The goals of this paper are to study the frost resistance of steel slag fine concrete(SSFC),re-search the damage mechanisms in cold regions.First,the mass loss rate,strength loss rate,relative dynamic elastic modulus of concrete with different steel slag fine aggregate replacement rates after freezing-thawing cycles were tested,and the freezing-thawing damage law was analyzed.Scanning electron microscopy meth-od was used to observe the hydration products of steel slag concrete and the steel slag-mortar interface transition zone for the analysis of freezing-thawing damage microscopic mechanisms.The results revealed that the steel slag fine aggregate is significantly damaged by freezing-thawing action.Interfacial transition zone of steel slag fine concrete is superior to that of ordinary concrete.The minimum mass and strength loss of concrete at 60％replacement rate of steel slag fine concrete,only 4.06％and 44.2％reduction,re-spectively.The highest mass and strength loss rates of concrete are 6.05％and 58％,respectively,with 100％replacement of steel slag fine concrete.When the number of freeze-thaw cycles is greater than 50,the relative dynamic elastic modulus of concrete with 60％of steel slag fine concrete is higher than the rest of the dosing group.In order to improve the performance of concrete under freezing-thawing cycles,60％replacement rate of steel slag fine concrete is recommended.Finally,the freezing-thawing damage evolution model of steel slag concrete was established by analyzing the damage evolution s of steel slag concrete specimens.
关键词
钢渣混凝土/水化产物/强度损失/相对动弹性模量/损伤模型
Key words
steel slag concrete/hydration products/strength loss/relative dynamic modulus of elasticity/damage model
维普
万方数据