. Some of these materials, such as slag-furnace-slag, can improve adhesion and filling in the structure of concrete due to the presence of abundant silica-aluminate materials in them. In this laboratory research, a mixing design was made of ordinary concrete with a cement grade of 450 kg/m3. A mixing design was also made of activated alkali concrete based on blast furnace slag to compare and evaluate the tensile strength of concrete under ambient temperature and heat of 500 degrees Celsius, at the age of 90 days. Next, X-ray diffraction (XRD) and scanning electron microscope (SEM) images at the processing age of 90 days at ambient temperature and under heat of 500 ℃, in order to further investigate and verify the results of the resistance test. Tensile testing was done on concrete samples. The obtained results indicate that the tensile strength at ambient temperature is 5.048 MPa for ordinary concrete and 4.41 MPa for activated alkali concrete, which had a difference of 12.63%. By applying high heat to the concrete samples, the amount of tensile strength drop in normal concrete reached 51% and in alkali activated concrete 21%. The results of the XRD and SEM tests were in agreement with each other and overlapped with the results of the tensile strength test.

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References

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Journal of Mining Engineering
Volume 17, Issue 57
December 2022
Pages 37-46

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History

  • Receive Date: 06 December 2021
  • Revise Date: 28 July 2022
  • Accept Date: 20 October 2022

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