Kendiliğinden Yerleşen Betonun İşlenebilirliğine ve Yüksek Sıcaklık Direncine Polipropilen Lifin Etkisi

Self-consolidating concrete (SCC) that provides

advantages such as high workability, low labor cost and high strength compared

to conventional concrete has high performance. The aim of this study is to

determine the effect of polypropylene fiber amount (0.25; 0.50; 0.75 and 1.00

kg/m3) on the workability and strength properties of fiber

reinforced self-consolidating concretes. Hardened samples were subjected to

temperatures of 25, 250, 500 and 750 °C. In addition, ultrasound pulse velocity

measurements were performed to obtain an idea about the void structures of the

samples. As a result of the study, it was observed that as the amount of

polypropylene fiber increased, the fluidity of the self-consolidating concrete

negatively affected, the compressive strength did not change and the tensile strength changed positively. It was determined

that the concrete compressive strength and ultrasound transition velocities

decreased in the temperatures of 500ºC and above. It has been observed that as

the temperature increased, the polypropylene fibers melted and as a result of

which, with the increase of gaps in concrete, its strength decreases. The highest

loss of strength was observed at 750ºC.

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