Influence of Steel Slag Beads Substituting Fine Aggregate on Durability of Concrete
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摘要: 钢渣微珠是压缩空气以高速射流冲击液态钢渣迅速冷却凝固而成的钢渣副产品。将钢渣微珠作为混凝土细骨料替代品,研究了不同钢渣微珠细骨料替代率(0%、20%、35%、50%)对混凝土耐久性的影响。结果表明:钢渣微珠替代天然河砂后,对混凝土的抗硫酸盐侵蚀性能产生不利影响,60次干湿循环时,50%替代率的钢渣微珠混凝土耐蚀系数低于75%;钢渣微珠混凝土的抗冻融性能优于普通混凝土,且与钢渣微珠替代率成正比;钢渣微珠对混凝土抗碳化性能的提高有促进作用。Abstract: Steel slag beads are a by-product of steel slag formed by direct gas quenching of liquid steel slag.In this paper,steel slag beads were used as substitutes for fine aggregate of concrete,and the influences of substitution rates（0%,20%,35%,and 50%） of steel slag beads for the fine aggregate on the durability of concrete were studied.The results show that the corrosion resistance of the concrete is adversely affected by the steel slag beads substituting natural sand.The corrosion resistance coefficient with 50% replacement rate of steel slag beads is lower than 75% after 60 dry and wet cycles.Moreover,the freezing-thawing resistance of steel slag bead concrete is better than that of the ordinary concrete,and it is proportional to the substitution rate of steel slag beads.The steel slag beads can improve the carbonization resistance of the concrete.
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Key words:
- steel slag beads /
- concrete /
- fine aggregate /
- durability
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