包钢高炉渣改良回填料抗剪强度试验研究

包钢高炉渣的放射性、稳定性等均满足规范要求,可以用于建筑地基填料、道路基层材料.通过室内试验发现,原矿渣级配不良,缺少细料的填充,不能直接用于地基填料,向高炉渣中添加不同比例的粉煤灰和砂土,进行级配改良.对改良后的混合料进行了大型直剪试验,研究P5含量与粘聚力及内摩擦角的变化规律.主要结论包括：P5含量在60％～75％之间时,填料的抗剪强度最大;添加砂土的填料级配优于只添加粉煤灰的,且P5为68％时密实度最好、抗剪强度最大;P5 =65％ ～70％之间的砂土填料配比最优.

Study on shear strength test of backfill improved by using blast furnace slag of Baotou Iron and Steel (Group) Co.

The properties of blast furnace slag of Baotou Iron and Steel （Group） Co. like radioactive, stability , etc. meet the require- ments of specification, so it can be used as building material for foundations and road base. Laboratory tests showed that the original slag is poorly graded and lack of fine material filling, which is not suitable to be directly used for foundation packing. Gradation was improved by adding different proportions of fly ash and blast furnace slag sand. The direct shear tests were conducted using the improved mixture to research the regular P5 content and the cohesion and internal friction angle. The main conclusions are as follows ： the fillers have the maximum shear strength when P5 ratio is between 60% and 75%. The gradation of adding the sand filler is better than that of adding the fly ash, reaching maximum using sand filler with P5 at 68% . The optimal ratio of the sand filler was obtained when P5 is between 65% and 70%.