## 4 Conclusions  
This study examines the impact of ceramic fiber on geopolymer concrete. Based on the data obtained, it can be observed that the  
* The compressive strength tends to increase with higher slag content. The study found that an increase in slag content led to a decrease in workability and an increase in void ratio. However, the addition of 10% silica fume in place of slag in the GS90 specimen resulted in a higher compressive strength value due to the improved void ratio. The void ratio was reduced by approximately 1% with the use of reinforcement.
* Furthermore, ceramic fiber was added to the geopolymer concrete as a convenient material that dissolves easily.
* The ceramic fiber was evenly distributed throughout the internal structure of the geopolymer concrete, resulting in a significant reduction of the high-temperature effect.
* Upon examination of specimens exposed to high temperatures for 2 h, the compressive strength loss in the geopolymer specimens with added ceramic fiber decreased.
* After conducting a high-temperature test at 100 \({}^{\circ}\)C, it was observed that the compressive strength of 0% CFGC increased by 58.04%, 2% CFGC by 31.36%, 5% CFGC by 29.25%, and 10% CFGC by 53.40% compared to the initial strength. In contrast, PCC only experienced a 4.12% increase in compressive strength from its initial strength.
* Additionally, it was found that PCC retained its strength at room temperature following a high-temperature test at 300 \({}^{\circ}\)C. The compressive strength of geopolymer concrete specimens increased by significant percentages after being exposed to high temperatures. These results indicate the potential benefits of incorporating CFGC into geopolymer concrete.
* Specifically, the specimens containing 2%, 5%, and 10% CFGC showed approximately 30% higher compression strength values than PCC and 0% CFGC when measured after a high-temperature test at 600 \({}^{\circ}\)C. At 900 \({}^{\circ}\)C, it was observed that the strength of the specimens increased by approximately 2.5 times.
* It was noted that the compressive strength of the 0% CFGC specimens without adding PCC and ceramic fiber decreased to approximately 10 MPa at 900 \({}^{\circ}\)C. However, the 5% CFGC specimen maintained its compressive strength up to 24.4 MPa at this temperature.
* It was found that the addition of ceramic fiber to geopolymer concrete significantly reduced the decrease in concrete compressive strength by mitigating high-temperature damage.  
The study suggests that the inclusion of ceramic fiber can improve the fire resistance of concrete. It is worth noting, however, that the study only examined the impact of ceramic fiber in geopolymer concretes. Additional research is required to explore the high-temperature performance of ceramic fiber in PCC and other concrete types.  
Conceptualization, B.Y.P.; methodology, B.Y.P.; software, A.D.; validation, B.Y.P.; formal analysis, A.D.; investigation, A.D.; resources, A.D.; data curation, B.Y.P.; writing--original draft preparation, A.D.; writing--review and editing B.Y.P.; visualization, A.D.; supervision, B.Y.P.; project administration, B.Y.P.; funding acquisition, B.Y.P. All authors have read and agreed to the published version of the manuscript.  
This study was founded by the Scientific and Technical Research Council of Turkey (TUBITAK) with project number 221M204.  
Not applicable.  
The original contributions presented in the study are included in the article, further inquiries can be directed to the corresponding authors.  
The authors would like to thank Mersin Oyak Cimento, Cenal Elektrik Uretim A.S., Eti Elektrometalurji A.S. for providing the pozzolanic materials used in this study, PolisanKimya San. A.S. for the superplasticizer, Dersim Beton Nakiye Taahhut Ticaret Limited Company for the fine and coarse aggregate, and RBS Ravago Insat Yahtm Urunleri A.S. for the ceramic fiber.  
The authors declare no conflict of interest.