矿物掺和料对混凝土疲劳性能的影响

Effects of Mineral Admixtures on Fatigue Behavior of Concrete

关键词:  矿物掺和料,混凝土,高周疲劳,低周疲劳

Key words:  mineral admixture,concrete,high-cycle fatigue behavior,low-cycle fatigue behavior

摘要:

测试了分别用30%,50%(质量分数,下同)粉煤灰,30%,50%,80%磨细矿渣等量替代水泥的混凝土抗弯疲劳性能,并结合混凝土疲劳破坏机制分析了矿物掺和料对混凝土疲劳性能的影响机理.结果表明,矿物掺和料改善了混凝土界面过渡区结构,从而提高了混凝土疲劳强度折减系数,改善了混凝土的高周疲劳性能;矿物掺和料对混凝土低周疲劳性能的影响取决于它们对混凝土强度的影响.

Abstract:

To understand effects of mineral admixtures on fatigue behavior of concrete,fatigue behavior of concrete with 30%,50%(by mass) fly ash and with 30%,50%,80%(by mass) blast furnace slag under flexural fatigue load were tested.Results show that fatigue strength corresponding to 2 000 000 cycles increases with the increase of cement replacement level by mineral admixtures.Mineral admixtures can exert benefitial effect on high-cycle fatigue behavior of concrete for the improvement of interfacial transition zone,as for low-cycle fatigue behavior,effect of mineral admixtures depend on their influence on concrete strength.