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钢渣作为炼钢副产品,是一种潜在的优质筑路材料。以舞钢电炉钢渣为研究对象,在系统分析其稳定性的基础上,对不同陈化龄期、不同压实度、不同级配钢渣进行加州承载比(CBR)与无侧限抗压强度测试,分析其用于高速公路路床铺筑的可行性。结果表明,无论是f-CaO含量、粉化率还是CBR浸水膨胀率,舞钢钢渣均满足规范的相关要求,具备较好的稳定性能与工程应用的可行性。陈化龄期为0个月和8个月、不同配合比钢渣在92%、96%和100%压实度下,CBR值均远大于规范对路床材料CBR值8%的要求。陈化龄期8个月钢渣配合比为3(0~0.6mm)∶7(0.6~4.75mm)与5∶5时,其7d无侧限抗压强度与4%石灰土基本相同,可以代替石灰土应用于高速公路路床。以高速公路路床采用4%石灰土的强度性能为对比,综合考虑钢渣稳定性与工程施工成本,建议选用陈化龄期为8个月、配合比为3∶7的钢渣。最后,对钢渣强度形成机理进行了分析。
Slag, as a byproduct of steelmaking, is a potential high-quality road building material. Taking the steel slag of Wugang EAF as the research object, based on the systematic analysis of its stability, the CBR and unconfined compressive strength tests of steel slags with different aging ages, different compaction degrees and different grades were tested and analyzed It is used for the feasibility of paving the highway bed. The results show that both the f-CaO content, the pulverization rate and the CBR water swelling rate of Wugang steel meet the requirements of the code, and have good stability and feasibility of engineering application. The aging ages are 0 months and 8 months. The CBR values of the steel slag with different compounding ratios at 92%, 96% and 100% compaction degrees are far greater than the requirements of the code for CBR value of 8% on roadbed materials. When the steel slag mixture ratio is 3 (0 ~ 0.6mm): 7 (0.6 ~ 4.75mm) and 5: 5, the unconfined compressive strength at 7d is the same as that of 4% Used in the highway roadbed. Considering the strength performance of 4% limestone soil for highway roadbed as a contrast, considering the stability of steel slag and the construction cost, it is suggested to choose steel slag with the aging age of 8 months and the mixing ratio of 3: 7. Finally, the formation mechanism of steel slag strength was analyzed.