Resumen de Effects of plasticizer and antifreeze on concrete at elevated temperatures and different cooling regimes
İlknur Bekem Kara, Metin Arslan
In this study, the plasticizer and the antifreeze were used. The concrete specimens (the reference concrete without an admixture, concrete with plasticizer, concrete with antifreeze and concrete with plasticizer+antifreeze) were exposed to elevated temperatures (200, 400, 550 and 700 ºC) and cooling via air and water. Water absorption, ultrasonic pulse velocity and compressive strength tests were performed on the specimens. The concrete specimens were also analyzed using thermal gravimetric analysis and X-ray diffraction. The test results indicated that at the temperatures of 550 and 700 ºC and against both of the cooling regimes the plasticizer+antifreeze concrete showed a maximum strength loss. When the air cooled specimens were examined, the lowest strength loss was this obtained for reference concrete at 550 and 700 ºC. The lowest strength loss at these temperatures for the water cooled specimens was observed in the concrete with antifreeze. According to thermal gravimetric analysis, the weight loss rate slightly decreases after 700 °C. No portlandite peaks were observed in the concrete mixtures exposed to 700 ºC and the cooling regimes was when they were compared at with the control specimens exposed to 20 ºC in the X-ray diffraction analysis.
