Desenvolvimento e caracterização de pastas cimentícias com cinza da folha de bambu e pó de granito

Abstract

The cement industry faces great challenges with regard to cleaner production, needing to continuously modernize to meet the energy demands proposed worldwide. In this sense, one of the alternatives to corroborate sustainable demands is the use of supplementary cementitious materials (SCM). The objective of this work is to develop cementitious pastes with bamboo leaf ash (BLA) and granite powder (GP). For this purpose, ternaries of cement pastes were elaborated, using BLA and GP in identical proportions, namely 2.5%, 5%, 10%, 15% and 20%. The materials were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD) and thermogravimetry (TG/DTG) techniques, while the cementitious pastes were evaluated for chemical composition, thermal stability and pozzolanic activity index. Through the characterization, it was verified that BLA and GP are amorphous and crystalline materials, respectively, silicoaluminous and present good thermal stability. For cementitious pastes, the samples with 2.5% and 5% of the materials reached 75% compressive strength of the sample in relation to the control group, and these were the proportions indicated as optimal for cement replacement.