关键词: 高温;聚丙烯高性能混凝土;钢筋损伤;锈蚀电位值

Abstract: In order to study the damage of steel bars in high performance concrete after high temperature effect, the Half-cell potential method was used to detect the corrosion potential of the internal reinforcement of C60 high performance concrete,which mixed with and without polypropylene fiber and after a different temperature effect.The results show that steel corrosion potential value in the plain concrete and polypropylene fiber reinforced concrete generally have little difference with the increase of temperature.The change rule of absolute value is as follows: In the range of 20-500 ℃, the absolute value of the corrosion potential increases with temperature; In the range of 500-700 ℃, the absolute value of the corrosion potential is almost unchanged with the temperature rise; The reinforcement diameter and the different cooling method have little effect on the corrosion potential value of the steel inside the concrete.

Key words: high temperature;polypropylene high performance concrete;reinforcement damage;rust potential