Michele Griffa
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View article: Fracture in concrete: X-ray tomography with in-situ testing, digital volume correlation and phase-field modeling
Fracture in concrete: X-ray tomography with in-situ testing, digital volume correlation and phase-field modeling Open
We test and simulate the mesoscopic cracking behavior of specimens made of a standard concrete mixture. To this end, we combine stable wedge-splitting fracture experiments performed during X-ray tomography, their analysis with digital volu…
View article: Low-carbon MgO/hydromagnesite binders – effect of moisture state on the evolution of mechanical properties
Low-carbon MgO/hydromagnesite binders – effect of moisture state on the evolution of mechanical properties Open
We studied the mechanical properties of MgO/hydromagnesite mortars cured at 20 °C both in humid (98 %RH) and dry (57 %RH) environments. The linear storage Young's modulus was determined with quasi-static loading and dynamically by SIngle M…
View article: Probing the steel-concrete interface microstructure using FIB-SEM nanotomography
Probing the steel-concrete interface microstructure using FIB-SEM nanotomography Open
While it is widely accepted that the steel-concrete interface (SCI) plays an important role in governing the long-term durability of reinforced concrete structures, the understanding about the primary features of the SCI that influence cor…
View article: Fracture in concrete: X-ray tomography with in-situ testing, digital volume correlation and phase-field modeling
Fracture in concrete: X-ray tomography with in-situ testing, digital volume correlation and phase-field modeling Open
We test and simulate the mesoscopic cracking behavior of specimens made of a standard concrete mixture. To this end, we combine stable wedge-splitting fracture experiments performed during X-ray tomography, their analysis with digital volu…
View article: Mitigation of plastic shrinkage cracking with natural fibers - kenaf, abaca, coir, jute and sisal
Mitigation of plastic shrinkage cracking with natural fibers - kenaf, abaca, coir, jute and sisal Open
In this study, a number of different fibers - namely kenaf, jute, abaca, coir and sisal - were investigated as natural alternatives to polypropylene (PP) fibers for reducing plastic shrinkage cracking. The risk of plastic shrinkage crackin…
View article: Multi-scale mechanical and acoustic characterization of low noise pavements
Multi-scale mechanical and acoustic characterization of low noise pavements Open
Using data on in situ performance of low noise pavements, three well performing mixtures were selected: SDA 4, SDA 6, and SDA 8. These mixtures and the corresponding mastic (filler + bitumen + additive) were tested for their mechanical and…
View article: Phase Saturation Control on Vorticity Enhances Mixing in Porous Media
Phase Saturation Control on Vorticity Enhances Mixing in Porous Media Open
Mixing controls the fate of any solute entering porous media. Hence, an understanding of the involved processes is essential for assessing subsurface contamination and planning for its protection. However, the three‐dimensional mechanisms …
View article: FIB-SEM tomograms of the steel-concrete interface of mortar and concrete specimens
FIB-SEM tomograms of the steel-concrete interface of mortar and concrete specimens Open
This datasets contains tomograms showing the steel-concrete interface of mortar (files starting with NCI) and concrete (files starting with CI) specimens. They were acquired by a FIB-SEM (focused ion beam-scanning electron microscope). The…
View article: FIB-SEM tomograms of the steel-concrete interface of mortar and concrete specimens
FIB-SEM tomograms of the steel-concrete interface of mortar and concrete specimens Open
This datasets contains tomograms showing the steel-concrete interface of mortar (files starting with NCI) and concrete (files starting with CI) specimens. They were acquired by a FIB-SEM (focused ion beam-scanning electron microscope). The…
View article: Digital twins of the steel-concrete interface based on FIB-SEM tomograms
Digital twins of the steel-concrete interface based on FIB-SEM tomograms Open
This dataset contains four digital twins of the steel concrete interface (SCI), i.e. segmented tomograms of the SCI acquired by means of a FIB-SEM microscope. More information can be found here: (TBD)
View article: Digital twins of the steel-concrete interface based on FIB-SEM tomograms
Digital twins of the steel-concrete interface based on FIB-SEM tomograms Open
This dataset contains four digital twins of the steel concrete interface (SCI), i.e. segmented tomograms of the SCI acquired by means of a FIB-SEM microscope. More information can be found here: (TBD)
View article: X-ray tomographic datasets associated with the article "Pore space of in-situ semi-dense asphalt: A characterization by X-ray tomography" (DOI: 10.1016/j.conbuildmat.2024.139091)
