烧碱激发钢渣粉在淤泥质土中的试验研究

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。

Experimental study on caustic soda-activated steel slag powder in muddy soil

The steel slag powder is a powdery product formed by ball milling after the industrial waste is discharged from steelmaking. It has similar properties to those of cement, but its activity is poor and it needs to be treated. Through the laboratory tests, caustic soda (NaOH) is used as the activator of the steel slag powder to study the effect of the slag powder and cement mixed on the silty soil under different caustic soda contents. The results show that the early strength of the steel slag-cement solidified soil is low, and the curing effect is better at the later stage. After the caustic soda is added, the curing effect of the steel slag powder is obvious. The unconfined compressive strength of the steel slag-cement solidified soil increases first and then decreases with the increase of activator dosage. The X-ray diffraction (XRD) analysis shows that there is a monosulfated calcium sulphoaluminate (AFm) in the mixture, which can enhance the strength of the solidified soil.