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Deleterious Substances in Aggregate01:25

Deleterious Substances in Aggregate

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Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
Another type of impurity is clay and fine material that...
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Mitigating Composition Variability in Post-Industrial PC/ABS Recycling via Targeted Compatibilization.

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This study enhances the impact strength of recycled automotive plastics, like polycarbonate (PC) and acrylonitrile-butadiene-styrene (ABS), using an ethylene-methyl acrylate-glycidyl methacrylate (E-MA-GMA) terpolymer. This offers a sustainable solution for high-performance applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Engineering

Background:

  • Growing demand for sustainable plastics necessitates effective recycling of post-industrial polymer waste.
  • Automotive scraps containing polycarbonate (PC), acrylonitrile-butadiene-styrene (ABS), and PC/ABS blends present recycling challenges.
  • Improving the mechanical properties of recycled polymer blends is crucial for high-performance applications.

Purpose of the Study:

  • To investigate the mechanical recycling of automotive polymer waste (PC, ABS, PC/ABS).
  • To identify effective compatibilizers and impact modifiers to enhance recycled blend properties.
  • To develop a predictive model for impact performance based on blend composition and additive content.

Main Methods:

  • Compositional analysis of representative automotive scrap batches.
  • Screening of seven commercial compatibilizers and impact modifiers.
  • Mixture design approach varying polymer phase composition and additive content (0-10 wt.%).
  • Rheological, mechanical, and thermal analyses to characterize recycled blends.

Main Results:

  • An ethylene-methyl acrylate-glycidyl methacrylate (E-MA-GMA) terpolymer was identified as the most effective additive for improving impact strength.
  • A significant increase in impact resistance was observed in PC-rich formulations with increasing E-MA-GMA content.
  • A response surface model was developed to predict impact performance across various compositions, indicating improved matrix compatibility and reduced processing degradation.

Conclusions:

  • Targeted compatibilization with E-MA-GMA terpolymer significantly enhances the impact strength of recycled PC-rich automotive blends.
  • The developed predictive model provides a practical tool for optimizing recycled blend compositions for specific performance requirements.
  • These findings support the feasibility of closed-loop recycling strategies in the automotive sector through effective compatibilization.