Characterization of moisture transfer in UHPFRC - concrete composite systems at early age

Author(s): H. Kazemi-kamyab, E. Denarié, E. Brühwiler, Biyun Wang, M. Thiéry, P.F. Faure, V. Baroghel-Bouny
Paper category: Conference
Book title: 2nd International conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. Van Breugel, Wei Sun, Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 1540- 1548
Total Pages: 8
Language: English

Abstract: 
Better understanding of the hydration process and hydration kinetics in advanced cementitious materials such as UHPFRC is required. Furthermore UHPFRC used for rehabilitation not only would be subjected to the climatological conditions (temperature and humidity) of the site but also the microclimatic state of the substrate (moisture and thermal conditions).

This paper presents information related to (1) the development of the free water consumption in plain UHPFRC from the time of casting up to 48 hours, (2) The water transfer processes between the UHPFRC and a dry concrete substrate from the time of placing up to 48 hours. Both objectives were achieved by utilizing the nondestructive Nuclear Magnetic Resonance (NMR) setup at Laboratory Navier.

For the first objective, Proton NMR (1-NMR) relaxometry was performed on sealed plain UHPFRC samples using two different sequences. By Inversion Recovery (IR) sequence and treatment of data using inverse Laplace transformation, water mobility in UHPFRC was investigated. Free Induction Decay (FID) pulse-acquisition sequence was used to investigate the rate and development of the free water consumption from the time of casting which represents the hydration kinetics. With regard to the second objective, Magnetic Resonance Imaging (MRI- 1D) with Single Point Imaging (SPI) was used to visualize profiles of water transfer exchanges between the UHPFRC and a dry concrete substrate.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00