Damage evolution analysis in mortar, during compressive loading using acoustic emission and X-ray tomography: Effects of the sand/cement ratio

Elaqra, Hossam A.; Godin, Nathalie; Peix, G.; R’Mili, Mohamed; Fantozzi, Gilbert

doi:10.1016/j.cemconres.2007.02.008

Cited by 106 publications

(40 citation statements)

References 21 publications

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“…The observed subsequent decrease of permeability with increasing damage, though seemingly contradictory, can be explained by the propagation of a macroscopic fracture which causes neighboring cracks to close, thus reversing the process of increasing pore network connectivity. The crack development in this material under compression has previously been analyzed by [Elaqra et al, 2007] and showed similarities with such observations.…”

Section: Water Vapour Permeability 421 Methods 1: Square Root Of Timementioning

confidence: 59%

“…While these assumptions could be accurate at the time of construction of a building, they could be a strong source of calculation errors as the building ages and its components start to present various forms of degradation. Fractures in cementitious materials can be caused by various phenomena: compressive and tensile mechanical loading and fatigue phenomena causing progressive microstructural dislocations [Elaqra et al, 2007], cyclic expansion of the material due to thermal cycles, degradation caused by sorption and desorption cycles, transport of reacting chemicals through water such as chloride ions. Microcracking first occurs during the maturation and hydration processes in Portland cement as a result of drying shrinkage [Bažant and Raftshol, 1982].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Diffuse Damage on the Water Vapour Permeability of Fibre-Reinforced Mortar

et al. 2012

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The study of moisture transfer inside building materials is an important issue in building physics. The hygric characterization of such materials has become a common practice for the estimation of the hygrothermal performance of buildings. However, their aging caused by mechanical loading and environmental factors inevitably affects their permeability to moisture ingress, and the knowledge of how this permeability is affected by damage and cracks is still incomplete.The effects of diffuse damage caused by mechanical loading on the water vapour permeability of fibre-reinforced mortar were studied. A full experimental setup is presented including observation of the porous structure, mechanical, and hygric characterization. Uniaxial tensile loading was applied on prismatic samples while their damage level was measured. Then, the moisture content of damaged and undamaged samples was monitored during variations of ambient relative humidity. Two numerical methods are presented and used for the comparison of the water vapour permeability of multiple samples presenting various levels of damage. By this methodology, diffuse damage caused by mechanical loading is shown to have an impact on the water vapour transfer inside the material.

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Section: Water Vapour Permeability 421 Methods 1: Square Root Of Timementioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Influence of Diffuse Damage on the Water Vapour Permeability of Fibre-Reinforced Mortar

et al. 2012

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“…Unfortunately, digital quantification of material damage is a complex process that involves high computational costs due to the irregular and non-uniform microstructures and defects within material domains. Digital radiography and computed tomography of T-ray [1], gamma ray [2], neutron [3], synchrotron [3], ion beam [4], and X-ray [5][6][7][8][9][10][11][12][13] generate a huge number of two-dimensional/three-dimensional (2D/3D) digital images, in which immense amounts of material defect data are embedded.…”

Section: Introductionmentioning

confidence: 99%

GPU/CPU parallel computation of material damage

Shen

Singh

Song

et al. 2014

Engineering with Computers

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In this paper compute unified device architecture programming and open multiprocessing are used for the graphics processing unit and central processing unit parallel computation of material damage. The material damage is evaluated by a multilevel finite element analysis within material domains reconstructed from a high-resolution micro-focus X-ray computed tomography system. An effective computational method is investigated for solving the linear equations of finite element analysis. Numerical results show an encouraging trend in reducing the computation cost for the digital diagnosis of material damage.

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“…Wang et al (2003) visualized voids or cracked surfaces using X-ray CT, and suggested a damage tensor for representing damage. Elaqra et al (2007) explores the use of acoustic emission (AE) and X-ray tomography to identify the mechanisms of damage and the fracture process during compressive loading on mortar specimens. Recently, Sugiyama et al (2010) applied the synchrotron X-ray CT at Spring 8 with a resolution of 0.5μm to the deteriorated mortal, then visualized pore space and made clear diffusion tortuosity in the pore evaluated by random walk simulation.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Micro-damage of Concrete Specimens under Cyclic Uniaxial Loading by X-ray CT Method

Tanikura

Jung

Shintani

et al. 2016

ACT

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The X-ray CT method was applied to evaluate micro-damage -namely, deterioration of concrete specimens under cyclic uniaxial loading tests. The μ-focus X-ray CT scanner was used. Concrete cylinders with a diameter of 50 mm and a length of 100 mm were prepared as specimens. Cyclic uniaxial loading tests were conducted on the specimens. The X-ray CT images of the specimens were taken at the loading level 0, 60, 70, 80 and 90 percent of their uniaxial compressive strength. For three dimensional CT images of the specimen, the Three Dimensional Medial Axis Analysis (3DMA) method was applied to evaluate porosity and width, length, persistence of cracks which represent deterioration of the specimen. As the results, slight micro-fracturing occurs until a loading level R = 60%, and starts to increase at R of 60% to 70%. The cracking occurs in a part of the mortar near boundary between aggregate and mortar, and the crack links to another crack with increasing loading level. The degree of cracking varies according to the position dependent on the final apparent fracture surface of the specimen. It is concluded that the X-ray CT method with 3DMA is effective for not only evaluating the state of micro-cracking within the specimen, but also estimating the process of deterioration of the specimen with an increasing loading level.

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Damage evolution analysis in mortar, during compressive loading using acoustic emission and X-ray tomography: Effects of the sand/cement ratio

Cited by 106 publications

References 21 publications

Influence of Diffuse Damage on the Water Vapour Permeability of Fibre-Reinforced Mortar

Influence of Diffuse Damage on the Water Vapour Permeability of Fibre-Reinforced Mortar

GPU/CPU parallel computation of material damage

Evaluation of Micro-damage of Concrete Specimens under Cyclic Uniaxial Loading by X-ray CT Method

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