## 5 Conclusions  
This research investigates Self Compacting Fiber mix concrete slabs' performance under the exposure of hydrocarbon fire, where the addition of PVA and Basalt fiber, under ambient conditions, improves the tensile, post-cracking, and durability properties of concrete. It has been found:  
In the temperature measurement of slab sufaces unexposed to fire, it was found that the addition of fibers resulted in an average reduction of ten degrees Celsius in temperature, which may be considered as a significant effect. One of the reasons is that both basalt and PVA fibers are good insulators of heat.  
When comparing the temperature distribution within the slab sections after 120 min of fire exposure, it was concluded that the addition of fibers improved the insulation characteristics; i.e., the first two thermocouples (at 25 and 50 mm from the fire face) showed a 10 to 18% lower temperature as compared to the control mix. Similar observations were made after 60 min of fire exposure. It is found that the first 50 mm of slab thickness, which is directly exposing to fire, is most critical for 60 min and 120 min of fire exposure, whereas the rest of the 250 mm thickness of slab experienced 100 \({}^{\circ}\)C or below.  
It is concluded that the addition of fibers caused a reduction in compressive strength in the range of 4 to 15% compared to the strength of the controlled concrete. After 120 min of exposure to simulated hydrocarbon fire, fiber reinforced concrete resulted in high strength reduction (25 to 38%) compared to the controlled mix (21%). The higher reduction could be due to softening and stiffness reduction in fibers after exposure to high temperature for 120 min.  
With the addition of fibers, the split cylindrical tensile strength has improved because of the crack bridging effects of fibers. Similarly, after exposing to 120 min of fire, the samples showed a lower reduction in strength than that observed in the compressive strength test.  
Microstructure analysis using SEM showed that after exposure to high temperatures, PVA fibers suffered the peeling of a thin layer from the fiber surface. Whereas, with the use of basalt fibers, at high temperature, mineral crystals are formed on the surface of the fibers. It is also observed that the lower performance of basalt fiber reinforced concrete was due to the weak bond of fibers with cement matrix despite high fire resistance.  
N.M.J. performed experimental work, data analysis, and draft writing of manuscript; M.S.N. supervision, funding acquisition, conceptualization, coordinated the experimental work and facilitated the resources, and editing of the manuscript; N.S. supervision, conceptualization, methodology, checked the technical details, editing and final review of the manuscript; and I.H. advised on fire testing, and methodology. All authors have read and agreed to the published version of the manuscript.  
This research was funded by Promat (Malaysia); grant number: 0153 AB-D17.  
The authors are grateful for acknowledging financial support from Promat (Malaysia) to perform this research. The authors also would like to express their gratitude to Fire Science Research Group for allowing the first author to utilize their free testing furnace and providing the required resources and materials to construct and test the thermal performance of all concrete slabs.  
Figure 15: Effects of fire on FRC with 1.5% fiber content, (**a1**) unfired FRC-1.5%PF, (**a2**) FRC-1.5%PF after 120 min of fire, (**b1**) unfired FRC-1.5%BF, (**b2**) FRC-1.5%BF after 120 min of fire.