Abstract: In order to study the mechanical, thermophysical properties and micro characteristics of slag concrete under high temperature conditions, the compressive strength, mass loss rate, DSC thermal analysis and infrared spectroscopy of slag concrete under different temperature conditions are measured or made. The results show that as the temperature continues to rise, the heat change law of slag concrete shows a trend of first decreasing, then increasing, and then decreasing. When the temperature is less than 500 ℃, the FTIR curve of slag concrete changes basically the same. But when the temperature is higher than 500 ℃, the FTIR curve of slag concrete shows obvious changes within the wave number of 750~620 cm^-1

Key words:  , compressive strength, mass loss rate, DSC thermal analysis, infrared spectroscopy, natural cooling, slag