Expanded Clay Aggregate, ECA, Leca, Reducing Railway Noise,

Reducing Railway Noise

  • Due to accelerated urbanization, industrialization and economic growth in the developed countries, rail transportation especially high-speed railways such as bullet trains have undergone a rebirth in development level and scale across these countries
  • There are several methods to mitigate this but some of these methods are highly expensive to build and maintain.
  • This brings about the introduction of porous concrete slab using Expanded Clay Aggregate (ECA®) in the construction of rail lines.
  • The acoustical/sound absorption properties of porous concrete materials with various gradations, aggregate types, compaction indexes, and fiber contents are determined in the laboratory.
  • The results show that porous concrete that uses an Expanded Clay Aggregate (ECA®) can not only bring about good acoustical absorption property but also satisfies the mechanical requirements.
  • The gradation of the Expanded Clay Aggregate (ECA®) has a great effect on the acoustic/sound absorption performance of the porous concrete, with high aggregate gradation of 2 - 3 mm.
  • The compaction index and fiber content affect both the acoustic/sound absorption and strength property of the porous concrete, with value of 0.4% and 1.8% respectively.
  • Porous sound-absorbing concrete slabs can immensely reduce railway noise at different train speeds and that the amount of the noise reduction changes with speed.

Benefits of using Expanded Clay Aggregate (ECA®) in the construction of Railways:


  • It improves stability of surrounding area and structures
  • It simplifies and reduces compaction
  • It reduces load on the supporting soil subgrade
  • It reduces the horizontal thrust on the supporting structures
  • It reduces settlement
  • It provides excellent insulation
  • It acts as an excellent drainage material
  • It helps reducing railway noise with porous sound-absorbing concrete slab



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