超细地聚合物对河湖疏浚淤泥固化和重金属固结效果的影响  

Effect of ultrafine geopolymer on solidification and heavy metal consolidation of dredged silt in rivers and lakes

作　　者：梁远博[1] LIANG Yuanbo(CCCC Shanghai Third Harbor Engineering Science and Technology Research Institute Co.,Ltd.,Shanghai 200032,China)

机构地区：[1]中交上海三航科学研究院有限公司,上海200032

出　　处：《水运工程》2024年第3期15-19,37,共6页Port & Waterway Engineering

摘　　要：我国每年河湖疏浚产生大量废弃淤泥,这些淤泥固结周期长、固化强度低且含有大量重金属,难以进行资源化利用。采用超细偏高岭土地聚合物,研究其对淤泥固化强度、水稳系数和重金属固结效果的影响。结果表明:随着超细地聚合物掺量增加,淤泥固化土的强度逐渐增大,7 d无侧限抗压强度可达1.68 MPa,具有优异的淤泥固化效果;水稳系数先增大后减小,掺入超细偏高岭土的淤泥固化土水稳系数均达到了90%以上,是纯淤泥土的两倍以上。超细地聚合物对镉、铅等6种重金属离子均具有良好的固结效果,尤其是对镉和汞的固结作用最为显著,且各组淤泥固化土中6种重金属元素浸出量均未超过相关标准的要求。超细地聚合物对淤泥具有良好的固化和重金属固结效果,与普通硅酸盐水泥固化材料有较大区别。The dredging of rivers and lakes in China produces a large amount of waste silt every year,which has long consolidation period,low curing strength and heavy metals,and is difficult to be used as resources.In this paper,ultrafine metakaolin geopolymer is used to study its influence on the solidification strength,water stability coefficient and heavy metal consolidation effect of the silt.The results show that with the increase of ultrafine geopolymer content,the strength of silt solidified soil gradually increases,and the 7 d unconfined compressive strength can reach 1.68 MPa,which has excellent silt solidifying effect.The water stability coefficient increases first and then decreases,and the water stability coefficient of the silt solidified soil mixed with ultrafine metakaolin is more than 90%,which is more than twice that of the pure silt soil.The ultrafine geopolymer has good consolidation effect on 6 kinds of heavy metal ions such as cadmium and lead,especially on cadmium and mercury,and the leaching amount of 6 heavy metal elements in each group of silt solidified soil does not exceed the requirements of relevant standards.The solidification and heavy metal consolidation effect of the ultrafine geopolymer on the silt is good,which is quite different from the ordinary Portland cement solidifying material.

关 键 词：超细地聚合物 淤泥固化 水稳系数 重金属固结 

分 类 号：U616[交通运输工程—船舶及航道工程]