Porous Structure of ultra-high-performance fibre-reinforced concretes
The aim of this experimental work was to study the porous structure of Ultra-High- Performance Fibre-Reinforced Concretes (UH) made with different fibre volume contents (0%, 1%, 2%) under several curing conditions (laboratory environment, 20 °C, 60 °C, 90 °C), comparing the results with those rec...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Consejo General de la Arquitectura Técnica de España (CGATE) |
| Repositorio: | RIARTE |
| OAI Identifier: | oai:www.riarte.es:20.500.12251/2634 |
| Acceso en línea: | http://hdl.handle.net/20.500.12251/2634 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85103394817&doi=10.3390%2fma14071637&partnerID=40&md5=54d54d530ba8b26be953a642e43eaea7 |
| Access Level: | acceso abierto |
| Palabra clave: | Hormigón estructural (HE) Fibra de refuerzo Material compuesto Hormigón de Alta Resistencia Porosidad Ensayos (propiedades o materiales) Resistencia mecánica Material de construcción 3305.05 Tecnología del Hormigón 2211.02 Materiales Compuestos 3305.33 Resistencia de Estructuras 3313.04 Material de Construcción 3312.09 Resistencia de Materiales 3312.08 Propiedades de Los Materiales 3312.12 Ensayo de Materiales |
| Sumario: | The aim of this experimental work was to study the porous structure of Ultra-High- Performance Fibre-Reinforced Concretes (UH) made with different fibre volume contents (0%, 1%, 2%) under several curing conditions (laboratory environment, 20 °C, 60 °C, 90 °C), comparing the results with those recorded for ordinary, high strength and very high strength concretes. Scanning electron microscopy, mercury intrusion porosimetry, thermogravimetry, water absorption and oxygen permeability tests were carried out. The results showed a low portlandite content in UH (in the order of 75% lower than in concrete C50) and a low degree of hydration, but they rise with curing temperature. These concretes have a very fine porous structure, with a high concentration of pores on the nanoscale level, below 0.05 µm. Their porosity accessible to water is consequently around 7-fold lower than in conventional (C30), 6-fold lower than in high-strength (C50) and 4- fold lower than in very high-strength (C90) concretes. Their oxygen permeability is at least one order of magnitude lower than in C90, two orders of magnitude lower than in C50 and three orders of magnitude lower than in C30. The percentage of added steel fibre does not affect the UH porous structure. © 2021 by the authors. |
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