The bond strength by pull-off and direct tensile strength of concrete damaged by elevated temperatures

Construmat 2018

Rozsypalova, I.^1 ; Danek, P.^1 ; Karel, O.^1

Department of Building Testing, Faculty of Civil Engineering, Brno University of Technology, Veveri 95, Brno

602 00, Czech Republic^1

关键词: Concrete panels;    Direct tensile strengths;    Elevated temperature;    High temperature;    Monitored parameters;    Pull-off tests;    Strength of concrete;    University of technologies;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/385/1/012047/pdf
DOI  :  10.1088/1757-899X/385/1/012047

来源: IOP

【 摘 要 】

This paper presents the results of an experimental study of selected characteristics of concrete following its exposure to high temperatures. The monitored parameter was the influence of high temperatures on the bond strength and tensile strength of concrete. The bond strength was tested by a pull-off test, the tensile strength was determined as the direct tensile strength. Experimental concrete panels of 2300 × 1300 × 150 mm were exposed to high temperatures (corresponding to the temperatures in a normal fire) using a fire test furnace at the AdMaS Science Centre of the Faculty of Civil Engineering, Brno University of Technology. The direct tensile strength test was performed on cylinders (diameter of 100 mm and length of 100 mm) made from core samples taken from the panel. The pull-off test was performed on the surface exposed to high temperatures. The results of the experiment show a significant influence of high temperatures on the examined characteristics, and both characteristics were found to significantly decrease with a growing thermal load.