Flexural behavior of fire-damaged reinforced concrete beams repaired with high-strength fiber reinforced mortar

Muhd Afiq Hizami Abdullah (Faculty of Engineering Technology, Universiti Malaysia Perlis, Perlis, Malaysia)
Mohd Zulham Affandi Mohd Zahid (Faculty of Engineering Technology, Universiti Malaysia Perlis, Perlis, Malaysia)
Afizah Ayob (School of Environmental Engineering, Universiti Malaysia Perlis, Perlis, Malaysia)
Khairunnisa Muhamad (Faculty of Engineering Technology, Universiti Malaysia Perlis, Perlis, Malaysia)

Journal of Structural Fire Engineering

ISSN: 2040-2317

Publication date: 28 February 2019

Abstract

Purpose

The purpose of this study is to investigate the effect on flexural strength of fire-damaged concrete repaired with high-strength mortar (HSM).

Design/methodology/approach

Reinforced concrete beams with dimension of 100 mm × 100 mm × 500 mm were used in this study. Beams were then heated to 400°C and overlaid with either HSM or high-strength fiber reinforced mortar (HSFM) to measure the effectiveness of repair material. Repaired beams of different material were then tested for flexural strength. Another group of beams was also repaired and tested by the same procedure but was heated at higher temperature of 600°C.

Findings

Repair of 400°C fire-damaged samples using HSM regained 72 per cent of its original flexural strength, 100.8 per cent of its original toughness and 56.9 per cent of its original elastic stiffness. Repair of 400°C fire-damaged samples using HSFM regained 113.5 per cent of its original flexural strength, 113 per cent of its original toughness and 85.1 per cent of its original elastic stiffness. Repair of 600°C fire-damaged samples using HSM regained 18.7 per cent of its original flexural strength, 25.9 per cent of its original peak load capacity, 26.1 per cent of its original toughness and 22 per cent of its original elastic stiffness. Repair of 600°C fire-damaged samples using HSFM regained 68.4 per cent of its original flexural strength, 96.5 per cent of its original peak load capacity, 71.2 per cent of its original toughness and 52.2 per cent of its original elastic stiffness.

Research limitations/implications

This research is limited to the size of the furnace. The beam specimen is limited to 500 mm of length and overall dimensions. This dimension is not practical in actual structure, hence it may cause exaggeration of deteriorating effect of heating on reinforced concrete beam.

Practical implications

This study may promote more investigation of using HSM as repair material for fire-damaged concrete. This will lead to real-world application and practical solution for fire-damaged structure.

Social implications

The aim of this research in using HSM mostly due to the material’s high workability which will ease its application and promote quality in repair of damaged structure.

Originality/value

There is a dearth of research on using HSM as repair material for fire-damaged concrete. Some research has been carried out using mortar but at lower strength compared to this research.

Keywords

Acknowledgements

The authors would like to acknowledge the facility provided by Environmental Engineering Faculty of University Malaysia Perlis and FRGS 9003-00407 research grant for funding this research.

Citation

Abdullah, M.A.H., Mohd Zahid, M.Z.A., Ayob, A. and Muhamad, K. (2019), "Flexural behavior of fire-damaged reinforced concrete beams repaired with high-strength fiber reinforced mortar", Journal of Structural Fire Engineering, Vol. 10 No. 1, pp. 56-75. https://doi.org/10.1108/JSFE-08-2017-0039

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Emerald Publishing Limited

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