Evaluating Damaged Concrete Depth in Reinforced Concrete Structures under Different Fire Exposure Times by Means of NDT and DT Techniques

Authors

  • Totsawat Daungwilailuk Hiroshima University
  • Thi Nguyen Cao Chulalongkorn University
  • Withit Pansuk Chulalongkorn University
  • Phoonsak Pheinsusom Chulalongkorn University

DOI:

https://doi.org/10.4186/ej.2017.21.7.233

Abstract

After a severe fire, concrete structures are generally capable of being repaired rather than demolished. To determine whether the fire-damaged structure can be repaired, an assessment of structural integrity must be conducted. In this research, a laboratory assessment of fire-damaged reinforced concrete (RC) slabs was carried out by using Destructive Testing (DT) and Non-Destructive Testing (NDT) techniques. The study aimed to evaluate the depth of damaged concrete in RC slabs exposed to fire for different periods of time (30, 60, 90 and 120 minutes) based on the correlation between the experimental results of DT and NDT methods. The experiment was conducted with two concrete grades of 24 and 35 MPa. Limestone aggregates were used in this study. The experimental results indicated that 30 minutes of heating time did not show severe effects on reinforced concrete slabs in comparison with the other cases. A damaged concrete layer of 30 – 45 mm was observed for slabs exposed to fire in 60 and 90 minutes. Besides, 24 MPa slabs also showed a lower damage level compared with 35 MPa slabs.

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Author Biographies

Totsawat Daungwilailuk

Department of Civil and Environmental Engineering, Hiroshima University, Hiroshima, Japan

Thi Nguyen Cao

Innovative Construction Materials Research Unit, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Withit Pansuk

Innovative Construction Materials Research Unit, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Phoonsak Pheinsusom

Innovative Construction Materials Research Unit, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

Published

Vol 21 No 7, Dec 29, 2017

How to Cite

[1]
T. Daungwilailuk, T. N. Cao, W. Pansuk, and P. Pheinsusom, “Evaluating Damaged Concrete Depth in Reinforced Concrete Structures under Different Fire Exposure Times by Means of NDT and DT Techniques”, Eng. J., vol. 21, no. 7, pp. 233-249, Dec. 2017.