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采用水泥作为固化剂对锌污染高岭土进行固化稳定处理,对固化后养护7 d和28 d的人工锌污染土的液塑限特性、无侧限抗压强度和变形模量特性、土样pH特性,以及微观机理进行了研究。结果表明,液塑限随锌离子浓度增加而降低。随锌离子浓度增加,固化污染土的无侧限抗压强度值总体均呈下降趋势;随试样pH值升高,无侧限抗压强度值增大;变形模量E50均随锌离子浓度增大而减小;水泥的主要水化产物的数量均随锌离子浓度的增加而减少,且由成熟形态向早期形态退化,并最终消失。随着锌离子浓度的增加,试样中的直径1～10μm的孔隙数量明显增加,并且伴随着直径0.01～1μm的孔隙数量的减小。
Cement was used as a curing agent to cure and stabilize zinc-contaminated kaolin. The effects of liquid-plastic limiting properties, unconfined compressive strength and modulus of deformation, soil pH characteristics of artificial zinc-contaminated soils cured for 7d and 28d , And micro-mechanisms were studied. The results show that the liquid-plastic limit decreases with the increase of zinc ion concentration. With the increase of zinc ion concentration, the unconfined compressive strength values of cured soils generally show a decreasing trend. With the increase of pH value, the unconfined compressive strength value increases. The deformation modulus E50 increases with the increase of zinc ion concentration Increases and decreases; the quantity of the main hydration products of cement decreases with the increase of zinc ion concentration, and it degenerates from the mature form to the early form, and eventually disappears. With the increase of zinc ion concentration, the number of pores with the diameter of 1 ~ 10μm increased obviously in the sample, accompanied by the decrease of the number of pores with the diameter of 0.01 ~ 1μm.