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钢渣粉是炼钢生产后排出的工业废渣经球磨后形成的一种粉末状产物,与水泥有着相似的性质,但活性较差,需对其进行激发处理。将烧碱(Na OH)作为钢渣粉的激发剂,研究在不同烧碱掺入量下,钢渣粉与水泥混合后对淤泥质土的固化效果。试验结果表明:未掺烧碱的钢渣-水泥固化土早期强度低,后期固化效果较好;掺入烧碱之后,在其激发作用下,钢渣粉的固化效果良好且可使固化土早强。钢渣-水泥固化土的无侧限抗压强度随着烧碱掺量的增加而出现先增大后减小的变化。对胶凝材料进行X射线衍射(XRD)分析,发现材料中有单硫型硫铝酸钙(AFm)物质生成,该物质可提高固化土的强度。
Steel slag powder is a kind of powdery product formed by ball mill after industrial steel slag is discharged after steelmaking. It has the same properties as cement, but its activity is poor, so it needs to be stimulated. Sodium hydroxide (Na OH) was used as the activator of steel slag powder to study the curing effect of slag powder and cement mixed with muddy soil under different dosage of caustic soda. The test results show that the steel slag-cement soil with no caustic soda has low initial strength and good post-curing effect. After the caustic soda is added, the slag cement has good curing effect and can be hardened early. The unconfined compressive strength of steel slag-cement stabilized soil increases first and then decreases with the increase of the content of caustic soda. X-ray diffraction (XRD) analysis of the cementitious material revealed that there was a monosulfide calcium sulfite (AFm) material in the material which increased the strength of the hardened soil.