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

Javier Villar-Hernández, Ernesto Villar-Cociña (), Holmer Savastano and Moisés Frías Rojas
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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

Resources, 2024, vol. 13, issue 7, 1-20

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.

Keywords: binary waste; pozzolanic activity; modeling; kinetic parameters; future low-carbon cements (search for similar items in EconPapers)
JEL-codes: Q1 Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2024
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