铁尾矿微粉对混凝土收缩及耐久性能的影响

Effect of iron tailings powder on shrinkage and durability of concrete

为明确铁尾矿微粉对混凝土变形和耐久性的影响,研究了铁尾矿微粉作为混凝土低活性掺合料不同比例替代粉煤灰对混凝土收缩及部分耐久性的影响.试验结果表明:铁尾矿微粉在适宜掺量下替代粉煤灰,可以较好发挥填充的作用,减少混凝土微观缺陷,改善混凝土抗冻融、抗硫酸盐侵蚀性,并能使混凝土孔结构得到改善。

In order to clarify the effect of iron tailings powder on the deformation and durability of concrete,the effect of iron tailings powder replacing fly ash in different proportions as low active admixture of concrete on shrinkage and partial durability of concrete was studied.The test results show that the iron tailings fine powder can replace the fly ash under suitable dosage,which can play a better filling role,reduce concrete micro-defects,improve the freeze-thaw resistance and sulfate resistance of concrete,and improve the pore structure of concrete.