Analysis of cement-bonded materials by multi-cycle mercury intrusion and nitrogen sorption

Kaufmann, Josef; Loser, Roman; Leemann, Andreas

doi:10.1016/j.jcis.2009.05.029

Cited by 191 publications

(109 citation statements)

References 22 publications

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“…4). Subtraction of the second cycle from the first cycle gives the size of the neck pore entrances at which the 'ink-bottle type pores' become 25 filled (Kaufmann, 2010;Kaufmann et al, 2009). All errors of this technique fall into the 5 vol% range.…”

Section: Mercury Intrusion Porosimetry (=Mip)mentioning

confidence: 99%

Multiscale porosity estimates along the pro-and retrograde deformation path: an example from Alpine slates

Akker¹,

Kaufmann²,

Desbois³

et al. 2018

Preprint

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Abstract. Estimating porosity of slates is of great interest for the recently rising industries dealing with the underground such as CO2 sequestration, nuclear waste disposal and shale gas but also for engineering purposes in 15 terms of mechanical stability for underground or surface constructions. In this study, we aim understanding Additionally, porosity and pore morphology are strongly dependent on mineralogy, sample homogeneity and 30 strain.

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Section: Mercury Intrusion Porosimetry (=Mip)mentioning

confidence: 99%

Multiscale porosity estimates along the pro-and retrograde deformation path: an example from Alpine slates

Akker¹,

Kaufmann²,

Desbois³

et al. 2018

Preprint

Self Cite

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“…The total porosity from experimental MIP is 23.39%. 11.29% porosity refers to ink-bottle pores 45 , which are more difficult to get emptied or re-filled during drying. The remaining 12.1% porosity refers to pores with more homogeneous geometry, thus easier to be dried up or re-filled.…”

Section: X107mentioning

confidence: 99%

Advancing the visualization of pure water transport in porous materials by fast, talbot interferometry-based multi-contrast x-ray micro-tomography

et al. 2016

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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. Understanding their correlation requires imaging simultaneously the 4D water distribution and the porous microstructure. To date, 4D images with high temporal and spatial resolution have been mainly acquired by attenuation-based X-ray micro-tomography, whereby pure water is substituted by saline solutions with high atomic number components to improve image contrast. The use of saline solutions is however not always desirable, as the altered fluid properties may affect the transport process as well or, as it is the case for hydrating cement-based materials, they may modify the chemical reactions and their kinetics. In this study, we aimed at visualizing pure water transport in porous building materials by a new implementation of fast Talbot interferometry-based multi-contrast X-ray micro-tomography at the P07 beamline of the Helmholtz-Zentrum Geesthacht at DESY. We report results from a mortar specimen imaged at three different stages during evaporative drying. We show the possibility of visualizing simultaneously the microstructure and the pore-scale water redistribution by the phase contrast images. In addition, different solid material phases are clearly distinguished in these images. The higher contrast between water and the porous substrate, achievable in the phase contrast images, compared with the attenuation ones, empowers new analysis and allows investigating the correlation between the drying process and the porous microstructure. The approach offers the possibility of studying other chemically inert or reactive water transport processes without any chemical or physical perturbation of the processes themselves.

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“…There are different-size pores including capillary pores, small gel pores and so on in the position of CPB, and four size ranges of pore distribution can be defined as large capillary pores (> 100 nm), middle capillary pores (50-100 nm), meso-pores (4.5-50 nm) and gel micropores (< 4.5 nm) [26]. The pore network systems of CPB may be considered as a network of large spaces (large and middle capillary pores) interconnected by narrow channels (smaller capillary or gel pore) [27]. The MIP results show that the porosity decreases with the increase of fly ash dosage, and that the porosity development closely relates to the reaction degree in CPB [28].…”

Section: Effects Of Fine Gangue Content On Microstructure Of Cpbmentioning

confidence: 99%

Effects of Fly Ash Content on Properties of Cement Paste Backfilling

Qi¹,

Feng²,

Zhāng³

et al. 2015

JRST

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ABSTRACT:Fly ash has been considered as an ideal raw material component of cement paste backfilling (CPB) due to its good pozzolanic activity. In this study, the effects of fly ash content (340-420 kg/m 3 ) on the compressive strength, resistivity and microscopic characteristics of CPB were investigated. The results indicated that at the early curing age, the resistivity decreased with increasing fly ash content, while the compressive strength did not vary significantly; at the curing times of 7 d, 14 d and 28 d, the compressive strength exhibited an increasing trend because of the higher content of reaction products and the compaction of pore structure, and the resistivity also increased due to the decreased ionic concentrations of pore solution and the greater resistance to transporting current through the pore network system. Apparently, there existed a linear relationship between the compressive strength and the resistivity of CPB samples.

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Analysis of cement-bonded materials by multi-cycle mercury intrusion and nitrogen sorption

Cited by 191 publications

References 22 publications

Multiscale porosity estimates along the pro-and retrograde deformation path: an example from Alpine slates

Multiscale porosity estimates along the pro-and retrograde deformation path: an example from Alpine slates

Advancing the visualization of pure water transport in porous materials by fast, talbot interferometry-based multi-contrast x-ray micro-tomography

Effects of Fly Ash Content on Properties of Cement Paste Backfilling

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