Agradecimentos: This work has been supported by the following Brazilian research agencies: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) proc. 310375/2020-7 and proc. 309102/2023-5; and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) proc. 2023/05479-4. The authors also thank the Postgraduate Program in Technology of University of Campinas (UNICAMP) Ver menos

Abstract: Cement composites with electrical properties are very important, especially for applications in Structural Health Monitoring (SHM) through self-sensing. In some cases, noble materials such as graphene, carbon nanotubes, and nanographite are used in the production of these cement composites, which represents a high production cost. In this context, combining circular economy concepts, and highlighting the concentration of existing electrically conductive materials, an experimental self-sensing cement composite (SSCCs) was developed using brake lining waste as the main novelty of this research. The choice of this waste was due to the possible existence of graphite and metallic particles in it, which can contribute to improving the piezoresistive properties of SSCC and increasing its use in civil construction. From the 1:2 ratio (cement:sand), sand was gradually replaced by waste in proportions of 20, 40, 60, 80, and 100 %, seeking to guarantee both self-sensing performance due to the quantity of conductive materials as well as the quality of their dispersion in the mixture. In the analysis of compressive and flexural strength properties, it was found that in replacements of up to 40 % there was no statistically significant reduction in strength. The electrical conductivity of the SSCC increased significantly from the replacements by 40 %. In the piezoresistive analysis, an improvement in electrical sensitivity to voltage was observed, as well as a correlation between electrical and mechanical changes, through a gradual increase in the replacement of sand by waste. Thus, the developed SSCC presented promising results, both in mechanical and piezoresistive properties, which allows us to conclude that its production, even on a laboratory scale deserves further research aiming at future applications Ver menos