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通过建立f-CaO粒子水化膨胀模型以计算钢渣颗粒/混合料膨胀率,按不同配合比进行无机结合料稳定类混合料崩解试验,探讨了钢渣作为基层集料的体积安定性。f-CaO粒子水化膨胀模型计算结果显示,钢渣膨胀特性与f-CaO含量、钢渣颗粒大小及钢渣密实度有直接关系,钢渣颗粒越大体积安定性越差。1%的f-CaO完全水化增加钢渣1.15%膨胀率。80℃水浴试验结果表明模型计算与实际钢渣粒料膨胀率吻合程度较好,平均误差为6.11%。混合料崩解试验结果表明,无机结合料稳定钢渣膨胀破坏为局部破坏,其抗冲刷性能越好其体积安定性越佳,抗冲刷性能水泥稳定类优于二灰稳定类,悬浮级配优于骨架级配。水泥悬浮钢渣体积安定性最佳,水泥剂量不宜低于3%。钢渣作为路用基层集料的体积安定性宜按照钢渣粒料可能发生的最大膨胀率而非整体膨胀率评价。
By establishing hydration expansion model of f-CaO particles to calculate the expansion rate of steel slag particles / mixture, the stability test of inorganic binder stabilized materials was carried out according to different compounding ratios, and the volume stability of steel slag as base aggregate was discussed. The results of f-CaO particle hydration expansion model show that the expansive property of steel slag is directly related to f-CaO content, steel slag particle size and steel slag densification. The larger the steel slag particle, the worse the volume stability. Complete hydration of 1% f-CaO increases the 1.15% expansion of slag. The results of 80 ℃ water bath show that the model calculation is in good agreement with the actual steel slag pellet expansion rate with an average error of 6.11%. The results of the disintegration test of the mixture show that the inorganic binder stabilizes the expansion and destruction of the steel slag as partial destruction, and the better the anti-erosion performance is, the better the volume stability is. The anti-erosion property is better than the ash-stabilized type for cement stability, Skeleton grade. The volume stability of cement suspended slag is the best, the dosage of cement should not be less than 3%. The volume stability of steel slag as road aggregate should be evaluated according to the maximum expansion rate of steel slag pellets rather than the overall expansion rate.