A homogenization approach for uncertainty quantification of deflection in reinforced concrete beams considering microstructural variability

Kim, Jung J.; Fan, Tai; Taha, Mahmoud Reda

doi:10.12989/sem.2011.38.4.503

Cited by 4 publications

(3 citation statements)

References 25 publications

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“…In order to compare the simulated mineral (pore, quartz, the others) volume fraction with the real volume fraction from XRD or MIP, a concrete cube of

was simulated. The size of

was chosen because the minimum size of a REV of concrete at a mesoscale should be at least 2.5 times bigger than the maximum aggregate size (16 mm in this paper) [ 48 , 49 ]. The cube is composed of mortar and irregular aggregate with a particle size from 4 mm to 16 mm.…”

Section: Experimental Corroboration Of the Simulated 3d Microstructurementioning

confidence: 99%

3D Microstructure Simulation of Reactive Aggregate in Concrete from 2D Images as the Basis for ASR Simulation

et al. 2021

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The microstructure of alkali-reactive aggregates, especially the spatial distribution of the pore and reactive silica phase, plays a significant role in the process of the alkali silica reaction (ASR) in concrete, as it determines not only the reaction front of ASR but also the localization of the produced expansive product from where the cracking begins. However, the microstructure of the aggregate was either simplified or neglected in the current ASR simulation models. Due to the various particle sizes and heterogeneous distribution of the reactive silica in the aggregate, it is difficult to obtain a representative microstructure at a desired voxel size by using non-destructive computed tomography (CT) or focused ion beam milling combined with scanning electron microscopy (FIB-SEM). In order to fill this gap, this paper proposed a model that simulates the microstructures of the alkali-reactive aggregate based on 2D images. Five representative 3D microstructures with different pore and quartz fractions were simulated from SEM images. The simulated fraction, scattering density, as well as the autocorrelation function (ACF) of pore and quartz agreed well with the original ones. A 40×40×40 mm3 concrete cube with irregular coarse aggregates was then simulated with the aggregate assembled by the five representative microstructures. The average pore (at microscale μm) and quartz fractions of the cube matched well with the X-ray diffraction (XRD) and Mercury intrusion porosimetry (MIP) results. The simulated microstructures can be used as a basis for simulation of the chemical reaction of ASR at a microscale.

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“…In order to compare the simulated mineral (pore, quartz, the others) volume fraction with the real volume fraction from XRD or MIP, a concrete cube of

was simulated. The size of

Section: Experimental Corroboration Of the Simulated 3d Microstructurementioning

confidence: 99%

3D Microstructure Simulation of Reactive Aggregate in Concrete from 2D Images as the Basis for ASR Simulation

et al. 2021

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“…Generation the FE model includes image processing as shown in Fig. 1 and is further discussed elsewhere [8].…”

Section: Finite Element Model Of Concretementioning

confidence: 99%

“…These mechanisms are essential to accurately consider the mixed contribution of Mode I and Mode II fractures such that realistic simulation of initiation and propagation of ITZ debonding can be achieved. More details on contact and cracking models used here are discussed elsewhere [8].…”

Section: Finite Element Model Of Concretementioning

confidence: 99%

Modelling of Alkali-Silica Reaction Effects on Mechanical Property Changes of Concrete

Kim¹,

Fan²,

Tah³

et al. 2015

International Journal of Railway

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Alkali-silica reaction (ASR) is a chemical reaction in concrete that alkalis in cement react with reactive silica in aggregate in the presence of water. When ASR takes place, it produces gels that absorb water and expand. Swelling of ASR gels can damage concrete and cause cracking and volume expansion in concrete structure. In this paper, mechanical consequences of ASR on concrete are simulated by a finite element (FE) analysis. An FE model of concrete is built. The evolution of concrete mechanical properties subjected to ASR is achieved by FE analyses. The constitutive model of concrete is attained via the FE analysis. A case study is used to demonstrate the proposed method. The simulated results using the proposed model are in good agreement with the observations of concrete with ASR reported in the literature. The results can be used for a basic research to enhance durability of concrete slab tracks and concrete railway sleepers.

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ASR: Insights into the cracking process via lattice fracture simulation at mesoscale based on the chemical reactions at microscale

et al. 2023

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A homogenization approach for uncertainty quantification of deflection in reinforced concrete beams considering microstructural variability

Cited by 4 publications

References 25 publications

3D Microstructure Simulation of Reactive Aggregate in Concrete from 2D Images as the Basis for ASR Simulation

3D Microstructure Simulation of Reactive Aggregate in Concrete from 2D Images as the Basis for ASR Simulation

Modelling of Alkali-Silica Reaction Effects on Mechanical Property Changes of Concrete

ASR: Insights into the cracking process via lattice fracture simulation at mesoscale based on the chemical reactions at microscale

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