## 1 Introduction  
Concrete is an economical construction material that has been used for a long time in buildings and other infrastructures in modern society. Concrete is an inert material with better performance at high temperature exposure than that of other construction materials, such as timber and steel, owing to its non-combustibility and low thermal conductivity [1]. However, various problems have been observed in conventional concrete, such as low strength and brittle fracture behavior. High-performance fiber reinforced cemented composites (HPFRCCs) can be used to provide high compressive strength and ductile behavior to address these problems. Structures are increasing in size with a wide usage range because of the rapid development of construction technology. The functions of the structures are also becoming more complex. The explosion and fire factors are increasing each day. [2]. Recently, HPFRCCs have been evaluated to improve the impact and explosion functions in preparation for unexpected terrorism and explosion accidents. HPFRCCs are generally susceptible to severe damage under fire conditions [3, 4]. Steel fiber can support the structure of concrete at elevated temperatures due to a high melting point [5; 6]. The engineered cementitious composite (ECC) material is based on polymeric fibers, e.g., polypropylene (PP) and polyvinyl alcohol (PVA) fibers. The vapor pressure that formed by fire can be effectively relieved and, consequently, ECC shows better spalling resistance than that of plain mortar [7; 8]. ECC has improved fire resistance due to the use of polymeric fibers, such as polyvinyl alcohol (PVA) fibers, which can melt and create channels for alleviating internal vapor pressure, thus preventing explosive spalling [6; 7; 8; 9]. Numerous studies have evaluated the residual mechanical properties of HPFRCCs, i.e., slurry-infiltrated fiber-reinforced concrete (SIFCON), ultra-high-performance fiber-reinforced concrete (UHPFRC), etc., which were exposed to an elevated temperature [3; 4; 7; 10; 11; 12; 13]. Post-fire pull-out tests of steel bars that were embedded in HPFRCC showed that the use of HPFRCC enhanced the bond strength [14]. Steel fibers approximately doubled the toughness of the unheated concrete. The fibers were effective in reducing the degradation of compressive strength of the concrete after exposure to the elevated temperatures. The steel fiber reinforced concretes also had the highest toughness values after high-temperature exposures [15]. The degradation of mechanical performances of BFRP laminated structural due to high temperature is because of the decomposition of the epoxy resin matrix with increasing temperatures. Internal de-bonding occurs in the fibers due to the weak adhesion of epoxy resin matrix at a high temperature [16]. Slurry-infiltrated fiber-reinforced cementitious composites (SIFRCCs) and HPFRCCs in the form of SIFCON were developed to provide sufficient energy absorption capacity and excellent resistance against unexpected impacts and explosions. SIFRCCs improve tensile resistance and crack propagation after maximum load, owing to the high volume of steel fiber. The high volume fraction of steel fiber in SIFRCCs provided high direct tensile strength, compressive strength, and improved brittleness [17]. The flexural strength decreases as the exposure temperature increases, owing to the loss of water and the strength of the slurry matrix [18]. However, the absence of capillary pores in SIFRCCs makes it more susceptible to explosive spalling. The vapor pressure increase and non-uniform increase in temperature cause the explosive spalling of the SIFRCCs at a high temperature. Polymer mix concrete is a new material emerging in the construction industry. The presence of the polymer introduces a considerable improvement in the ductility of the material, drastically reducing the surface cracking, which is prerequisite for increasing the durability and for reducing stiffness damage [19].