Journal
CEMENT & CONCRETE COMPOSITES
Volume 121, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2021.104104
Keywords
High temperatures; Structural health monitoring; Smart cement-based composites; Carbon black nanoparticles; Carbon nanotubes; Piezoresistivity
Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) [001]
- Civil Engineering Department of the Federal University of Vicosa
- Physics Department of the Federal University of Vicosa
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This study investigated the feasibility of using smart cement-based composites containing MWCNT or CBN for Structural Health Monitoring of fire-damaged concrete structures. The results showed that the sensing ability of the composites was enhanced after exposure to 200 degrees C, with composites containing 0.8% or 1.2% MWCNT maintaining self-sensing ability up to 400 degrees C. Composites with 6% or 9% CBN exhibited residual self-sensing ability after exposure to temperatures up to 600 degrees C, with 9% CBN composites showing the interesting ability of self-detection of fire damage.
This study investigated the viability of using smart cement-based composites containing multi-walled carbon nanotubes (MWCNT) or carbon-black nanoparticles (CBN) for Structural Health Monitoring of fire-damaged concrete structures. A total of 112 composites were produced with different nanofiller concentrations, exposed to distinct heat treatments, and subjected to electro-mechanical tests. The results elucidated the influence of temperature on their residual capacitance, conductivity, and piezoresistivity. The thermal decomposition of nanofillers was investigated through thermogravimetric analysis and Raman spectroscopy. The sensing ability of smart composites was improved after exposure to 200 degrees C. Composites with 0.8% or 1.2% of MWCNT exhibited adequate residual self-sensing ability after exposure to temperatures up to 400 degrees C. Mortars containing 6% or 9% of CBN exhibited residual self-sensing ability after temperatures up to 600 degrees C. Composites with 9% of CBN also exhibited an interesting ability of self-detection of damage due to fire.
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