Journal of Guangdong University of Technology ›› 2017, Vol. 34 ›› Issue (05): 80-85.doi: 10.12052/gdutxb.160107

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An Experimental Study of Nansha Zinc Contaminated Sludge Solidification with Cement and Lime

Liang Shi-hua1, Luo Qi1, Wang Meng2, Liu Yong-jian1, Yin Ying-mei1, Jiang Zhi-yuan1   

  1. 1. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China;
    2. The South China Sea No.1 Flying Rescue Team, The Ministry of Transport, Zhuhai 519000, China
  • Received:2016-08-20 Online:2017-09-09 Published:2017-07-10

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Abstract: Zinc pollution sludge in Nansha (Guangzhou) was solidified and stabilized by the lime and cement. The mechanical property of solidified soil and zinc ions leaching rate were studied respectively through the unconfined compressive strength test and leaching test. The relationship of the unconfined compressive strength with the changes of lime dosage and the age has been obtained, meanwhile the relationship of the lime dosage and zinc ions leaching quantity also derived. The solidified soil samples with different ratio of composition are observed that they have different microstructure characteristics by the electronic microscope. Research shows that the strength of solidified soil has significant increase with the increasing of age and the amount of lime, and the zinc ions leaching concentration has greatly reduced. What's more, zinc ions leaching rate in the zinc pollution soil was to zero with the 15% cement+10% lime repair below 3 000 mg/kg. In conclusion, H2 (15% cement+10% lime) has better effect in curing and repairing, which is associated with the microstructure of hydration products of solidified soil.

Key words: Nansha soft soil, zinc ions, the unconfined compressive strength (UCS), leaching test, scanning electronic microscope (SEM)

CLC Number: 

  • X53
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