Determination of Pore Structure Characteristic of Mortar Using a Steady-State Migration Test

Sugiyama, Takafumi; Shimizu, Shungo; Ritthichauy, Worapatt; Tsuji, Yukikazu

doi:10.2208/jscej.2004.767_227

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…In addition, pore structure factor was defined as continuity pore volume-tortuosity factor relation equation 7. Also, tortuosity factor determined based on previous study [Sugiyama et al 2004] [Sasaki et al 2007]. Figure 9, equation 8and equation 9shows relationship between pore structure factor and experimental factors "a" and "b" in equation 4.…”

Section: Analytical Parametermentioning

confidence: 96%

Study on Chloride Ion Penetration Model Considering Water Absorption in Concrete

Koike¹,

Yamaguchi²,

Takewaka³

et al. 2016

Sustainable Construction Materials and Technologies (SCMT)

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The aim of the study is to experimentally clarify effects of water to cement ratio and cement types on chloride ion penetration with water absorption in concrete, and to verify applicability of chloride ion penetration model considering water absorption in concrete. From the experimental result, it is found that capillary water velocity and chloride ion diffusion coefficient correlate highly with continuity pore volume due to effect of water to cement ratio and cement types. And verification result of advection-diffusion model of chloride ion based on experimental result, it is confirmed that this model could evaluate characteristics of chloride ion penetration with water absorption.

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Section: Analytical Parametermentioning

confidence: 96%

Study on Chloride Ion Penetration Model Considering Water Absorption in Concrete

Koike¹,

Yamaguchi²,

Takewaka³

et al. 2016

Sustainable Construction Materials and Technologies (SCMT)

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show abstract

“…Drift (after backfilling) 1 × 10 −3 m/s (Since the groundwater flow field after backfilling is controlled by the flow rate with the same boundary conditions, the hydraulic conductivity was set to be the same as before backfilling.) 0.15 (Since there was no reference value of porosity after backfilling, the porosity in mortar [24] was used here.) Reactions reaching equilibrium 1 The rate equation is from Lasaga (1984) [27].…”

Section: Materials Hydraulic Conductivity Porositymentioning

confidence: 99%

Improvement in pH and Total Iron Concentration of Acid Mine Drainage after Backfilling: A Case Study of an Underground Abandoned Mine in Japan

et al. 2021

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If the excavated underground veins are not backfilled, they may be a factor in the continued outflow of acid mine drainage (AMD). The flow rate of AMD can be reduced by backfilling underground drifts from abandoned mines. In addition, the quality of AMD may be improved as the flow rate of AMD reduces. In this paper, the quality of the AMD after backfilling was evaluated by a three-dimensional geochemical analysis model when the groundwater level was recovered after backfilling. The measured dissolved iron (Fe) and sulfate ion (SO42−) concentrations and pH before backfilling the drift were reproduced by the calibration of the simulation. Using the calibrated model, the pH at the outlet of the drift was changed from about pH 3 before backfilling to about pH 4 to 5 after backfilling. When calcite was contained in the filling materials of the drift, the pH approached neutral. However, when gypsum was formed, the neutralization was inhibited. The Fe concentration discharged from the drift was calculated at approximately 0.002 mol/L before backfilling. The total Fe concentration was calculated at 0.0004 mol/L or less after backfilling, and the dissolved Fe concentration decreased by several orders of magnitude after backfilling. A geochemical model quantitatively evaluated the improvement in water quality after backfilling the drifts. This method can be applied to the other abandoned mines with similar hydrogeological conditions.

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“…The fluid velocity U is changed so that the Pèclet number can be kept constant. Figure 2 shows the error norms Er 1 = x |Π − Π * | / x |Π * | and 2 at t * = 0.2. The sums are taken over the same 51 nodes in the x-direction regardless of the lattice resolution.…”

Section: The Accuracy Of the Lks For A Binary Miscible Fluid Mixturementioning

confidence: 99%

“…The problem is associated with leaching of calcium from the constituent material of concrete. In addition, recent studies (2), (3) have shown that the constituent material of concrete is changed by chemical reactions with ions that penetrate into the material from its surroundings. However, the mechanisms underlying these phenomena remain unclear.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Mass Transfer of Calcium in Concrete by the Lattice Kinetic Scheme for a Binary Miscible Fluid Mixture

Yoshino

Murayama

Matsuzaki

et al. 2009

JFST

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The lattice kinetic scheme (LKS) for a binary miscible fluid mixture was applied to the simulation of the mass transfer of calcium in concrete. Cement paste, a major component of concrete, is a porous medium with a complicated three-dimensional geometry. The structure of the model concrete was selected on the basis of experimental data obtained by high-intensity X-ray computed tomography. The LKS, an improved version of the original lattice Boltzmann method, was used to save computational memory and to maintain numerical stability. First, an unsteady convection-diffusion problem was examined, and the accuracy of the method and the error norms with various lattice resolutions were investigated. Next, the problem of the calcium current in concrete was simulated. Pressure drops in the concrete were calculated for various Reynolds numbers, and the results were compared with those of an empirical equation based on experimental data. Also, velocity fields and concentration profiles were obtained at a pore scale for a structure with inhomogeneous mass diffusivities. These simulations showed that the present method might be useful for predicting calcium leaching in concrete from the microscopic point of view.

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Determination of Pore Structure Characteristic of Mortar Using a Steady-State Migration Test

Cited by 4 publications

References 7 publications

Study on Chloride Ion Penetration Model Considering Water Absorption in Concrete

Study on Chloride Ion Penetration Model Considering Water Absorption in Concrete

Improvement in pH and Total Iron Concentration of Acid Mine Drainage after Backfilling: A Case Study of an Underground Abandoned Mine in Japan

Simulation of Mass Transfer of Calcium in Concrete by the Lattice Kinetic Scheme for a Binary Miscible Fluid Mixture

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