Residual mechanical properties and durability of high-strength concrete with polypropylene fibers in high temperatures
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Universidade Federal de Minas Gerais
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Artigo de periódico
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Membros da banca
Resumo
Investigations into the fire resistance of high-strength concrete (HSC) is extremely important to optimize structural design in construction engineering. This work describes the influence of polypropylene fibers on the mechanical properties and durability of HSC at high temperatures (25, 100, 200, 400, 600 and 800 ◦C). HSC specimens with 2 kg/m3 composed of polypropylene fibers
are tested in a temperature range of 25 to 800 ◦C, followed by microstructural analysis. In addition, a statistical analysis is designed to identify the effect of factors, namely temperature and polypropylene fibers, and their interactions on mechanical properties and water absorption, electrical resistivity, mass loss and ultrasonic velocity. Most of the properties are improved by the incorporation of
fibers, obtaining highly predictable regression models. However, the polypropylene fibers reduce compressive strength but improve the residual mechanical properties up to 400 ◦C.
Abstract
Assunto
Concreto, Fibras sinteticas, Concreto de alta resistencia
Palavras-chave
Cementitious materials, Synthetic fibers, High temperatures, Residual properties, Regression models
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https://www.mdpi.com/1996-1944/15/13/4711