Self-sensing cement composite based on the piezoresistive effect with brake lining waste

Autor(es)

Silva, Joao Batista Lamari Palma e ; Silva, Camila Tiemi Ozaki e ; Marcula, Stephanie Cucolo ; Ros, Pedro Serna ; Lintz, Rosa Cristina Cecche ; Gachet, Luisa Andreia

• Tipo de documento: Artigo Científico
• Fonte: CONSTRUCTION AND BUILDING MATERIALS; v. 456, p. 14-pg., 2024-12-20.

Resumo

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. (AU)

• Processo FAPESP: 23/05479-4 - Produção e avaliação de compósito cimentício autossensível (CCA) baseado no efeito piezoresistivo, produzido com resíduo de lonas de freios de veículos pesados, concomitantemente com fibras e nanotubos de carbono
• Beneficiário: Luísa Andréia Gachet
• Modalidade de apoio: Auxílio à Pesquisa - Regular