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Development of Acoustic Absorbent Materials Using Pine Needles.

Jaime D Ruiz-Martinez1, Begona Peceño2, Carlos J Carrasco1

  • 1Departamento de Ingeniería Química y Ambiental, Escuela Técnica Superior de Ingeniería, Universidad de Sevilla, Camino de los Descubrimientos s/n, 41092 Seville, Spain.

Materials (Basel, Switzerland)
|November 13, 2025
PubMed
Summary
This summary is machine-generated.

Pine needles and resin create sustainable sound-absorbing materials. These eco-friendly materials offer excellent noise reduction, particularly for low-frequency road noise.

Keywords:
cloggingnoise reduction compositepine needle wasteporositysound absorption

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Area of Science:

  • Materials Science
  • Acoustics
  • Environmental Science

Background:

  • Sustainable materials are crucial for noise reduction applications.
  • Waste biomass, like pine needles, offers a potential eco-friendly alternative for acoustic insulation.
  • Traditional acoustic materials often lack sustainability or optimal low-frequency performance.

Purpose of the Study:

  • To investigate the use of waste pine needles (PN) as a primary component in acoustic absorbing materials, utilizing resin as a binder.
  • To characterize the physical, mechanical, and sound-insulating properties of these novel materials.
  • To explore the impact of varying pine needle/resin ratios, fragment lengths, and sample thicknesses on material performance.

Main Methods:

  • Manufacturing of acoustic absorbing material samples using pine needles and resin.
  • Characterization of physical properties (density, porosity).
  • Evaluation of mechanical properties (compressive strength).
  • Measurement of sound absorption coefficient (noise reduction coefficient).

Main Results:

  • Increased pine needle to resin ratio enhances porosity but reduces compressive strength.
  • Achieved noise reduction coefficients of 0.67-0.71 at 4 cm thickness, outperforming typical sound absorption materials.
  • Excess resin can create a reflective layer, suggesting potential for layered acoustic designs.
  • Materials exhibit high sound absorption at low frequencies, suitable for road noise.

Conclusions:

  • Waste pine needles, when combined with resin, form effective and sustainable sound-absorbing materials.
  • The developed materials show significant potential for applications like road noise insulation barriers.
  • Optimizing the pine needle/resin ratio and material structure can yield superior acoustic performance, especially at low frequencies.