Neutron radiography determination of water diffusivity in fired clay brick

El, A.; Czachor, A.; Milczarek, J.J.

doi:10.1016/j.apradiso.2008.11.014

Cited by 39 publications

(12 citation statements)

References 8 publications

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“…El Abd et al . [] determined the isothermal water diffusivity in fired clay brick using real‐time neutron radiography. Hassanein et al .…”

Section: Introductionmentioning

confidence: 99%

“…More importantly, recent technical improvements in neutron imaging provide adequate spatial and temporal resolution to trace water flow and to obtain quantitative information on moisture content. Researchers have observed temporal changes in the spatial distribution of water in rocks [Dewanckele et al, 2014;Kang et al, 2013], soil [Carminati et al, 2008;Tullis et al, 1994], ceramics [Zhang et al, 2010], sand [Deinert et al, 2004;Vasin et al, 2008], bricks [Czachor et al, 2002;El Abd et al, 2009;Karoglou et al, 2005], and even nanoporous glass [Gruener et al, 2012] using two-dimensional (2-D) neutron radiography and three-dimensional (3-D) tomography. These measurements have been conducted at various centers worldwide-at Oak Ridge National Laboratory in the USA, Paul Scherrer Institute in Switzerland, Helmholtz-Zentrum Berlin in Germany, and the Institute Laue Langevin in France [Hall et al, 2010;Hassanein et al, 2006;Perfect et al, 2014].…”

Section: Introductionmentioning

confidence: 99%

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Effects of microstructure on water imbibition in sandstones using X‐ray computed tomography and neutron radiography

et al. 2017

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Capillary imbibition in variably saturated porous media is important in defining displacement processes and transport in the vadose zone and in low‐permeability barriers and reservoirs. Nonintrusive imaging in real time offers the potential to examine critical impacts of heterogeneity and surface properties on imbibition dynamics. Neutron radiography is applied as a powerful imaging tool to observe temporal changes in the spatial distribution of water in porous materials. We analyze water imbibition in both homogeneous and heterogeneous low‐permeability sandstones. Dynamic observations of the advance of the imbibition front with time are compared with characterizations of microstructure (via high‐resolution X‐ray computed tomography (CT)), pore size distribution (Mercury Intrusion Porosimetry), and permeability of the contrasting samples. We use an automated method to detect the progress of wetting front with time and link this to square‐root‐of‐time progress. These data are used to estimate the effect of microstructure on water sorptivity from a modified Lucas‐Washburn equation. Moreover, a model is established to calculate the maximum capillary diameter by modifying the Hagen‐Poiseuille and Young‐Laplace equations based on fractal theory. Comparing the calculated maximum capillary diameter with the maximum pore diameter (from high‐resolution CT) shows congruence between the two independent methods for the homogeneous silty sandstone but less effectively for the heterogeneous sandstone. Finally, we use these data to link observed response with the physical characteristics of the contrasting media—homogeneous versus heterogeneous—and to demonstrate the sensitivity of sorptivity expressly to tortuosity rather than porosity in low‐permeability sandstones.

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“…El Abd et al . [] determined the isothermal water diffusivity in fired clay brick using real‐time neutron radiography. Hassanein et al .…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of microstructure on water imbibition in sandstones using X‐ray computed tomography and neutron radiography

et al. 2017

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“…Therefore, water is assumed to move through the pores as a consequence of diffusivity due to gradients of water content (Pachepsky et al 2003;Roels et al 2003;Nguyen et al 2008;Johannesson et al 2009;El Abd et al 2009;Hall 1977) and electroosmosis (Cameselle and Reddy 2012;Delgado et al 2007;Lyklema 2005;Paz-Garcia et al 2014;Subires-Munoz et al 2011).…”

Section: Reactive Transport: Theoretical Modelmentioning

confidence: 99%

A Coupled Reactive-Transport Model for Electrokinetic Remediation

Paz‐Garcia

Villén-Guzmán

García-Rubio

et al. 2016

Electrokinetics Across Disciplines and Continents

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“…Radiation attenuation techniques such as X-ray and neutron radiography can be used for visualizing this water uptake in porous materials [20,21,22,23,24,25,26]. Both techniques are efficient to visualize water uptake processes, but X-rays interact differently with matter than neutrons.…”

Section: Introductionmentioning

confidence: 99%

Neutron Radiography Based Visualization and Profiling of Water Uptake in (Un)cracked and Autonomously Healed Cementitious Materials

et al. 2016

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Given their low tensile strength, cement-based materials are very susceptible to cracking. These cracks serve as preferential pathways for corrosion inducing substances. For large concrete infrastructure works, currently available time-consuming manual repair techniques are not always an option. Often, one simply cannot reach the damaged areas and when making those areas accessible anyway (e.g., by redirecting traffic), the economic impacts involved would be enormous. Under those circumstances, it might be useful to have concrete with an embedded autonomous healing mechanism. In this paper, the effectiveness of incorporating encapsulated high and low viscosity polyurethane-based healing agents to ensure (multiple) crack healing has been investigated by means of capillary absorption tests on mortar while monitoring the time-dependent water ingress with neutron radiography. Overall visual interpretation and water front/sample cross-section area ratios as well as water profiles representing the area around the crack and their integrals do not show a preference for the high or low viscosity healing agent. Another observation is that in presence of two cracks, only one is properly healed, especially when using the latter healing agent. Exposure to water immediately after release of the healing agent stimulates the foaming reaction of the polyurethane and ensures a better crack closure.

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Neutron radiography determination of water diffusivity in fired clay brick

Cited by 39 publications

References 8 publications

Effects of microstructure on water imbibition in sandstones using X‐ray computed tomography and neutron radiography

Effects of microstructure on water imbibition in sandstones using X‐ray computed tomography and neutron radiography

A Coupled Reactive-Transport Model for Electrokinetic Remediation

Neutron Radiography Based Visualization and Profiling of Water Uptake in (Un)cracked and Autonomously Healed Cementitious Materials

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