Performance of Phosphazene-Containing Polymer-Strengthened Concrete after Exposure to High Temperatures
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 12
Abstract
The strength properties of concrete strengthened with a polymer including phosphazene after exposure to high temperatures is investigated in this study. The Taguchi () 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 ), and high temperature (20°C, 200°C, 400°C, 600°C, and 800°C) were chosen as experimental parameters. For the experiments, cubes were prepared. The specimens were removed from water after the end of predetermined curing times and dried at . 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.
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Acknowledgments
This study was supported by the Scientific and Technological Research Council of Turkey (TUBITAK Project No. 113M448). The authors gratefully acknowledge the TUBITAK.
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©2018 American Society of Civil Engineers.
History
Received: Sep 19, 2017
Accepted: May 21, 2018
Published online: Oct 4, 2018
Published in print: Dec 1, 2018
Discussion open until: Mar 4, 2019
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