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

AbstractThe strength properties of concrete strengthened with a polymer including phosphazene after exposure to high temperatures is investigated in this study. The Taguchi L25 (55) method was used to reduce the number of experiments and to find the parameters affecting the experimental results. Per...

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Bibliographic Details
Published in:Journal of materials in civil engineering 2018-12, Vol.30 (12)
Main Authors: Tanyildizi, Harun, Asilturk, Erol
Format: Article
Language:English
Subjects:
Building materials
Civil engineering
Compressive strength
Cubes
Curing
Monomers
Parameters
Phosphazene
Polymers
Taguchi methods
Technical Papers
Vinyl acetate
Weight
X ray powder diffraction
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Summary:AbstractThe strength properties of concrete strengthened with a polymer including phosphazene after exposure to high temperatures is investigated in this study. The Taguchi L25 (55) 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/m3), and high temperature (20°C, 200°C, 400°C, 600°C, and 800°C) were chosen as experimental parameters. For the experiments, 100×100×100  mm cubes were prepared. The specimens were removed from water after the end of predetermined curing times and dried at 105±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.
ISSN:0899-1561
1943-5533
DOI:10.1061/(ASCE)MT.1943-5533.0002505