Abstract
This study aimed to detect damage based on thermal and electrical resistance properties by fabricating composites in which multi-walled carbon nanotubes (MWCNTs) and cement-based materials are mixed. The experimental parameters used were the cement-based material type, MWCNT concentration, curing period, and presence of damage. The experimental results showed that damage in cement paste can be detected using the heat property at every MWCNT concentration, and damage in mortar can be detected at MWCNT concentrations of ≤0.25 wt%. However, damage to concrete is difficult to detect using the heat property. Damage to cement paste, mortar, and concrete can be detected at every concentration using the electrical resistance property. Furthermore, field emission scanning electron microscopy (FE-SEM) results revealed uniformly dispersed MWCNTs inside the composites without agglomeration or the formation of carbon nanotube (CNT) networks.
Highlights
Concrete structures are aging quickly owing to abnormal climate caused by global warming and other external factors, which reduce the strength of such structures and result in damage
The results showed that the mixing of single-walled carbon nanotubes (SWCNTs) produced better heating properties than those obtained when multi-walled carbon nanotubes (MWCNTs) were mixed at the same concentration
The temperature differences owing to the occurrence of damage to the mortar and concrete with 0.125 wt% MWCNT were less than 3 ◦C and, insignificant
Summary
Concrete structures are aging quickly owing to abnormal climate caused by global warming and other external factors, which reduce the strength of such structures and result in damage. The concrete damage detection method currently used poses a risk of different interpretations of the evaluation results depending on the concrete material, structure, external environment, and craftsmanship of the workers. To address this problem, a new concrete damage detection method based on the mixing of nanomaterials is investigated in this study. The introduction of nanotechnology is expected to convert cement-based materials into new construction materials with various advantages such as mechanical, electrical, and thermal functions. The mixture of existing cement-based materials and CNTs has been extensively researched both domestically and internationally in the development of new construction composite materials with diverse performances [8,9,10,11,12,13,14]
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