Performance of Phosphazene-Containing Polymer-Strengthened Concrete after Exposure to High Temperatures: Fid-Bau Portal

Performance of Phosphazene-Containing Polymer-Strengthened Concrete after Exposure to High Temperatures

Tanyildizi, Harun / Asilturk, Erol

The strength properties of concrete strengthened with a polymer including phosphazene after exposure to high temperatures is investigated in this study. The Taguchi $L_{25}$ ( $5^{5}$ ) method was used to reduce the number of experiments and to find the parameters affecting the experimental results. Percentage of phosphazene in the monomer (0%, 1%, 2%, 3%, and 4%), curing period (28, 60, 90, 180, and 365 days), cement content (300, 350, 400, 450, and $500 kg / m^{3}$ ), and high temperature (20°C, 200°C, 400°C, 600°C, and 800°C) were chosen as experimental parameters. For the experiments, $100 \times 100 \times 100 mm$ cubes were prepared. The specimens were removed from water after the end of predetermined curing times and dried at $105 \pm 5 ° C$ . Then, they were exposed to temperatures of 200°C, 400°C, 600°C, and 800°C. The next step was impregnation of the samples with a vinyl acetate monomer containing phosphazene for a 24-h period under atmospheric conditions. The polymerization of specimens was conducted at 60°C for 4 h. The compressive strength, ultrasonic pulse velocity, and changes in weight were determined for the specimens. Furthermore, X-ray powder diffraction (XRD), energy dispersive X-ray (EDX), and scanning electron microscope (SEM) image analyses of specimens were carried out. The findings showed that the best results were found from specimens with low cement content and 3% polymer containing phosphazene. Therefore, this study has found that polymer containing phosphazene can strengthen buildings exposed to high temperatures.