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Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
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Study on dynamic characteristics of salinized silt under cyclic loading.

Biao Wu1, Jing Yuan Kou1, Ming Min Xuan2

  • 1China Airport Construction Group Corporation, Beijing, China.

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Summary

Salinized silt subgrades are susceptible to plastic deformation under aircraft loads. This study reveals salt content significantly impacts silt strength, with optimal performance at 1% salt concentration, decreasing at higher levels.

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Area of Science:

  • Geotechnical Engineering
  • Civil Engineering
  • Materials Science

Background:

  • Subgrade plastic deformation is critical for airfield performance with salinized silt.
  • Aircraft taxiing loads induce significant stress on airfield subgrades.

Purpose of the Study:

  • To investigate the dynamic characteristics of salinized silt under cyclic loading.
  • To determine the influence of varying salt content on silt's dynamic strength and plastic deformation.
  • To develop a prediction model for salinized silt dynamic strength.

Main Methods:

  • Dynamic triaxial tests were performed on salinized silt samples.
  • Cyclic loading was applied to simulate aircraft taxiing conditions.
  • Salt content variations were systematically analyzed.

Main Results:

  • Increased dynamic stress amplitude led to a transition from plastic deformation to incremental failure.
  • Salt content significantly affected plastic strain and critical dynamic stress.
  • Optimal strength observed at 1% salt content, with strength decreasing at higher concentrations.

Conclusions:

  • A prediction model for salinized silt dynamic strength was developed using a 4% plastic strain failure criterion.
  • Soil particle arrangement and pore ion concentration are key factors influencing salinized silt strength.
  • Findings are crucial for designing stable airfields in regions with salinized soils.