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Effects of water-to-cement ratio and temperature on diffusion of water in hardened cement pastes

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Title: Effects of water-to-cement ratio and temperature on diffusion of water in hardened cement pastes
Authors: Takiya, Hiroaki Browse this author
Watanabe, Naoko Browse this author
Kozaki, Tamotsu Browse this author →KAKEN DB
Sato, Seichi Browse this author →KAKEN DB
Keywords: diffusion
activation energy
radioactive waste management
tritiated water
water-to-cement ratio
hardened cement paste
Issue Date: May-2015
Publisher: Taylor & Francis Ltd
Journal Title: Journal of nuclear science and technology
Volume: 52
Issue: 5
Start Page: 728
End Page: 738
Publisher DOI: 10.1080/00223131.2014.979902
Abstract: Apparent diffusion coefficients (D-a) of water and activation energies (E-a) of diffusion in hardened cement pastes (HCPs) were determined as a function of water-to-cement (w/c) ratio (0.36-0.60) and temperature (293-323K) using HTO and (H2O)-O-18 as tracers. The values of D-a and E-a ranged from 1.1x10(-11) to 1.7x10(-10) m(2) s(-1) and from 21.5 to 31.3 kJ mol(-1), respectively. No significant difference between the D-a values of HTO and (H2O)-O-18 suggests that water predominantly diffuses as H2O molecule and dissociation of water is not significant even at high pH range in HCP. The values of E-a at low w/c ratio were higher than in bulk liquid water, suggesting a contribution of a different water regime, such as supercooled bulk water. Two simple models consisting of capillary and gel pores were considered to estimate the volume ratio of gel pores to total pores by optimizing the model to fit with the experimental data. The result suggests that HCP has a pore network mostly consisting of capillary pores with some very narrow pores plugged with hydrates, where HTO must diffuse through gel pores. This view of the HCP pore network was made available through analysis of E-a values.
Rights: This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of nuclear science and technology on May 2015, available online:
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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