Mechanical properties of high-strength micro steel fibre reinforced concrete subjected to high temperatures

Abstract

The concrete structure deteriorates as a result of numerous chemical changes that occur when subjected to extremely high temperatures. To reduce structural components, catastrophic failure due to elevated temperature exposure by adding fibres into the matrix, which increases the time inhabitants have to evacuate during accidental fires, is the principal purpose of this experimental work. In addition, whenever the structures are subjected to fire, one end of the structure may catch on fire while the other end may not, but both ends of the structure can get subjected to extremely high temperatures, analogous to the exposure to the furnace.After repeated heating and cooling, and concrete loses strength in application scenarios. Investigational work has been done on concrete with micro steel fibre with volume fraction varying from0 to 0.5%. For quality assessment, non-destructive testing (NDT) has been performed both before and after temperature exposure. A model has been developedthat can predict compressive strength values from the obtainedultrasonic pulse velocity values. According to this research, adding steel fibre demonstrated good strength results post-elevated temperature exposure. This research attempts to quantify the post-fire mass loss, strength degradation, and quality deterioration of high-strength micro steel fibre reinforced concrete after it has been exposed to elevated temperatures.