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Experimental study on the use of compound alkaline materials to solidify lake sediments

Author(s):



Medium: journal article
Language(s): English
Published in: PCI Journal, , n. 5, v. 68
DOI: 10.15554/pcij68.5-03
Abstract:

The disposal of lake sediment is a major problem in dredging and lakeside construction projects. Due to its poor mechanical properties and contamination, sediment is difficult to use directly in resource appli¬cations. Previous research has found that alkali-acti¬vated reactions can improve the mechanical properties of silicon- and aluminum–rich solid waste. In this study, the basic physical and mechanical properties of dried sediment from a lake in Wuhan, China, were analyzed. Orthogonal tests, compressive strength measurements, and X-ray diffraction spectrum and scanning electron microscope analyses were used to investigate the solidification effects of three types of alkaline materials used alone or in combination with the lake sediment: straw ash, calcium lime, and sodium silicate. In the single-doped samples, calcium lime had the best curing effect, with a maximum seven-day compressive strength of 1.31 MPa (190 psi). When the compound-doped samples were cured to seven days, the maximum compressive strength was 7.18 MPa (1040 psi). Furthermore, with the compound-doped materials, sediment solidification was aided by suitably alkaline conditions and large quantities of active sili¬con-calcium components. As a result, the microstruc¬tures of the cured compound-doped samples were more compact and their overall mechanical properties were greatly improved.

Structurae cannot make the full text of this publication available at this time. The full text can be accessed through the publisher via the DOI: 10.15554/pcij68.5-03.
  • About this
    data sheet
  • Reference-ID
    10733998
  • Published on:
    03/09/2023
  • Last updated on:
    03/09/2023
 
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