Review of Repair Materials for Fire-Damaged Reinforced Concrete Structures

Malaysian Technical Universities Conference on Engineering and Technology 2017

Zahid, M.Z..A Mohd^1 ; Bakar, B.H. Abu^2 ; Nazri, F.M.^2 ; Ahmad, M.M.^1 ; Muhamad, K.^1

Department of Civil Engineering Technology, Faculty of Engineering Technology, Universiti Malaysia Perlis, Uniciti Alam Campus, Padang Besar, Perlis

02100, Malaysia^1

School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus, Nibong Tebal, Pulau Pinang

14300, Malaysia^2

关键词: Carbon fiber reinforced polymer;    Fiber-reinforced concretes;    Glass fiber reinforced polymer;    Normal strength concretes;    Reinforcing steels;    Repair materials;    Residual strength;    Ultra-high-performance fiber-reinforced concrete;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/318/1/012023/pdf
DOI  :  10.1088/1757-899X/318/1/012023

来源: IOP

【 摘 要 】

Reinforced concrete (RC) structures perform well during fire and may be repaired after the fire incident because their low heat conductivity prevents the loss or degradation of mechanical strength of the concrete core and internal reinforcing steel. When an RC structure is heated to more than 500 °C, mechanical properties such as compressive strength, stiffness, and tensile strength start to degrade and deformations occur. Although the fire-exposed RC structure shows no visible damage, its residual strength decreases compared with that in the pre-fire state. Upon thorough assessment, the fire-damaged RC structure can be repaired or strengthened, instead of subjecting to partial or total demolition followed by reconstruction. The structure can be repaired using several materials, such as carbon fiber-reinforced polymer, glass fiber-reinforced polymer, normal strength concrete, fiber-reinforced concrete, ferrocement, epoxy resin mortar, and high-performance concrete. Selecting an appropriate repair material that must be compatible with the substrate or base material is a vital step to ensure successful repair. This paper reviews existing repair materials and factors affecting their performance. Of the materials considered, ultra-high-performance fiber-reinforced concrete (UHPFRC) exhibits huge potential for repairing fire-damaged RC structures but lack of information available. Hence, further studies must be performed to assess the potential of UHPFRC in rehabilitating fire-damaged RC structures.