Caracteriazação numérico - experomental do comportamento dielétrico de compóstos cimentícios à base de nanotubos de carbono

Abstract

Carbon Nanotubes (CNT) have helped in the development of smart materials, especially for structural health monitoring (SHM) applications. The interaction between nanotubes and cement composites has advanced the study of concretes with notable electrical properties. However, research into the properties of cement-based composites containing Carbon Nanotubes (CNTCS) is challenging due to the high costs of CNTs, making it difficult to produce a significant number of samples for experimental testing or implementation in full-scale structures. In this context, numerical modeling emerges as an effective tool for optimizing research, saving time and resources. This work proposes the application of a numerical model based on the Finite Element Method (FEM) to simulate and analyze the electrical behavior of the CNTCS. The model was calibrated and validated in past studies through analytical and experimental analyzes of the literature. Numerical simulations of electrical tests were conducted on CNTCS specimens with 14-day samples with contents of 0%, 1%, 1.5% and 2% of CNTS in cement weight, varying the distances between the electrodes (4 cm, 8 cm and 12 cm). The results highlight the significant influence of the distance between electrodes on the electrical behavior of the CNTCS. The efficiency and accuracy of the numerical model have been proven, establishing it as an exceptional tool to guide the development of SHM sensors, offering valuable insights to optimize the practical application of these materials in structural monitoring.