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Related Concept Videos

Wood Panel Products01:18

Wood Panel Products

Wood panel products are essential materials used in construction for applications such as flooring, siding, and roofing, typically available in standard dimensions of 4 feet by 8 feet, with thicknesses varying from one-quarter of an inch to one and one-eighth inches. Among the most common types of wood panels is plywood, which is produced by gluing multiple layers of thin wood veneers under pressure. The grain of the outer veneers runs lengthwise, while the grains of the interior layers run...
Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
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Pumped Concrete

Concrete in large quantities can be pumped across long distances for placing in inaccessible sites. This system comprises a hopper that receives concrete from a mixer, a pump to propel the concrete, and pipelines that facilitate its delivery.
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Additives and Fillers in Concrete

Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
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Rigid Polyurethane Biofoams Filled with Pine Seed Shell and Yerba Mate Wastes.

Andrey Pereira Acosta1, Agnė Kairytė2, Sylwia Członka3

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PubMed
Summary
This summary is machine-generated.

Yerba mate waste enhances rigid polyurethane foams (RPUFs) by improving mechanical and thermal properties due to good compatibility. Pine seed shells, however, showed poor compatibility, leading to significant property degradation in RPUFs.

Keywords:
RPUFcharacterizationpine seed shellssustainable foamsyerba mate

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Materials

Background:

  • Agricultural and food industry byproducts like pine seed shells and yerba mate present disposal challenges.
  • Valorization of these waste streams into functional materials is crucial for a circular economy.

Purpose of the Study:

  • To develop rigid polyurethane foams (RPUFs) incorporating pine seed shells and yerba mate as fillers.
  • To investigate the impact of these natural fillers on the chemical, morphological, mechanical, thermal, and colorimetric properties of RPUFs.

Main Methods:

  • Pine seed shells and yerba mate were characterized using bench chemistry analyses.
  • RPUFs were fabricated with 5, 10, and 15 wt% of each filler.
  • Comprehensive characterization of RPUFs including mechanical, thermal, and morphological analyses.

Main Results:

  • Yerba mate exhibited good compatibility with the polyurethane matrix, enhancing mechanical properties and thermal stability (up to ~40%).
  • Pine seed shells showed poor compatibility, resulting in a significant loss of mechanical properties (up to ~50%).
  • Both fillers decreased the glass transition temperature (Tg), with a more pronounced effect from pine seed shells (~-14 °C vs. ~-5 °C).

Conclusions:

  • Yerba mate is a promising sustainable filler for improving RPUF performance.
  • Pine seed shells are not suitable for reinforcing RPUFs due to incompatibility issues.
  • This research highlights the potential of utilizing specific food industry wastes to create value-added materials.