Abstract

Granular blast furnace slag (GS) is a glassy substance formed when the slag melted in blast furnace ironmaking is not crystallized within time. An alkaline activator can show high hydraulic hardness in an alkaline environment. Using industrial wastes such as GS and fly ash (FA) to solidify dredged sludge (DS) is an economical and environmentally friendly solution. This study investigates the effectiveness of sodium hydroxide (SH) on the strength development of cement-bound industrial waste to stabilize DS. The effects of SH content on strength, atterberg limits, cohesion, and internal friction angle were analyzed. In addition, microstructural analysis was carried out by scanning electron microscopy (SEM) and x-ray diffraction experiments (XRD). Thermal gravimetry (TG) and derivative thermal gravimetry (DTG) was carried out to analyze the decomposition properties of the stabilized soil. The results show that SH's content significantly affects the solidified DS, and the UCS of stabilized soil increases with the increase in SH content. In addition, the SH content had no noticeable effect on the cohesion between particles. However, with the increase of SH content, the internal friction angle increased significantly, improving the solidified DS's shear strength.

摘要

粒状高炉矿渣（GS）是高炉炼铁时熔化的矿渣未及时结晶而形成的玻璃状物质。碱性活化剂可以在碱性环境中表现出高水硬性。利用GS和粉煤灰（FA）等工业废物来固化疏浚污泥（DS）是一种经济且环保的解决方案。本研究探讨了氢氧化钠 (SH) 对水泥工业废料强度发展稳定 DS 的有效性。分析了SH含量对强度、阿特伯格极限、内聚力和内摩擦角的影响。此外，还通过扫描电子显微镜（SEM）和X射线衍射实验（XRD）进行了微观结构分析。采用热重分析（TG）和导数热重分析（DTG）分析稳定土的分解特性。结果表明，SH含量对固化土的DS值影响显着，稳定土的UCS随着SH含量的增加而增大。此外，SH含量对颗粒间的内聚力没有明显影响。然而，随着SH含量的增加，内摩擦角显着增加，提高了凝固DS的剪切强度。