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Article

Porous Structure of Ultra-High-Performance Fibre-Reinforced Concretes

1
Department of Architectural Constructions, School of Architecture, Universitat Politècnica de València, Camino de Vera, s/n., 46022 Valencia, Spain
2
Research Institute for Molecular Recognition and Technological Development (IDM), Universitat Politècnica de València, Camino de Vera, s/n., 46022 Valencia, Spain
3
Concrete Science and Technology University Institute (ICITECH), Universitat Politècnica de València, Camino de vera s/n, 46022 Valencia, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Angelo Marcello Tarantino
Materials 2021, 14(7), 1637; https://doi.org/10.3390/ma14071637
Received: 7 March 2021 / Revised: 20 March 2021 / Accepted: 22 March 2021 / Published: 26 March 2021
(This article belongs to the Section Construction and Building Materials)
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. View Full-Text
Keywords: ultra-high-performance fibre-reinforced concrete; porosity; water porosity; oxygen permeability ultra-high-performance fibre-reinforced concrete; porosity; water porosity; oxygen permeability
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MDPI and ACS Style

Valcuende, M.; Lliso-Ferrando, J.R.; Roig-Flores, M.; Gandía-Romero, J.M. Porous Structure of Ultra-High-Performance Fibre-Reinforced Concretes. Materials 2021, 14, 1637. https://doi.org/10.3390/ma14071637

AMA Style

Valcuende M, Lliso-Ferrando JR, Roig-Flores M, Gandía-Romero JM. Porous Structure of Ultra-High-Performance Fibre-Reinforced Concretes. Materials. 2021; 14(7):1637. https://doi.org/10.3390/ma14071637

Chicago/Turabian Style

Valcuende, Manuel, Josep R. Lliso-Ferrando, Marta Roig-Flores, and José M. Gandía-Romero. 2021. "Porous Structure of Ultra-High-Performance Fibre-Reinforced Concretes" Materials 14, no. 7: 1637. https://doi.org/10.3390/ma14071637

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