Microstructure and transport properties of porous building materials. II: Three-dimensional X-ray tomographic studies

Bentz, Dale P.; Quénard, Daniel; Künzel, Hartwig M.; Baruchel, J.; Peyrin, Françoise; Martys, Nicos; Garboczi, Edward J.

doi:10.1007/bf02479408

Cited by 105 publications

(54 citation statements)

References 13 publications

(20 reference statements)

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“…Synchrotron-based microtomography have been used to porous building materials [4], as well as, to other cementitious materials [5][6][7][8][9] by various researchers in the US and Europe. At SPring-8, a third-generation synchrotron radiation facility in Japan, the pore structure of hardened cement pastes and mortar was also examined at a sub-micron resolution [10][11].…”

Section: Introductionmentioning

confidence: 99%

Quantification of tortuosity in hardened cement pastes using synchrotron-based X-ray computed microtomography

Promentilla

Sugiyama

Hitomi

et al. 2009

Cement and Concrete Research

242

108

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Tortuosity, as being influenced by the 3D pore micro-geometry, is an important physical quantity to understand better the effect of pore structure on transport properties of cement-based materials. This study attempts to evaluate directly this pore structure-transport parameter from the microtomographic images at spatial resolution of 0.5 µm. This resolution, is by far, to our knowledge, the highest resolution reported for 3D non-invasive imaging of hardened cement pastes. The results show the feasibility of using synchrotron microtomography coupled with 3D image analysis and random walk simulation to measure the diffusion tortuosity that has a direct bearing on transport properties. The tortuosity associated with the percolating pore space seems to reflect the pore morphology that mainly controls the transport properties in young cement pastes; thus, explaining the rough agreement of the results with the computer model or experimental evidence.

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Section: Introductionmentioning

confidence: 99%

Quantification of tortuosity in hardened cement pastes using synchrotron-based X-ray computed microtomography

Promentilla

Sugiyama

Hitomi

et al. 2009

Cement and Concrete Research

242

108

View full text Add to dashboard Cite

show abstract

“…There is, however, a trade-off, such that the maximum sample size for the higher-resolution systems is limited to less than a few millimeters, whereas specimens on the scale of a few centimeters may be used with lower resolution systems. For cement-based materials, X-ray CT has been applied to a variety of research areas including pore structure characterization and freeze-thaw damage (Bentz et al 2000;Burlion et al 2006;Gallucci et al 2007;Helfen et al 2005;Lu et al 2006;Hitomi et al 2004;Promentilla et al 2008Promentilla et al , 2009Promentilla et al , 2010Sugiyama et al 2010).…”

Section: 3mentioning

confidence: 99%

Application of X-Ray CT to Study Diffusivity in Cracked Concrete Through the Observation of Tracer Transport

Darma

Sugiyama

Promentilla

2013

ACT

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This paper demonstrates the application of microfocus X-ray computed tomography (CT) to study solute transport in cracked concrete. Cracks in a cylindrical specimen of ordinary Portland cement (OPC) and fly ash mortar were induced using a splitting tensile test. Cesium Carbonate (Cs 2 CO 3 ) was then used as a tracer in the in-situ diffusion test with the aid of X-ray CT. Image analysis was also employed to measure the 3D crack geometry and tracer diffusivity from these CT images. The geometric tortuosity of the crack was approximately 1.25 irrespective of the crack opening width and whether fly ash was added or not. On the other hand, the constrictivity increased for the fly ash mortar having roughly the equivalent crack opening width. The measured diffusivity in the crack was controlled by both crack opening width and constrictivity. Results obtained from microtomographic images suggest that the entire crack space may not always be filled with the tracer. The diffusive transport of solute in cracks thus can be restricted from microstructure's point of view. Smaller crack opening would increase such restricted diffusion. Indications also suggest that the addition of fly ash would lead to the reduction of diffusivity through uncracked body of the mortar.

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“…Direct measurement of a 3D structure is now available via micro X-ray computed microtomography [5,12,54]. These techniques provide the opportunity to experimentally measure the complex morphology of a range of materials in three dimensions at [a] [b] resolutions down to 5 µm and lower.…”

Section: Experimental Images From Microtomographymentioning

confidence: 99%

Characterising the Morphology of Disordered Materials

Arns

Knackstedt

Mecke

2002

Morphology of Condensed Matter

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Abstract. We introduce Minkowski functionals to characterise, reconstruct and discriminate different complex material microstructures, for instance, experimental data sets generated from X-ray computer tomography imaging; samples include a suite of Fontainebleau sandstone, and a heterogeneous cross-bedded sandstone. Three distinct classes of digitised complex microstructure are considered: particle based Boolean models, structures generated by level-cuts through Gaussian fields, and models based on a Voronoi tesselation of space. One can define a set of measures for random composite media from a single image at any phase fraction φ which allows one to accurately reconstruct the medium for all other phase fractions and to predict, for instance, the percolation threshold pc. The evolution of the Minkowski functions during erosion and dilation operations on non-convex morphologies leads to a very accurate discrimination of morphologybetter than commonly used techniques such as structure functions or chord length distributions. Spatial Structures: Experimental Data and Stochastic ModelsThe structure of a disordered material -an oil bearing rock, a piece of paper, or a polymer composite -is a remarkably incoherent concept. Despite this, scientists and engineers are asked to predict the properties of a disordered material based on the "structure" of its constituent components. A major shortcoming in the understanding of processes involving complex materials has been an inability to accurately characterize microstructure. The specification of "structure" requires topological as well as geometric descriptors to characterize the connectivity and the shape of the spatial configuration. In oil recovery from petroleum reservoir rocks, an area of particular interest to the authors, recovery depends crucially on the topology of the pore space and on the mean curvature of the surfaces where immiscible phases meet at a contact angle. To determine accurate flow models and to devise intelligent recovery strategies requires an accurate characterization of reservoir rocks in terms of topology and geometry.To date, the main toolkit used to quantify complex structures has been primarily that of the statistical physicist and not the advanced techniques developed in spatial statistics [11,59]

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Microstructure and transport properties of porous building materials. II: Three-dimensional X-ray tomographic studies

Cited by 105 publications

References 13 publications

Quantification of tortuosity in hardened cement pastes using synchrotron-based X-ray computed microtomography

Quantification of tortuosity in hardened cement pastes using synchrotron-based X-ray computed microtomography

Application of X-Ray CT to Study Diffusivity in Cracked Concrete Through the Observation of Tracer Transport

Characterising the Morphology of Disordered Materials

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