Macro and meso analysis of cement-based materials subjected to triaxial and uniaxial loading using X-ray microtomography and digital volume correlation

Lorenzoni, Renata; Lima, Victor Nogueira; Figueiredo, Tathiana Caram S.P.; Hering, Martin; Paciornik, Sidnei; Curbach, Manfred; Mechtcherine, Viktor; Silva, Flávio de Andrade

doi:10.1016/j.conbuildmat.2022.126558

Cited by 13 publications

(7 citation statements)

References 49 publications

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“…This range of values for cement paste Young's modulus agrees with previous measurements, e.g. [140,[206][207][208]. A reduction in the Young's modulus with increasing porosity is also expected based on previous observations, see e.g.…”

Section: Uniaxial Compressive Strengthsupporting

confidence: 92%

“…The porous cement paste displayed considerable plastic deformation at 10 MPa confining pressure and strain hardening at 20 MPa. Similar qualitative behavior was observed recently by Lima et al[140] and Lorenzoni et al[206]. The tendency toward continuous strain hardening and the lack of a clear ultimate deviatoric stress level under con-fining pressure is likely linked to compaction and pore closure within the samples[5].…”

supporting

confidence: 77%

“…The deviatoric loading phase was performed as per the uniaxial tests. All specimens underwent a rigorous preparation process, using self-fusing silicone tape and a heatshrinkable fluorinated ethylene propylene (FEP) membrane, as already described by Lima et al [140] and Lorenzoni et al [206]. Repeatability was controlled by repeating each test with three separate specimens.…”

Section: Uniaxial and Triaxial Compression Testsmentioning

confidence: 99%

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Chemo-Physico-Mechanical Behavior of Class G Oil Well Cement Pastes

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Section: Uniaxial Compressive Strengthsupporting

confidence: 92%

supporting

confidence: 77%

Section: Uniaxial and Triaxial Compression Testsmentioning

confidence: 99%

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Chemo-Physico-Mechanical Behavior of Class G Oil Well Cement Pastes

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“…Images written by the acquisition system in RAW format were imported to Fiji software, an open-source platform for three-dimensional image reconstruction, visualisation, processing, and analysis [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

“…In general, two objects with the same total volume and different S/V values differ by the complexity of their shapes. One of the commonly used shape factors for two-dimensional objects is the ratio of the perimeter and area of the objects [ 30 ]. Parameter A A is an area fraction of the sample surface covered by a WC-Co-AL 2 O 3 coating.…”

Section: Resultsmentioning

confidence: 99%

Nano X-ray Tomography Application for Quantitative Surface Layer Geometry Analysis after Laser Beam Modification

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Analysis of the geometrical structure of the surface of materials is an issue already widely recognised and included in international standards. The authors present the possibilities of extending the analysis of the coatings’ geometrical structure through X-ray nanotomography imaging, three-dimensional image processing, and stereological methods. Analysis of the state of the art reveals that there are no scientific rapports (indexed by Scopus) on the application X-ray nanotomography for analysis of the geometry of a coating. The presented study shows that this imaging technique can be applied and provide additional information on the quality of the layer. The comparative tests were carried out on samples with a cermet coating before and after laser treatment, including standard tests of the surface geometry and the analysis of three-dimensional images obtained from nanotomography. A set of parameters describing the compactness and thickness distribution of the applied coating is proposed, which facilitates the qualitative assessment of the application process and improvements through the additional processing of technological layers. The obtained results show that although the average thickness values before and after laser treatment did not differ significantly, their distribution on the sample surface was different, as presented in the visualisation. The determined stereological parameter NV (number of objects per unit volume) allowed for the assessment of the layer compactness, and as the analyses showed, this value decreased by more than two times after laser treatment. The analysis of the degree of sample coverage by the cermet layer showed that it increased from 70% to 95% after laser treatment, which confirms the treatment’s positive effect on the layer’s quality. This research shows that three-dimensional analysis significantly enriches the information about the geometry of the surface layer, providing data which other research techniques are unable to acquire.

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