Research on the heat effect of various concretes

Abstract

It is known that when concrete is affected by heat, the compressive strength physically begins to decrease from about 200°C, and when it reaches 500°C, the compressive strength decreases to about half of the normal state. Chemically, it has been reported that CaCO3 is decomposed and CaO is produced in cement hydrate at 600°C or higher, and water vapor reacts with CaO in the cooling process to produce Ca (OH) 2. However, there are many studies on the relationship between concrete and heat effect at around 600°C, and little research has been conducted on heat effects above 1000°C. This research is investigating the thermal effects of various materials for the purpose of processing inorganic materials using lasers. This report describes the results of investigating the thermal effects of ordinary concrete and high-strength concrete when an electric furnace is used as a substitute for a laser and the conditions of heating temperature and heating time are changed.