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This paper analyzes the impact of four types of biobased aggregates (hemp, bamboo, reed and rapeseed) and their orientation (parallel or perpendicular to the compaction direction) on the mechanical properties of biobased concrete. Digital image correlation (DIC) was used to study mechanical deformation at two scales: that of the composite material and that of the interfacial transition zone (ITZ) around the aggregates. The results show that biobased concrete oriented parallel to compaction are stiffer, but more susceptible to damage at low strain rates as low as 2%. Hemp concrete, the strongest concrete, undergoes limited vertical displacement but shows more pronounced damage. Bamboo concrete, on the other hand, although denser, has the lowest mechanical performance. Finer aggregates, such as reed, offer better mechanical properties thanks to better adhesion and compatibility with the mineral matrix. Finally, local DIC analysis reveals zones of concentrated deformation for parallel-oriented aggregates, resulting in weaker affinity and buckling failure in this configuration. It is therefore recommended to orient the aggregates perpendicular to the compaction direction for better load distribution and optimal energy dissipation

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Multi-scale Analysis on the Effect of Aggregate Type and Orientation on the Mechanical Properties of Biobased Concrete

  • 会议论文

  • 发表日期：

    2025年

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  • Rafik Bardouh,
  • Evelyne Toussaint,
  • Sofiane Amziane,
  • Sandrine Marceau

摘要

This paper analyzes the impact of four types of biobased aggregates (hemp, bamboo, reed and rapeseed) and their orientation (parallel or perpendicular to the compaction direction) on the mechanical properties of biobased concrete. Digital image correlation (DIC) was used to study mechanical deformation at two scales: that of the composite material and that of the interfacial transition zone (ITZ) around the aggregates. The results show that biobased concrete oriented parallel to compaction are stiffer, but more susceptible to damage at low strain rates as low as 2%. Hemp concrete, the strongest concrete, undergoes limited vertical displacement but shows more pronounced damage. Bamboo concrete, on the other hand, although denser, has the lowest mechanical performance. Finer aggregates, such as reed, offer better mechanical properties thanks to better adhesion and compatibility with the mineral matrix. Finally, local DIC analysis reveals zones of concentrated deformation for parallel-oriented aggregates, resulting in weaker affinity and buckling failure in this configuration. It is therefore recommended to orient the aggregates perpendicular to the compaction direction for better load distribution and optimal energy dissipation