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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。
The Pb-contaminated soil was modified by industrial waste such as carbide slag and slag. The unconfined compressive strength, compressive property, water stability coefficient and Pb ion leaching concentration of Pb-contaminated soil modified by carbide slag combined with slag were studied experimentally. The microscopic scanning electron microscopy is used to analyze the mechanism of improving subgrade soil. The experimental results show that the unconfined compressive strength (qu) of unmodified soils is higher than that of Pb soils at the same aggregate content. The void ratio after 15% ~ 25% The water stability coefficient of modified Pb-contaminated soil is lower than that of the modified uncontaminated soil. The concentration of Pb2 + in leachate decreases with the increase of curing age under the same aggregate content. The slag occurs in alkaline environment generated by carbide slag Hydration reaction to form a large number of dense hydrated calcium silicate CSH reticular product.