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<p>The construction industry has a significant impact on the environment, mainly due to high emissions of carbon dioxide (CO<sub>2</sub>), resources consumption, and waste generation. Cement production, as a fundamental component of concrete, accounts for substantial CO₂ emissions. This study aims to compare the concretes’ environmental performance when produced replacing Portland cement with Eucalyptus Chip Ash (ECA), assessing compressive strength (at 28 and 56 days), binder intensity index (BI), and the CO<sub>2</sub> intensity index (CI). Three different ash particle sizes were tested (ECA0.30, ECA0.15, ECA0.075), characterized in terms of: particle size, BET surface area, chemical composition (XRF), phase composition (XRD), microstructure (SEM), and cement Performance Index (PI) at 28 days. The results indicated that the ECAs showed low pozzolanic activity (PI &lt; 90%) and that the ECA0.15 and ECA0.075 ashes can replace 10% of the cement mass without affecting the concrete’s compressive strength and with BI and CI indexes at 56 days, indicating ECA’s potential value.</p>

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Eucalyptus Chip Ash as a Substitute for Portland Cement in Concrete: Binder Content and CO2 Emissions Evaluation

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Kathleen Dall Bello de Souza Risson,
  • Melissa Pastorini Proença,
  • Francieli Stefani Cofani Pinto,
  • Dayana Ruth Bola Oliveira,
  • Edna Possan

摘要

The construction industry has a significant impact on the environment, mainly due to high emissions of carbon dioxide (CO2), resources consumption, and waste generation. Cement production, as a fundamental component of concrete, accounts for substantial CO₂ emissions. This study aims to compare the concretes’ environmental performance when produced replacing Portland cement with Eucalyptus Chip Ash (ECA), assessing compressive strength (at 28 and 56 days), binder intensity index (BI), and the CO2 intensity index (CI). Three different ash particle sizes were tested (ECA0.30, ECA0.15, ECA0.075), characterized in terms of: particle size, BET surface area, chemical composition (XRF), phase composition (XRD), microstructure (SEM), and cement Performance Index (PI) at 28 days. The results indicated that the ECAs showed low pozzolanic activity (PI < 90%) and that the ECA0.15 and ECA0.075 ashes can replace 10% of the cement mass without affecting the concrete’s compressive strength and with BI and CI indexes at 56 days, indicating ECA’s potential value.