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The construction sector is among the most polluting industries worldwide and seeks to achieve decarbonization through the use of sustainable materials. In this context, innovative construction materials such as bio-concrete—developed with biologically sourced aggregates—are being explored. This study aims to develop and evaluate the fresh-state properties (slump test and incorporated air content) and hardened-state properties (capillary water absorption and compressive strength) of bamboo bio-concretes produced with fine (FB) and coarse (CB) bio-aggregates. A total volumetric fraction of 30% was used, along with a cementitious matrix comprising Portland cement, metakaolin, and fly ash, with a water-to-binder ratio of 0.30. The results demonstrated that bio-concretes with higher coarse bio-aggregate content exhibited up to 44.62% lower capillary water absorption and achieved modulus of elasticity values up to 39.75% higher compared to mixtures containing only FB. Additionally, direct water exposure was found to negatively impact the mechanical performance of the material, leading to reduced strength and Young's modulus. All mixtures were found to be workable and moldable, with the inclusion of CB resulting in less porous mixtures, provided that a minimum proportion of FB is maintained in the composition.

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Particle Size Influence on the Properties of Bamboo Bio-Concrete in Fresh and Hardened States

  • 会议论文

  • 发表日期：

    2025年

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  • Ludmilla Cardoso de Carvalho Gangorra,
  • Vanessa Maria Andreola,
  • Thaís Pinto Lôbo Siqueira,
  • Romildo Dias Toledo Filho

摘要

The construction sector is among the most polluting industries worldwide and seeks to achieve decarbonization through the use of sustainable materials. In this context, innovative construction materials such as bio-concrete—developed with biologically sourced aggregates—are being explored. This study aims to develop and evaluate the fresh-state properties (slump test and incorporated air content) and hardened-state properties (capillary water absorption and compressive strength) of bamboo bio-concretes produced with fine (FB) and coarse (CB) bio-aggregates. A total volumetric fraction of 30% was used, along with a cementitious matrix comprising Portland cement, metakaolin, and fly ash, with a water-to-binder ratio of 0.30. The results demonstrated that bio-concretes with higher coarse bio-aggregate content exhibited up to 44.62% lower capillary water absorption and achieved modulus of elasticity values up to 39.75% higher compared to mixtures containing only FB. Additionally, direct water exposure was found to negatively impact the mechanical performance of the material, leading to reduced strength and Young's modulus. All mixtures were found to be workable and moldable, with the inclusion of CB resulting in less porous mixtures, provided that a minimum proportion of FB is maintained in the composition.