Per: RITA DE KASSIA GONCALVES PEREIRA (UNIVERSIDADE ESTADUAL DO NORTE FLUMINENSE DARCY RIBEIRO - UENF), Samuel Araújo Azevedo Malafaia (UNIVERSIDADE ESTADUAL DO NORTE FLUMINENSE DARCY RIBEIRO - UENF), Iully da Silva Amaral Pereira (UNIVERSIDADE ESTADUAL DO NORTE FLUMINENSE DARCY RIBEIRO - UENF), Juliana Fadini Natalli (UNIVERSIDADE ESTADUAL DO NORTE FLUMINENSE DARCY RIBEIRO - UENF), Afonso Rangel Garcez de Azevedo (UNIVERSIDADE ESTADUAL DO NORTE FLUMINENSE DARCY RIBEIRO - UENF), Markssuel Teixeira Marvila (UNIVERSIDADE ESTADUAL DO NORTE FLUMINENSE DARCY RIBEIRO - UENF), Sérgio Neves Monteiro (UNIVERSIDADE ESTADUAL DO NORTE FLUMINENSE DARCY RIBEIRO - UENF)
Abstract:
Concerns about CO2 emissions in the construction industry have driven the search for
sustainable alternatives, such as partially replacing Portland cement with biochar.
Pyrolysis, a thermochemical process of decomposing organic matter in the absence
or near absence of oxygen, is crucial for producing biochar. Besides converting
biomass waste into biochar, pyrolysis sequesters carbon, helping mitigate climate
change. This study investigated the differences in adding biochar, produced at 500°C
and 300°C, to fresh rendering mortars. Concentrations of 0.5% and 1% biochar were
used to replace Portland cement in mortars with a 1:1:6 ratio (cement, lime, and sand).
Laboratory tests evaluated properties such as consistency index, bulk density,
incorporated air content, and water retention. The results showed that the pyrolysis
temperature of biochar distinctly influenced the mortar properties. Biochar produced
at lower temperatures resulted in less porosity, reducing water absorption and
* Contribuição técnica ao 77º Congresso Anual da ABM – Internacional, parte integrante
da ABM Week 8ª edição, realizada de 03 a 05 de setembro de 2024, São Paulo, SP, Brasil.
incorporated air content while increasing water retention. At higher pyrolysis
temperatures, the consistency index decreased, the incorporated air content and bulk
density increased, and water retention decreased.
