Volume 37 Issue 4
Aug.  2023
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Article Navigation >  GEOTECHNICAL ENGINEERING TECHNIQUE  > 2023  >  37(4): 455-460
Wang Kuangshan, Pang Long, Dai Zhenxin, Zhang Hui, Zhang Xinjun. Study on Environmental Durability of Solidified Lake-bottom Sediment[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2023, 37(4): 455-460. doi: 10.3969/j.issn.1007-2993.2023.04.014
Citation: Wang Kuangshan, Pang Long, Dai Zhenxin, Zhang Hui, Zhang Xinjun. Study on Environmental Durability of Solidified Lake-bottom Sediment[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2023, 37(4): 455-460. doi: 10.3969/j.issn.1007-2993.2023.04.014
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Study on Environmental Durability of Solidified Lake-bottom Sediment

doi: 10.3969/j.issn.1007-2993.2023.04.014
  • 1.

    PowerChina Huadong Survey, Design and Research Institute Co., Ltd., Hangzhou 310000, Zhejiang, China

  • 2.

    China Railway First Bureau Group Co., Ltd., Xi’an 710000, Shaanxi, China

  • Received Date: 2022-05-23
  • Accepted Date: 2022-12-09
  • Rev Recd Date: 2022-08-14
  • Publish Date: 2023-08-08
    Abstract
  • In order to evaluate the environmental durability of solidified lake-bottom sediment, alkali activated cementing material of slag system (slag powder, metakaolin, lime and sodium silicate) and traditional cement were used as curing agent. Through unconfined compression, freezing-thawing cycle, Na2SO4 and NaCl erosion leaching, scanning electron microscopy and EDS-Mappingtests, the typical hydrates, strength evolution, mass loss rate and microstructure characteristics of solidified sediment in erosion environment were analyzed. The results show that a large amount of hydrated sodium silicate aluminate gel（N-A-S-H）was formed in the alkali-excited solidified sediment. The freezing-thawing cycle and erosion leaching can lead to the deterioration of the strength of solidified sediment. The development of ettringite led to expansion and cracking when the cement-solidified sediment was eroded by sulfate, which resulted in the decrease of strength. The alkali-activated curing agent has better chloride ion resistance than sulfate ion and better comprehensive environmental durability than conventional Portland cement.

     

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