Pore segmentation of cement-based materials from backscattered electron images

Wong, H.S.; Head, M.K.; Buenfeld, N.R.

doi:10.1016/j.cemconres.2005.10.006

Cited by 358 publications

(102 citation statements)

References 18 publications

(21 reference statements)

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“…The reproducible contrast of BSE images makes them well suited to use in achieving this aim. Scrivener et al (1986) have shown that the amount of unreacted cement measured by BSE and image analysis corresponds well with independent measures of hydration, and this has also been demonstrated to be highly effective for determination of the extent of reaction of supplementary cementitious materials in blends containing PC (Wong et al, 2006;Scrivener et al, 2015). However, the situation is likely to be different for the study of porosity, which is usually present in discrete regions that are much smaller than the anhydrous cement (or slag) particles.…”

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confidence: 95%

“…However, the situation is likely to be different for the study of porosity, which is usually present in discrete regions that are much smaller than the anhydrous cement (or slag) particles. Wong et al (2006) also demonstrated the determination of the porosity threshold from the inflection point of the cumulative brightness histogram of the gray levels within a micrograph, and showed that this method provides reliable results for materials based on PC.…”

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confidence: 99%

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The Interfacial Transition Zone in Alkali-Activated Slag Mortars

Nicolas

Provis

2015

Front. Mater.

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The interfacial transition zone (ITZ) is known to strongly influence the mechanical and transport properties of mortars and concretes. This paper studies the ITZ between siliceous (quartz) aggregates and alkali-activated slag (AAS) binders in the context of mortar specimens. Backscattered electron (BSE) images generated in an environmental scanning electron microscope (ESEM) are used to identify unreacted binder components, reaction products, and porosity in the zone surrounding aggregate particles, by composition and density contrast. X-ray mapping is used to exclude the regions corresponding to the aggregates from the BSE image of the ITZ, thus, enabling analysis of only the binder phases, which are segmented into binary images by gray level discrimination. A distinct yet dense ITZ region is present in the AAS mortars, containing a reduced content of unreacted slag particles compared to the bulk binder. The elemental analysis of this region shows that it contains a (C,N)-A-S-H gel that seems to have a higher content of Na (potentially deposited through desiccation of the pore solution) and a lower content of Ca than the bulk inner and outer products forming in the main binding region. These differences are potentially important in terms of long-term concrete performance, as the absence of a highly porous ITZ region is expected to provide a positive influence on the mechanical and transport properties of AAS concretes.

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confidence: 95%

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The Interfacial Transition Zone in Alkali-Activated Slag Mortars

Nicolas

Provis

2015

Front. Mater.

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“…14e and 14f) and the overflow criterion for the pore segmentation (Fig. 14b) proposed by Wong et al (2006). More details about these two methods can be found in (Gao et al 2013a), where image analysis was used to examine the interface around aggregates in mortar specimens.…”

Section: Image Analysismentioning

confidence: 99%

Micromechanical Study of the Interface Properties in Concrete Repair Systems

Luković

Šavija

Dong

et al. 2014

ACT

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Micromechanical interface properties in a concrete repair system determine the performance and reliability of a repaired structure. In order to characterize these properties, nanoindentation technique was applied. Three different repair material mixtures, based on Portland cement or partial replacement of Portland cement with blast furnace slag, were tested. Hardness and elastic modulus values obtained from the nanoindentation were used directly as input for simulated direct tension test. This way, the fracture behaviour of original microstructure, "mimicked" by Delft lattice model, is analysed. Backscattered electron (BSE) image analysis is utilized to estimate the average size of the interface zone which is distinguished as locally more porous area. This, together with simulation results, is further used for calculation of the interface stiffness. Simulation results enable prediction and better insight into fracture propagation and micromechanical response of the tested zone. They also indicate the ratio between interface and bulk material fracture properties when different types of repair materials are used. Load displacement diagrams of interface, old and new material can serve as an input for numerical modelling and understanding of fracture behaviour of the repair systems at the higher scale. Potentially, this approach may develop as a tool for verifying and engineering interface properties such that desired performance of the repaired structure is achieved.

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“…As the threshold value increases, firstly, the porosity will increase gradually and then after the value reaching a critical value, the porosity will increase dramatically. This critical point where the porosity starts to increase suddenly can be a suitable upper threshold value to segment the images [13]. After that, we converted the grayscale image into binary image and studied the pore structures by using ImagJ which is common commercial image analysis software.…”

Section: Image Processingmentioning

confidence: 99%

Characterization and Quantification of the Pore Structures of the Shale Oil Reservoir Formations in Multiscale

Liu¹,

Ostadhassan²

2017

J Geol Geophys

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Pore structures can significantly impact the mechanical and physical properties of the rock such as permeability, strength and durability. Understanding the microstructures of the rocks accurately and quantitatively is essential to petroleum engineering for evaluating and development of oil and gas, especially for the unconventional reserves with abundant interior nanoscale pores such as shale. In this paper, we studied the pore structures of rock samples from Middle Bakken Formation which is a typical unconventional reservoir in North America. High resolution SEM images of five samples were derived after sample preparation. After determining the threshold of the images, we extracted the pore spaces at various magnifications and determined the representative elementary area (REA). Then we analyzed the pore structures properties such as pore size distributions and pore shape distributions of the five samples at their representative elementary area and applied statistics analysis method to compare their distributions. After that, we analyzed their heterogeneity and isotropy properties which have been identified as an important factor affecting reservoir productivity.

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Pore segmentation of cement-based materials from backscattered electron images

Cited by 358 publications

References 18 publications

The Interfacial Transition Zone in Alkali-Activated Slag Mortars

The Interfacial Transition Zone in Alkali-Activated Slag Mortars

Micromechanical Study of the Interface Properties in Concrete Repair Systems

Characterization and Quantification of the Pore Structures of the Shale Oil Reservoir Formations in Multiscale

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