电石渣激发矿渣改良铅污染土工程特性试验研究
发布时间：2018-12-14 19:40
【摘要】：采用电石渣和矿渣等工业废料对Pb污染土进行改良,通过对电石渣联合矿渣改良Pb污染土的无侧限抗压强度、压缩特性、水稳系数、Pb离子浸出浓度进行试验性研究,并通过微观扫描电镜对改良路基土的机理进行佐证分析。试验结果表明:在相同集料掺量下,改良未污染土的无侧限抗压强度qu高于Pb污染土;经15%~25%集料改良之后的孔隙比,较Pb污染黏土孔隙比小;改良Pb污染土的水稳系数低于改良未污染土;相同集料掺量作用下,浸出液中Pb2+浓度随着养护龄期增长而降低;矿渣在电石渣生成的碱性环境下,发生水化反应形成大量致密的水化硅酸钙C-S-H网状结构产物。
[Abstract]:Pb contaminated soil was improved by industrial waste such as carbide slag and slag. The unconfined compressive strength, compression characteristic, water stability coefficient and Pb ion leaching concentration of Pb contaminated soil improved by calcium carbide slag combined with slag were studied experimentally. The mechanism of improved subgrade soil was analyzed by SEM. The results show that the unconfined compressive strength (qu) of the modified uncontaminated soil is higher than that of the Pb contaminated soil under the same aggregate content, and the porosity ratio of the modified uncontaminated clay is smaller than that of the Pb contaminated clay after 15% aggregate improvement. The coefficient of water stability of improved Pb contaminated soil is lower than that of unpolluted soil, and the concentration of Pb2 in leaching solution decreases with the increase of curing age under the same aggregate content. A large number of dense hydrated calcium silicate (C-S-H) network products were formed by hydration reaction of slag in alkaline environment generated by calcium carbide slag.
【作者单位】： 青岛理工大学(临沂);
【基金】：国家自然科学基金项目(51409154)
【分类号】：TU43
本文编号：2379204
[Abstract]:Pb contaminated soil was improved by industrial waste such as carbide slag and slag. The unconfined compressive strength, compression characteristic, water stability coefficient and Pb ion leaching concentration of Pb contaminated soil improved by calcium carbide slag combined with slag were studied experimentally. The mechanism of improved subgrade soil was analyzed by SEM. The results show that the unconfined compressive strength (qu) of the modified uncontaminated soil is higher than that of the Pb contaminated soil under the same aggregate content, and the porosity ratio of the modified uncontaminated clay is smaller than that of the Pb contaminated clay after 15% aggregate improvement. The coefficient of water stability of improved Pb contaminated soil is lower than that of unpolluted soil, and the concentration of Pb2 in leaching solution decreases with the increase of curing age under the same aggregate content. A large number of dense hydrated calcium silicate (C-S-H) network products were formed by hydration reaction of slag in alkaline environment generated by calcium carbide slag.
【作者单位】： 青岛理工大学(临沂);
【基金】：国家自然科学基金项目(51409154)
【分类号】：TU43
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