改性铁尾矿微粉对中高强混凝土性能的影响研究
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1.安徽马钢矿业资源集团姑苏矿业有限公司;2.北京科技大学

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TD528

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Influence of modified iron tailing powder on the properties of medium and high strength concrete
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Gushan Mining Company,MasteelGroupHolding Co,Ltd

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    摘要:

    将不同掺量的改性铁尾矿微粉完全替代粉煤灰做矿物掺合料制备C50混凝土,并设置与铁尾矿微粉等掺量的粉煤灰组为对照,研究改性铁尾矿微粉对中高强混凝土抗压强度、工作性能和耐久性能的影响。结果表明:改性铁尾矿微粉混凝土具有较好的工作性能;抗压强度随改性铁尾矿微粉掺量的增加而降低,各组较对应的粉煤灰对照组强度略低,相差范围在3.7-4.6MPa内,改性铁尾矿微粉在掺量为矿物掺合料总量的30%-60%时均满足C50混凝土的抗压强度要求。改性铁尾矿微粉在掺量为矿物掺合料总量的40%-60%时,抗碳化性能随铁尾矿粉掺量的增加先增强后减弱,与粉煤灰对照组基本持平;抗渗透性能随铁尾矿粉掺量增加而减弱,但抗渗等级均能与粉煤灰对照组一致,为“非常低”;抗硫酸盐侵蚀性能、抗冻性能均随铁尾矿粉掺量增加而增强,抗硫酸盐等级可以达到KS180,抗冻等级均可达到F300,且均优于粉煤灰对照组。综合看来改性铁尾矿微粉在掺量为矿物掺合料总量的40%-60%时可替代粉煤灰应用于中高强混凝土中。

    Abstract:

    In order to study the effect of modified iron tailing powder on the compressive strength、working performance and durability of medium and high strength concrete, the C50 concrete were produced by different amounts of modified iron tailing powder, which completely replacing fly ash as the mineral admixture. The fly ash group with the same amount of iron tailing powder was set as a control group. The results show that the modified iron tailing powder concrete has better working performance, and the 28d compressive strength of modified iron tailing powder concrete decreases with the increase of modified iron tailing powder content. When the amount of tailing powder in total mineral admixture is 30%-60%, it can meet the compressive strength requirements of C50 concrete. When the content of modified iron tailing powder is 40%-60%, the anti-carbonation performance first increases and then weakens with the increase of tailing powder content, which is basically the same as that of the fly ash control group; the anti-permeability performance weakens with the increase of tailing powder content, but the anti-permeability grades can be consistent with the fly ash control group, which is "very low"; the anti-sulfate erosion performance and anti-freezing performance are enhanced with the increase of tailing powder content; the sulfate resistance grade can reach KS180, the antifreeze grade can reach F250, and all are better than the fly ash control group. In general, the modified iron tailing powder can be used in medium and high strength concrete instead of fly ash when the dosage of total mineral admixture is 40%-60% .

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  • 收稿日期:2022-04-24
  • 最后修改日期:2022-05-13
  • 录用日期:2022-05-15
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