The present study aims to accent the effect of nano-reinforcements such as CNTs and graphene nanoplatelets, on the electrical and thermal behavior of nano-modified concrete. The dispersion agent used is a water-based superplasticizer since this type of agent does not induce air in the specimens and is also chemically compatible. The assessment of the specimens includes evaluation of different physical properties, such as electrical resistivity and thermal behavior. The enhancement of these physical properties by the nano-reinforcement phase, induces multifunctionalities in the concrete specimens. Such innovative nano-reinforced concrete mixtures would enable the use of concrete in new areas like energy harvesting, real time health monitoring and self-sensing of critical structural elements.
Since wear and corrosion of materials currently causes large losses of GDP, surface engineering is a critical technology that currently supports the competitiveness of industry globally. Major sectors such as energy, aerospace, automotive and tool industries, are heavily dependent on surface treatments. It is estimated that almost 80% of all these industrial applications depend on protective coatings. Although different coatings have been developed in recent years, two types dominate the field of protective coatings, Hard Chrome and Cermet WC-Co coatings. Both types of coatings have very good mechanical and tribological properties, however, the extremely negative environmental impact of the hard chrome process related to the use of carcinogenic hexavalent chromium has led to a series of directives and legislation in several countries on limiting this method. Additionally, recent studies have shown that WC-Co particles are toxic in a dose and time-dependent manner. This was the driver for developing an innovative technology based on the incorporation of nanoparticles into the electrolytic deposition or thermal spray production line to create green protective nano-reinforced multifunctional coatings. The innovative green solution presented here is accompanied by significant benefits beyond their excellent performance. In particular, the new processes can be easily adopted combining flexibility with mass production, being environmentally friendly and nonharmful to health, combining low implementation costs with green footprint both in terms of materials and processes. Moreover, the novel coatings are being characterized with different destructive and nondestructive techniques and their performance is being compared with traditional coatings.
KEYWORDS: 3D modeling, Thermography, Thermal modeling, 3D scanning, Nondestructive evaluation, Cultural heritage, Scanners, Data modeling, Data fusion, 3D image processing
The authentication and sustainability of cultural heritage monuments are of great importance due to their uniqueness. Recent accidents and natural disasters have taught us that all monuments, even the most protected such as the cathedral Notre-Dame de Paris, can be destroyed by an unexpected event. For these reasons, it is of paramount importance the creation of a monument database containing fusion data not only of the accurate 3D model and precise representation of the artifacts/monuments but also about the condition and procedures of restoration and preservation and the structural health of the antiquities by means of quantitative non-destructive techniques, such as Infrared Thermography. The 3D model of a monument would guarantee the accurate restoration of the monument in case of a catastrophic disaster, while the 3D model of an artifact together with the entire related metadata would provide a digital identity, therefore guaranteeing the sustainability of the item. Also, in case of a movable artifact, it will be a useful tool towards the validation / authentication of the artifact in case it is damaged or missing.
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