X-ray tomographic datasets associated with the article "Pore space of in-situ semi-dense asphalt: A characterization by X-ray tomography" (DOI: 10.1016/j.conbuildmat.2024.139091) Open
This Zenodo repository provides two sets of 3D images, which constitute part of the dataset base for the article titled "Pore space of in-situ semi-dense asphalt: A characterization by X-ray tomography", written by the same authors cited h…
View article: X-ray tomographic datasets associated with the article "Pore space of in-situ semi-dense asphalt: A characterization by X-ray tomography" (DOI: 10.1016/j.conbuildmat.2024.139091)
X-ray tomographic datasets associated with the article "Pore space of in-situ semi-dense asphalt: A characterization by X-ray tomography" (DOI: 10.1016/j.conbuildmat.2024.139091) Open
This Zenodo repository provides two sets of 3D images, which constitute part of the dataset base for the article titled "Pore space of in-situ semi-dense asphalt: A characterization by X-ray tomography", written by the same authors cited h…
View article: Quantitative analysis of the evolution of ASR products and crack networks in the context of the concrete mesostructure
Quantitative analysis of the evolution of ASR products and crack networks in the context of the concrete mesostructure Open
Methodological challenges have long been an obstacle for the understanding of damage in concrete due to the alkali-silica reaction (ASR). Time-lapse X-ray tomography could be key to advancements but has not been extensively exploited, main…
View article: Supplementary data for the article: "Quantitative analysis of the evolution of ASR products and crack networks in the context of the concrete mesostructure"
Supplementary data for the article: "Quantitative analysis of the evolution of ASR products and crack networks in the context of the concrete mesostructure" Open
Abstract Methodological challenges have long been an obstacle for the understanding of damage in concrete due to the alkali-silica reaction (ASR). Time-lapse X-ray tomography could be key to advancements but has not been extensively exploi…
View article: Alkali-silica reaction – a multidisciplinary approach
Alkali-silica reaction – a multidisciplinary approach Open
In the last four years, a multidisciplinary study involving several research groups in Switzerland tackled a number of unsolved, fundamental issues about the alkali-silica reaction (ASR) in concrete. The covered topics include SiO2 dissolu…
View article: X-ray speckle-based dark-field imaging of water transport in porous ceramics
X-ray speckle-based dark-field imaging of water transport in porous ceramics Open
The evaluation of liquid transport through porous ceramics are of high importance in numerous applications of these materials, ranging from chemical and physical filters to biomaterials. We present a proof-of-concept of the capability of s…
View article: Alkali-silica reaction products and cracks: X-ray micro-tomography-based analysis of their spatial-temporal evolution at a mesoscale
Alkali-silica reaction products and cracks: X-ray micro-tomography-based analysis of their spatial-temporal evolution at a mesoscale Open
In this study, we propose a laboratory-scale methodology, based on X-ray micro-tomography and caesium (Cs) as a contrast agent, to advance the understanding of cracking due to alkali-silica reaction (ASR) in concrete. The methodology allow…
View article: Time Resolved in situ X-Ray Tomographic Microscopy Unraveling Dynamic Processes in Geologic Systems
Time Resolved in situ X-Ray Tomographic Microscopy Unraveling Dynamic Processes in Geologic Systems Open
X-ray tomographic microscopy is a well-established analysis technique in different fields of the Earth Sciences to access volumetric information of the internal microstructure of a large variety of opaque materials with high-spatial resolu…
View article: Bond Performance of Sand Coated UHM CFRP Tendons in High Performance Concrete
Bond Performance of Sand Coated UHM CFRP Tendons in High Performance Concrete Open
The bond behaviour of novel, sand-coated ultra-high modulus (UHM) carbon fibre reinforced polymers (CFRP) tendons to high performance concrete (HPC) was studied by a combined numerical and experimental approach. A series of pull-out tests …
View article: Advancing the visualization of pure water transport in porous materials by fast, talbot interferometry-based multi-contrast x-ray micro-tomography
Advancing the visualization of pure water transport in porous materials by fast, talbot interferometry-based multi-contrast x-ray micro-tomography Open
The spatio-temporal distribution (4D) of water in porous materials plays a fundamental role in many natural and technological processes. The dynamics of water transport is strongly entangled with the material's pore-scale structure. Unders…