Effects of technological parameters on permeability estimation of partially saturated cement paste by a DEM approach

Li, Kai; Stroeven, Martijn; Stroeven, Piet; Sluys, L.J.

doi:10.1016/j.cemconcomp.2017.09.013

Cited by 15 publications

(22 citation statements)

References 45 publications

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“…By combining the motion equation (Navier-Stokes hydrodynamic equation) with mass conservation (continuity equation), the steady-state incompressible fluid flow in cement paste may be described by Eqs. (4) and (5) (Yang et al 2012;Zalzale and McDonald 2012;Sun et al 2014;Li et al 2017a),…”

Section: Modeling Permeability Of Cement Pastementioning

confidence: 99%

“…It is reported that moisture transport, which belongs to laminar flow and follows Darcy's law in the capillary pore network of cementitious media, remains fairly slow. (Ye et al 2006;Picandet et al 2011;Li et al 2017a). Based on Darcy's law, the intrinsic permeability of RVE specimen of cement paste is usually measured in the laboratory by permeability tests and is written as,…”

Section: Permeability Testing Of Cement Pastementioning

confidence: 99%

“…The simulations were verified against experimental data and numerical results published in the literature. Besides, other numerical methods are being developed to estimate the permeability of cement paste including discrete element method (DEM) (Li et al 2016a(Li et al , 2017a, finite difference method (FDM) (Sun et al 2014), tube network (Ye et al 2006;Koster et al 2006) and fractal model (Yu et al 2018a).…”

Section: Introductionmentioning

confidence: 99%

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Microstructure-Based Modeling for Water Permeability of Hydrating Cement Paste

2019

ACT

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Water permeability is a key property for the serviceability and durability of concrete structures, which governs the transport of fluid through the pore network in the cementitious material. A microstructure-based numerical test method is proposed and employed to predict the permeability of hydrating cement paste. Numerical samples characterizing the evolution of the microstructure of cement paste are generated using the computational code HYMOSTRUC3D. Based on the three-dimensional (3D) finite element method (FEM), the pore-scale flow of water induced by pressure-gradient through the sample is simulated and the corresponding permeability is estimated. Water flow characteristics in the hydrating cement paste and the evolution of the permeability against different water-to-cement ratio (w/c), porosity, curing age and degree of hydration are investigated by numerical simulations. The simulated results are verified in comparison with available theoretical solutions, experimental data and numerical predictions obtained from the literature. Due to the dilution and tortuosity effects, the permeability decreases with the increase of cement hydration and the decrease of w/c. The connectivity of the pore throat plays an important role in affecting water movement in hydrating cement paste. The developed modeling approach is capable to investigate the transport properties of cement paste, which may provide basic parameters for multiscale modeling of concrete performance and strongly support the coupled multiphysics analysis in concrete engineering.

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Section: Modeling Permeability Of Cement Pastementioning

confidence: 99%

Section: Permeability Testing Of Cement Pastementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure-Based Modeling for Water Permeability of Hydrating Cement Paste

2019

ACT

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“…In addition to some external methods (e.g., hydrophobic modification [16]), increasing the complexity of the pore structure can also reduce the permeability of cementbased materials. e understanding for permeability, from the view point of critical pore radius [17,18], porosity [18,19], pore connectivity [19], water saturation [20,21], and tortuosity [22], has caused widespread interest among researchers. e intrinsic permeability is usually measured with water and gas.…”

Section: Introductionmentioning

confidence: 99%

“…And the prior drying of gas permeability measurement may take more than one year to get a well-defined saturation [21]. As a result, methods for permeability including equations based on pore structure parameters [17,18,23], lattice Boltzmann model [21], numerical approaches [20,24], beam bending [25], and noncontact impedance measurement [26] have also been investigated. In present, permeability of ordinary Portland cement paste and cement-based materials with fly ash, silica fume, metakaolin, and rice husk ash has been studied extensively.…”

Section: Introductionmentioning

confidence: 99%

Fluid Permeability of Ground Steel Slag-Blended Composites Evaluated by Pore Structure

Yang

Jian

et al. 2020

Advances in Materials Science and Engineering

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The resource utilization of steel slag has attracted wide attention. In the present work, the pore structure of cement paste with and without ground basic oxygen furnace slag (BOFS) up to 180 days was investigated by mercury intrusion porosimetry. Permeability was evaluated from the tested pore structure. Results indicate that the porosity, critical pore radius, pore-throat radius, and permeability are increased with the BOFS content and levels off after 28 days. Lower gel porosity and higher coarse capillary porosity were observed in BOFS-blended composites. The calculated permeability (around 0.30–7.49 × 10−19 m2) based on the pore structure agrees well with the range of reported experimental measurements. Well-correlated linear and power-law relationship was noticed between permeability and porosity and characteristic pore radius, respectively.

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Modelling hydraulic and capillary‐driven two‐phase fluid flow in unsaturated concretes at the meso‐scale with a unique coupled DEM‐CFD technique

Krzaczek

Nitka

Tejchman

2022

Num Anal Meth Geomechanics

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The goal of the research was to demonstrate the impact of thin porous interfacial transition zones (ITZs) between aggregates and cement matrix on fluid flow in unsaturated concrete caused by hydraulic/capillary pressure. To demonstrate this impact, a novel coupled approach to simulate the two‐phase (water and moist air) flow of hydraulically and capillary‐driven fluid in unsaturated concrete was developed. By merging the discrete element method (DEM) with computational fluid dynamics (CFD) under isothermal settings, the process was numerically studied at the meso‐scale in two‐dimensional conditions. A flow network was used to describe fluid behaviour in a continuous domain between particles. Small concrete specimens of a simplified particle mesostructure were subjected to fully coupled hydro‐mechanical simulation tests. A simple uniaxial compression test was used to calibrate the pure DEM represented by bonded spheres, while a permeability and sorptivity test for an assembly of spheres was used to calibrate the pure CFD. For simplified specimens of the pure cement matrix, cement matrix with aggregate, and cement matrix with aggregate and ITZ of a given thickness, DEM/CFD simulations were performed sequentially. The numerical results of permeability and sorptivity were directly compared to the data found in the literature. A satisfactory agreement was achieved. Porous ITZs in concrete were found to reduce sorption by slowing the capillary‐driven fluid flow, and to speed the full saturation of pores when sufficiently high hydraulic water pressures were dominant.

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Effects of technological parameters on permeability estimation of partially saturated cement paste by a DEM approach

Cited by 15 publications

References 45 publications

Microstructure-Based Modeling for Water Permeability of Hydrating Cement Paste

Microstructure-Based Modeling for Water Permeability of Hydrating Cement Paste

Fluid Permeability of Ground Steel Slag-Blended Composites Evaluated by Pore Structure

Modelling hydraulic and capillary‐driven two‐phase fluid flow in unsaturated concretes at the meso‐scale with a unique coupled DEM‐CFD technique

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