Abstract
In this paper, the mixture proportion of reactive powder concrete was determined by formula method. The dynamic mechanical behavior of reactive powder concrete and ordinary concrete at three kind of over - temperature 20℃, 300℃ and 800℃ were analyzed and compared. Besides, the energy mechanism of reactive powder concrete was analyzed. The results showed that the dynamic compressive strength of the reactive powder concrete increased with the increment of the strain rate under different temperatures, and the change of the peak strain was not obvious when the temperature and strain rate changed. With the increment of temperature, the dynamic compressive strength of reactive powder concrete gradually decreased. The stress- strain curves of the active powder concrete did not show a significant elastic interval. The stress and strain of ordinary concrete were almost the same with those of reactive powder concrete under different temperature, but the dynamic compressive strength was obviously smaller than that of reactive powder concrete, which reflected the high performance and excellent durability of reactive powder concrete. The energy mechanism of the reactive powder concrete showed that the bigger the strain rate is, the more energy is absorbed by the specimen. Under the similar strain rate, the higher the over-temperature is, the less energy is absorbed by the specimen.
