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Valorization of Fine-Fraction CDW in Binary Pozzolanic CDW/Bamboo Leaf Ash Mixtures for the Elaboration of New Ternary Low-Carbon Cement

Author

Listed:
  • Javier Villar-Hernández

    (Department of Biosystems Engineering, Faculty of Animal Science and Food Engineering, University of Sao Paulo, Sao Paulo 13635-900, SP, Brazil)

  • Ernesto Villar-Cociña

    (Department of Physics, Central University of Las Villas, Santa Clara 54830, Cuba)

  • Holmer Savastano

    (Department of Biosystems Engineering, Faculty of Animal Science and Food Engineering, University of Sao Paulo, Sao Paulo 13635-900, SP, Brazil)

  • Moisés Frías Rojas

    (Eduardo Torroja Institute (CSIC), c/Serrano Galvache, 4, 28033 Madrid, Spain)

Abstract

This paper presents the characterization of a binary mixture of construction and demolition waste (CDW) and bamboo leaf ash (BLAsh) calcined at 600 °C (novel mixture) and the study of its pozzolanic behavior. Different dosages in a pozzolan/Ca(OH) 2 system were employed. The aim is the valorization of fine-fraction CDW that achieves a more reactive binary mixture and allows an adequate use of CDW as waste, as CDW is a material of limited use due to its low pozzolanic activity. The pozzolanic behavior of the mixture was analyzed using the conductometric method, which measures the electrical conductivity in the CDW + BLAsh/CH solution versus reaction time. With the application of a kinetic–diffusive mathematical model, the kinetic parameters of the pozzolanic reaction were quantified. This allowed a quantitative evaluation of the pozzolanic activity based on the values of these parameters. To validate these results, other experimental techniques were used: X-ray diffraction, thermogravimetry and scanning electron microscopy. Also, mechanical compressive strength assays were carried out. The results show an increase in the pozzolanic activity of binary mixes of CDW + BLAsh for all the dosages used in comparison to the pozzolanic activity of CDW alone. The quantitative assessment (kinetic parameters) shows that the binary mixture CDW50 + BLAsh50 is the most reactive (reaction rate constant of 7.88 × 10 −1 h −1 ) and is superior to the mixtures CDW60 + BLAsh40 and CDW70 + BLAs30. Compressive strength tests show higher strength values for the ternary mixes (OPC + CDW + BLAsh) compared to the binary mixes (OPC + CDW). In view of the results, the binary blend of pozzolans CDW + BLAsh is suitable for the manufacture of future low-carbon ternary cements.

Suggested Citation

  • Javier Villar-Hernández & Ernesto Villar-Cociña & Holmer Savastano & Moisés Frías Rojas, 2024. "Valorization of Fine-Fraction CDW in Binary Pozzolanic CDW/Bamboo Leaf Ash Mixtures for the Elaboration of New Ternary Low-Carbon Cement," Resources, MDPI, vol. 13(7), pages 1-20, July.
    • Handle: RePEc:gam:jresou:v:13:y:2024:i:7:p:100-:d:1438873
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    References listed on IDEAS

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    1. Karellas, S. & Leontaritis, A.-D. & Panousis, G. & Bellos, E. & Kakaras, E., 2013. "Energetic and exergetic analysis of waste heat recovery systems in the cement industry," Energy, Elsevier, vol. 58(C), pages 147-156.
    2. Becker, Nir & Kimhi, Ayal & Argaman, Eli, 2020. "Costs and benefits of waste soils removal," Land Use Policy, Elsevier, vol. 99(C).
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