Özet:

Self-installed concrete (KYB) is high performance compared to conventional concrete, which provides advantages such as high processability, low labour costs and high durability. The objective of this study is to produce and determine the impact on the processability of fresh concrete samples of polypropylene fiber (0,25; 0,50; 0,75 and 1,00 kg/m3) in different proportions in the produced CYB and the resistance of solid control samples. Hardy samples are subjected to temperatures of 25, 250, 500 and 750°C. Also, ultrasound transition speed measurements have been carried out to get an idea about the vacuum structures of samples. The study found that the increased amount of polypropylene fiber affected the liquidity of the self-located concrete in a negative direction, the pressure resistance did not change and the pull resistance changed in a positive direction. At temperatures 500oC and above, the pressure resistance of concrete and ultrasound transition rate measurements have been found to be reduced. As the temperature increases, polypropylene fibers are diluted and as a result, the increase in the vacuum formed in concrete has been observed, and its resistance is reduced. The maximum strength loss was observed at 750 oC. Therefore, the resistance of the concrete that is placed on its own at the temperature (500-1500°C) that will occur during the fire will be significantly reduced.

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