INTECIN   20395
INSTITUTO DE TECNOLOGIAS Y CIENCIAS DE LA INGENIERIA "HILARIO FERNANDEZ LONG"
Unidad Ejecutora - UE
artículos
Título:
Acoustic emission monitoring of high-strength concrete beams with and without fibers exposed to high temperature Monitoreo mediante emisión acústica de vigas de hormigón de alta resistencia con y sin fibras expuesto a alta temperature
Autor/es:
NUÑEZ, NICOLÁS; FOLINO, PAULA; GÓMEZ, MARTÍN; XARGAY, HERNÁN
Revista:
REVISTA MATéRIA
Editorial:
UNIV FED RIO DE JANEIRO
Referencias:
Año: 2018 vol. 23
ISSN:
1517-7076
Resumen:
The addition of fibers to the cementitious matrix, giving rise to fiber-reinforced concrete, aims to improve the low ductility observed in concrete mechanical response under different load scenarios, particularly under direct tension. In this work, cracking and mechanical degradation processes of concrete elements using acoustic emission technique are examined, with the objective of analyzing the incidence of high temperatures on the failure behavior of high-strength concrete beams with and without fibers. Results of an experimental campaign including different mechanical tests on concrete specimens with and without the addition of a hy-brid combination of steel and polypropylene fibers are presented. The incorporation of polypropylene fibers is intended to improve the behavior of concrete against elevated temperatures. The evolution of acoustic emission measurements during bending tests and its relation with the mechanical response is analyzed. It is observed that after being exposed to a temperature of 600°C, properties of fiber reinforced concrete were relatively less affected than those of plain concrete, retaining some capacity to absorb energy in the post-peak regime. It is also confirmed that the monitoring technique used, has a direct correlation with the degradation process of concrete.