Advanced Coatings of Polyureas for Building Blast Protection: Physical, Chemical, Thermal and Mechanical Characterization

Due to the increase in the global terrorist threat, there has been a growing demand for materials that can more efficiently protect civil, industrial, and military structures against explosions. In this sense, two new commercial polyureas (A and B), that present high potential to be used as a protec...

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Bibliographic Details
Published in:Applied sciences 2022-11, Vol.12 (21), p.10879
Main Authors: Leite, Fernando, Mota, Carlos, Bessa, João, Cunha, Fernando, Fangueiro, Raul, Gomes, Gabriel, Mingote, José
Format: Article
Language:English
Subjects:
blast protection
Blasts
Bombings
coating
Coatings
Concrete
Construction
Ductility
Elongation
Explosions
Load
Masonry
Mechanical properties
Mechanical tests
Military engineering
Polymers
polyurea
Polyureas
Protective coatings
Reinforced concrete
Scanning electron microscopy
Shock wave attenuation
Tensile properties
Tensile strength
Terrorism
Viscosity
Wave attenuation
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Summary:Due to the increase in the global terrorist threat, there has been a growing demand for materials that can more efficiently protect civil, industrial, and military structures against explosions. In this sense, two new commercial polyureas (A and B), that present high potential to be used as a protective coating on building facades against explosions, were compared in this work, through several tests. Chemical characterization with the Scanning Electron Microscope (SEM) of the surface of the polyureas revealed that the commercial polyurea A has a heterogeneous surface while the other polyurea has a more uniform and homogeneous surface, resulting in a more compact structure. The shock-wave attenuation ability of polyurea is believed to be controlled primarily by the hard domains. The TGA tests revealed that polyurea B has more hard segments than polyurea A in its composition. The mechanical tests performed showed that polyurea B has significantly better tensile properties-almost 3000% of maximum deformation capacity compared with approximately 115% of polyurea A. Thus, it was concluded that polyurea B has more potential to be used as a coating in building blast protection due to its exceptional elongation characteristics, a critical parameter to absorb the high frequency and intensity of blasts.
ISSN:2076-3417
2076-3417
DOI:10.3390/app122110879