In situ characterisation of the depth and mass of water intrusion in unsaturated cement pastes via X-ray computed tomography

Li, Yong; Wang, Jiapei; Zhang, Yunsheng; Lv, Henglin; Fu, Pengchen; Li, Anxin

doi:10.1680/jadcr.16.00056

Cited by 7 publications

(3 citation statements)

References 36 publications

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“…The dynamic process of water transport in porous materials can be monitored by Neutron Radiography (NR) [18–21], Nuclear Magnetic Resonance (NMR) [22–25], Gamma ray [26] and X-ray Computed Tomography (X-ray CT) [11,27]. Based on these techniques, the distance of water uptake in material can be determined and the capillary coefficient can be calculated as follows:x=k⋅t1/2,where, x is the distance of water uptake (m) and k is the capillary coefficient (m/s 1/2 ).…”

Section: Introductionmentioning

confidence: 99%

Relationship between sorptivity and capillary coefficient for water absorption of cement-based materials: theory analysis and experiment

et al. 2019

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The durability of cement-based materials depends on the property of water absorption. In this work, a technique of X-ray CT combined with CsCl enhancing was used to continuously monitor the dynamic process of water uptake in cement-based materials and the gravimetric method was used to measure the amount of water absorption. The relationship between the capillary coefficient ( k ) and sorptivity ( S ) was firstly established based on theory analysis and well verified by the experiment results. In accordance with theory analysis and experiment results, it is found that the ratio of sorptivity to capillary coefficient equals the porosity ( φ ) of materials, i.e. S / k = φ . This model provides a simple method for obtaining the capillary coefficient of porous materials from the measurement of sorptivity and porosity.

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Section: Introductionmentioning

confidence: 99%

Relationship between sorptivity and capillary coefficient for water absorption of cement-based materials: theory analysis and experiment

et al. 2019

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“…In 1960-70s methods of physical and physico-chemical analysis of the structure of building composites were formed and later developed. Currently this field includes [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]: -Petrographic analysis -Comprehensive chemical analysis -Calorimetry -Differential thermal and thermogravimetric analysis -X-ray phase analysis -X-ray diffraction analysis -Infrared spectroscopy -Scanning electron microscopy -Atomic force microscopy -Microhardness testing of substance and contact zones -Porometry (optical, hygrometric, mercury) -Stereometry of the structure of composites, etc.…”

Section: Introductionmentioning

confidence: 99%

Statistical validity of quantitative assessment of the structure of building composites for sustainable development

Makeev¹

2023

E3S Web Conf.

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This paper proposes the problem of the complexity and consistency of a qualitative description and the reliability of a quantitative assessment of the characteristics of the structure of building composites. The results of an experimental assessment of the statistical error in identifying the structure of building composites (by the example of silicate microconcrete) by the methods of X-ray phase and differential thermal analysis are presented in comparison with the relative error of mechanical tests of the material. It is shown that under the condition of setting technological factors under control, the statistical variability of the composition and structure of the material does not exceed 5-7%, and the physical and mechanical properties are at the level of 10%.

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“…Application of CT technique in understanding the concrete behaviour dates back to 1980 Morgan et al [22]. CT gained popularity in the recent decade for visualizing parameters such as pore network, hydration process, permeability [23], chemical effects, thermal effects [24], carbonation [25], failure patterns [26,27] etc. under different test conditions [28,29].…”

Section: Introductionmentioning

confidence: 99%

Visualization and quantification of aggregate and fiber in self-compacting concrete using computed tomography for wedge splitting test

Rajeshwari

Sivakumar

Praneeth³

2020

Archiv.Civ.Mech.Eng

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Wedge splitting test gained popularity as a stable and simple method to predict the fracture mechanism properties of concrete specimens. The present research focuses on understanding the behavior of self-compacting concrete specimens made with and without steel fibers tested using wedge splitting test, later scanned under high resolution computed tomography. The contribution of hooked end steel fiber and coarse aggregates in fiber reinforced specimens was compared without steel fiber reinforced concrete specimens using high resolution computed tomography. As fracture takes place across the plane perpendicular to the splitting force, i.e. along the depth of specimens. High resolution computed tomography technique was adopted in visualizing the changes taking place across the matrix, coarse aggregate and steel fibers, along with the specimen's depth. Datasets of the images, obtained from computed tomography, after images analysis and volume reconstruction, revealed a higher coarse aggregate and steel fiber participation in the failure region of without and with fibers specimens. Computed tomography investigation indicated a total of 23 coarse aggregate and 64 steel fibers participated in resisting the failure, during wedge splitting test of without and with fibers specimens. Therefore, high resolution computed tomography can be used in understanding, quantifying the participation of coarse aggregate and steel fiber in the failure plane, under fracture loads.

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In situ characterisation of the depth and mass of water intrusion in unsaturated cement pastes via X-ray computed tomography

Cited by 7 publications

References 36 publications

Relationship between sorptivity and capillary coefficient for water absorption of cement-based materials: theory analysis and experiment

Relationship between sorptivity and capillary coefficient for water absorption of cement-based materials: theory analysis and experiment

Statistical validity of quantitative assessment of the structure of building composites for sustainable development

Visualization and quantification of aggregate and fiber in self-compacting concrete using computed tomography for wedge splitting test

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