掺不同品种混合材的高强砼与钢纤维高强砼在冻融、冻融-氯盐同时作用下的耐久性能

Durability of High Strength Concrete and Steel Fiber Reinforced High Strength Concrete with Different Kinds of Additive under Effect of Freeze-than or Freeze-thaw Together with Chloride

采用快冻试验方法 ,研究了掺量分别为20%粉煤灰、硅灰以及磨细矿渣的高强混凝土(HSC)与钢纤维高强混凝土(SFRHSC) ,在标准养护室内浸水养护90天的抗冻性 ,以及在氯盐侵蚀与冻融循环双重因素作用下的抗冻耐久性。试验结果表明 ,在单纯冻融循环作用下 ,掺入硅灰能够提高HSC和SFRHSC的抗冻性 ,而掺磨细矿渣和粉煤灰则不能 ;在冻融循环与氯盐侵蚀同时作用下 ,掺入硅灰和磨细矿渣 ,能显著提高HSC和SFRHSC的抗冻性能 。

After 90 day's curing in 20℃ water, through accelerated freeze-thaw test, the frost resistance of HSC and SFRHSC specimens, with 20% weight of fly ash, silica fume or ground granulated blast furnace slag (GGBFS), were strdied. The experimental results show that addition of silica fume can improve the frost resistance of HSC and SFRHSC, but addition of fly ash or GGBFS can't. Under the simultaneous action of freeze-thaw cycles and chloride corrosion, the addition of silica fume or GGBFS can increase the frost resistance of HSC and SFRHSC, but addition of fly ash will decrease the frost resistance of HSC and SFRHSC.