摘要:
针对钢渣体积膨胀导致在工程应用中稳定性较差的问题,依据游离氧化钙(f-CaO)的水化反应理论,运用乙酸浸泡与掺入微硅粉两种方法来降低钢渣的体积膨胀率。乙酸溶液体积分数为10%、15%、20%;微硅粉掺量为0.6%、1.2%、2.4%、4.8%。研究结果表明,两种方法均能有效降低钢渣的体积膨胀率,其改善效果与试剂掺量呈正相关;在乙酸浸泡组中,浸泡3 h就能完全发挥作用,各组降低幅度均在76.1%以上;在加微硅粉的组中,不同掺量下膨胀率降低幅度差异明显,当微硅粉掺入量超过2.4%时,膨胀率值会降低至2%以下,当掺入量为4.8%时,膨胀率值为0.4%,降低幅度高达87.1%。
关键词:
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钢渣 /
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游离氧化钙 /
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乙酸 /
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微硅粉 /
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体积膨胀率
Abstract:
In view of the poor stability in engineering application of steel slag caused by the volume expansion,the methods of acetic acid immersion and micro-silicon powder addition were adopted to reduce the volume expansion ratio of steel slag according to the hydration reaction mechanism of free calcium oxide（f-CaO）.The volume fraction of acetic acid solution was controlled at 10%,15% and 20%,and the proportion of micro-silicon powder was 0.6%,1.2%,2.4% and 4.8%,respectively.The results show that both of the methods can effectively reduce the volume expansion ratio of steel slag,and its effect is positively correlated with the reagent proportion.In the acetic acid immersion group,soaking for 3 h is enough for full function,and more than 76.1% of reduction for volume expansion ratio can be obtained for each experiment.In the group of micro-silicon powder addition,obvious difference on reduction of expansion ratio of the steel slag can be found for different micro-silicon powder addition.When the micro-silicon powder proportion is more than 2.4%,the volume expansion rate reduces to less than 2%,and an expansion ratio of 0.4% corresponding to 87.1% of reduction can be obtained with the proportion of micro-silicon powder at 4.8%.
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