NMR and MRI observation of water absorption/uptake in hemp shives used for hemp concrete

Fourmentin, M.; Faure, Paméla; Pelupessy, Philippe; Sarou‐Kanian, Vincent; Peter, Ulrike; Lesueur, Didier; Rodts, Stéphane; Daviller, D.; Coussot, Philippe

doi:10.1016/j.conbuildmat.2016.07.100

Cited by 33 publications

(15 citation statements)

References 21 publications

(25 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is typically the case of bio-based composite construction materials, made of a cementitious matrix in which biomaterial pieces such as wood or hemp are dispersed. Under the condition that water (free or bound) in the matrix exhibits a relaxation time sufficiently different from bound or free water in the biomaterial inclusions (otherwise the two peaks overlap and form one single peak), it is possible to follow the transfers of liquid during the different stages of evolution of such systems: liquid extraction from bio-inclusions to favour cement setting (Faure et al 2012), drying, adsorption of water in bio-inclusions (Fourmentin et al 2016), liquid transport through the matrix, etc. Imaging and relaxometry have been coupled to study the liquid transport in complex materials such as wood.…”

Section: Transfers In Complex Porous Mediamentioning

confidence: 99%

Progress in rheology and hydrodynamics allowed by NMR or MRI techniques

Coussot

2020

Exp Fluids

Self Cite

View full text Add to dashboard Cite

We review the uses of nuclear magnetic resonance techniques for experiments with fluids. More precisely we focus on the progress of knowledge in complex flows, rheology of complex fluids, flow in porous media, colloid transport, fluid transfers in complex porous systems, which have been allowed by NMR techniques. These achievements took advantage of the versatility of NMR, which makes it possible to carry out more original measurements than the basic well-known density imaging (MRI). One may thus rely on non-destructive, non-invasive, local velocimetry, local rheometry, statistical approaches of molecular displacements or velocity, distribution of adsorbed or suspended colloids, evolution of the liquid distribution in different states, fluid transfers during drying or imbibition, etc.

show abstract

Section: Transfers In Complex Porous Mediamentioning

confidence: 99%

Progress in rheology and hydrodynamics allowed by NMR or MRI techniques

Coussot

2020

Exp Fluids

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, the autogenous shrinkage of soil concrete having 40% clayey soil and 1.2% hemp fibers (40A1.2F) decreases significantly in comparison to that of soil concrete having 40% clayey soil and 0% hemp fibers (40A0F). This difference may be related to the variation of the global porosity between soil concrete mixes and the water absorption of hemp fibers [16,17]. The autogenous shrinkage of soil concrete having 1.2% hemps fibers is in the range of 600 -800 µm/m.…”

Section: Compressive Strength Of Soil Concretementioning

confidence: 99%

Design of a new soil concrete as an eco-material: Effect of clay and hemp fibers proportions

Chinh

Tan

2020

STCE

View full text Add to dashboard Cite

This study presents a series of soil concrete mix that is made of excavated soils, cement, lime and hemp fibers. An experimental program was carried out on the testing samples of soil concrete with different proportions of clayey soil and hemp fibers. This program focus on several properties of soil concrete, such as compressive strength, autogenous shrinkage, drying shrinkage and water mass loss with time. The obtained results show that the compressive strength of soil concrete increases even after 28 days, and can be reduced significantly with increasing the proportion of clayey soil. The effect of clayey soil on the properties tested of soil concrete is more than that of hemp fibers. In addition, drying shrinkage associated with water mass loss allows to describe the drying process of soil concrete. Keywords: soil concrete; hemp fibers; compressive strength; autogenous shrinkage; drying shrinkage; water mass loss.

show abstract

“…Imbibition, the process by which a wetting fluid displaces a nonwetting fluid from a porous medium, plays crucial roles in our lives. It underlies key energy processes, such as oil/gas recovery [1][2][3][4] and water management in fuel cells [5]; environmental processes, such as geological CO 2 sequestration [6][7][8][9], groundwater aquifer remediation [10,11], and moisture infiltration in soil and wood [12][13][14][15][16]; and diverse other applications including operation of chemical reactors [17] and wicking in fabrics [18,19], paper microfluidics [20], building materials [21][22][23], coatings [24], and diagnostic devices [25]. As a result, the physics of imbibition has been studied widely.…”

Section: Introductionmentioning

confidence: 99%

Forced Imbibition in Stratified Porous Media: Fluid Dynamics and Breakthrough Saturation

Lu,

Amchin,

Datta

2021

Preprint

View full text Add to dashboard Cite

Imbibition, the displacement of a nonwetting fluid by a wetting fluid, plays a central role in diverse energy, environmental, and industrial processes. While this process is typically studied in homogeneous porous media with uniform permeabilities, in many cases, the media have multiple parallel strata of different permeabilities. How such stratification impacts the fluid dynamics of imbibition, as well as the fluid saturation after the wetting fluid breaks through to the end of a given medium, is poorly understood. We address this gap in knowledge by developing an analytical model of imbibition in a porous medium with two parallel strata, combined with a pore network model that explicitly describes fluid crossflow between the strata. By numerically solving these models, we examine the fluid dynamics and fluid saturation left after breakthrough. We find that the breakthrough saturation of nonwetting fluid is minimized when the imposed capillary number Ca is tuned to a value Ca * that depends on both the structure of the medium and the viscosity ratio between the two fluids. Our results thus provide quantitative guidelines for predicting and controlling flow in stratified porous media, with implications for water remediation, oil/gas recovery, and applications requiring moisture management in diverse materials.

show abstract

NMR and MRI observation of water absorption/uptake in hemp shives used for hemp concrete

Cited by 33 publications

References 21 publications

Progress in rheology and hydrodynamics allowed by NMR or MRI techniques

Progress in rheology and hydrodynamics allowed by NMR or MRI techniques

Design of a new soil concrete as an eco-material: Effect of clay and hemp fibers proportions

Forced Imbibition in Stratified Porous Media: Fluid Dynamics and Breakthrough Saturation

Contact Info

Product

Resources

About