Experimental Study of Impact Strength in Ordinary Concrete under High Temperature, Along with Validation by SEM and XRD

Document Type : Original Article

Author

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

Abstract

Increasing the resistance and resistance of structures against the forces caused by various accidents, has always been considered by design engineers. In recent decades, the creation of defensive conditions in structures of great importance and very high impact against loads is an integral part of structural designs. In this laboratory research, a mixing plan was made of ordinary concrete containing Portland cement type 2 with a grade of 500 kg/m3. Impact strength test of falling weight in concrete was performed on concrete samples at 90-day curing age at 21, 300 and 600 °C. In order to further evaluate and validate the results, scanning electron microscopy (SEM) and X-ray diffraction (XRD) spectroscopy tests were performed on concrete samples at 90 days of processing age. The results of the tests of this research were evaluated and compared with the results of the research of others. Heat application in concrete samples had a significant effect on the results. In this regard, in the drop weight test, the absorbed energy increased from 269.7214 (at 21 °C) to 41.5956 (at 600 °C) and decreased It had 76.92 percent and the flexibility index increased from 2.3 (at 21 degrees Celsius) to 2.5 (at 600 °C) and improved by 69.8 percent. At the end of this study, the results of SEM and XRD analysis at 21 °C and high temperature, while coordinating with each other, overlapped with the results of other tests in this article.

Keywords

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References

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History

  • Receive Date: 18 December 2021
  • Revise Date: 17 July 2022
  • Accept Date: 18 September 2022

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