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Related Concept Videos

Permeability of Concrete01:25

Permeability of Concrete

459
Permeability in the context of concrete refers to how easily liquids or gases can pass through the material. This quality is crucial for assessing the water-tightness and durability of concrete structures and their resistance to chemical attacks. Concrete permeability can be determined through comparative laboratory tests. These tests typically involve sealing a concrete specimen from the sides, applying water pressure to the top surface with pressure, and measuring the amount of water passing...
459

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Experimental study on soil impermeability based on chemical improvement method.

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Coastal foundation pits face seepage failure due to high soil permeability. This study found sodium polyacrylate significantly reduces erosion and stabilizes permeability, offering effective anti-seepage solutions for challenging geological conditions.

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Area of Science:

  • Geotechnical Engineering
  • Soil Science
  • Chemical Stabilization

Background:

  • Coastal silty sand foundation pits exhibit high permeability, increasing susceptibility to seepage failure.
  • Effective anti-seepage measures are crucial for the stability of these structures.

Purpose of the Study:

  • To evaluate the efficacy of three chemical stabilizers (sodium silicate, calcium lignosulfonate, sodium polyacrylate) in mitigating permeability in coastal silty sand.
  • To identify the most effective stabilizer for improving anti-seepage properties.

Main Methods:

  • Utilized a self-designed seepage test system to assess permeability characteristics.
  • Compared the performance of untreated silty sand with soil treated by three different chemical stabilizers.
  • Analyzed cumulative erosion mass, erosion rate, and permeability coefficient stabilization.

Main Results:

  • Untreated soil showed exponential increase in erosion mass (89.39 g/min rate).
  • All stabilizers reduced erosion rates below 30 g/min.
  • Sodium polyacrylate (4% dosage, 6h cure) achieved superior results: 3.98 g/min erosion rate, 35g cumulative mass, permeability 10⁻⁶-10⁻⁷ cm/s, and 6.3 min stabilization time.

Conclusions:

  • Sodium polyacrylate demonstrates superior performance in reducing permeability and erosion compared to sodium silicate and calcium lignosulfonate.
  • The findings provide effective chemical improvement solutions for anti-seepage engineering in coastal foundation pits.
  • Sodium polyacrylate meets anti-seepage requirements for high-standard cut-off walls.