摘要
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。
The volume stability of steel slag aggregate for road basecourse is disscussed. Steel slag granular aggregate/mixture expension is calculated based on f-CaO hyration pattern, and immersing-cracking test on diffenrent binder-treated mixture is conducted. Caculation based on f-CaO expension model proves that steel slag expension is influenced by f-CaO content, size of aggregate and specific gravity,which suggest that steel slag of larger size has poor stability. Completely 1% f-CaO hydration raises 1.15% expension of sleel slag. 80℃ water bathed test proves the caculation is well matched with the real expension with 6.11% error. Conclusion could be drawn through immersing-cracking test that mixture failure occurs locally and superior scourresistence enhances the volume stability. Lime-fly ash teated mixture is superior to cement treated mxiture in scourresistence while suspension gradation mix is superior to skeloton gradation mix. Cement treated mix in suspension gradtion shows best volume stabiliy, and more than 3% cement is recommanded. Volume stability of steel slag for road basecourse aggreage should be evaluated based on the maximum expension of local granular steel slag, not the whole mix.
出处
《公路》
北大核心
2013年第4期169-174,共6页
Highway
基金
湖南省交通运输厅2009年度科技进步与创新项目
项目编号200914
长湘高速公路资源节约型和环境友好型科技示范工程项目
项目编号CXKJSF0202
关键词
钢渣
基层
膨胀机理
体积安定性
steel slag
basecourse
expension mechanism
volume stability
