Simulation of Two-Dimensional Aggregate Distribution with Wall Effect

Zheng, Jianjun; Li, C. Q.; Zhao, Lijun

doi:10.1061/(asce)0899-1561(2003)15:5(506)

Cited by 43 publications

(17 citation statements)

References 4 publications

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“…Moreover, the stable aggregate volume fraction values are approach to the area fraction of aggregate [38,39]. During this paper's scanning experiment, the conclusion is in accord with the references [37,38,39]. Accordingly, for this paper's study, it can be reasonable to consider A pc = v.…”

Section: Prediction Model Of Chloride Concentration Considering the Csupporting

confidence: 70%

“…16(b) denotes the actual volume fractions of coarse aggregate v, and the ordinate means the tested A pc values). For the aforementioned phenomenon, Zheng et al [37] numerically simulate the distribution of aggregate particles at a concrete element considering the effect of formwork walls. The simulation results show that the volume fraction of average aggregate initially increased and then asymptotically trended to a certain value as the depth from the surface to the inside of concrete element increasing.…”

Section: Prediction Model Of Chloride Concentration Considering the Cmentioning

confidence: 99%

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Prediction model of chloride diffusion in concrete considering the coupling effects of coarse aggregate and steel reinforcement exposed to marine tidal environment

Wang

Gong

2019

Construction and Building Materials

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Section: Prediction Model Of Chloride Concentration Considering the Csupporting

confidence: 70%

Section: Prediction Model Of Chloride Concentration Considering the Cmentioning

confidence: 99%

Prediction model of chloride diffusion in concrete considering the coupling effects of coarse aggregate and steel reinforcement exposed to marine tidal environment

Wang

Gong

2019

Construction and Building Materials

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“…As for aggregate gradations, this paper mainly focuses on two particular aggregate gradations, the Fuller gradation and the equal volume fraction (EVF) gradation, because they represent the lower and upper bounds on aggregate gradations. 14 If the minor and major axes of elliptical aggregate particles are denoted by D a and D b , respectively, the ratio k of D b to D a is taken as a fixed value for a given aggregate gradation to investigate the effect of aggregate shape on the ITZ area fraction. The size distribution of elliptical aggregate particles can be obtained from sieve analyses.…”

Section: Distribution Of Elliptical Aggregate Particlesmentioning

confidence: 99%

A numerical algorithm for the ITZ area fraction in concrete with elliptical aggregate particles

Zheng

Xiong

et al. 2009

Magazine of Concrete Research

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In view of the importance of the interfacial transition zone (ITZ) to the macro-properties of concrete, it is essential to determine the ITZ area fraction in concrete. Once the ITZ area fraction is known, the physicomechanical properties of concrete can be predicted based on the three-phase composite model. The intention of the present paper is to develop a numerical algorithm for the ITZ area fraction in concrete with elliptical aggregate particles. By introducing a contact function for two ellipses, the elliptical aggregate particles with various sizes are distributed within a square element with periodic boundary conditions. The Monte Carlo method is then adopted to evaluate the ITZ area fraction. After verifying the developed numerical algorithm with the analytical solution for the ITZ area fraction in concrete with circular aggregate particles, the effects of key factors that affect the ITZ area fraction are examined in a quantitative manner. It is found in the paper that the ITZ area fraction increases with the increase of the ITZ thickness, but decreases with the increase of the maximum aggregate diameter and the ratio between the major and minor axes of elliptical aggregate particles. It is also found that the aggregate gradation has a significant influence on the ITZ area fraction. The paper concludes that the numerical algorithm presented in the paper can predict the ITZ area fraction with reasonable accuracy.

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“…To evaluate these influential factors in a quantitative manner, the Fuller gradation is first adopted with sizes from 0.15 to 16 mm. Thus, h eq /h is plotted against f a in Figure 2 [ 24 , 30 ], which demonstrates that, for a small value of f a , h eq /h approaches unit and therefore ITZs seldom overlap. As f a increases, more and more ITZs overlap and h eq /h decreases.…”

Section: Equivalent Aggregate Model and Itz Thicknessmentioning

confidence: 99%

“…Second, the effect of aggregate gradation on h eq /h is analyzed. For this purpose, two typical gradations, Fuller and equal volume fraction (EVF) [ 24 , 30 ], are considered and h = 0.03 mm. Thus, h eq /h is plotted against f a in Figure 3 , indicating that, for a given f a at 0.6, 0.7, and 0.8, h eq /h for concrete with the EVF gradation is smaller than that with the Fuller one by 5.29%, 9.82%, and 20.1%, respectively.…”

Section: Equivalent Aggregate Model and Itz Thicknessmentioning

confidence: 99%

A Three-Dimensional Random Walk Algorithm for Estimating the Chloride Diffusivity of Concrete

et al. 2020

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The chloride diffusivity of concrete is an important parameter for assessing the long-term durability of coastal concrete structures. The purpose of this paper is to present a three-dimensional random walk algorithm (RWA) for estimating the chloride diffusivity of concrete. By analyzing the size distribution of aggregates, the equivalent interfacial transition zone (ITZ) thickness is derived in an analytical manner. Each aggregate is combined with the surrounding ITZ to construct an equivalent aggregate model (EAM) and the chloride diffusivity is formulated. It is found that the equivalent ITZ thickness decreases with the increase of practical ITZ thickness and aggregate volume fraction. The aggregate gradation influences the equivalent ITZ thickness to a certain extent. The relative chloride diffusivity of the equivalent aggregate is almost directly and inversely proportional to the equivalent ITZ thickness and the aggregate radius, respectively. The numerical results show that, when the EAM is adopted, the computational time is greatly reduced. With the EAM, concrete can be modeled as a two-phase material and the chloride diffusivity is estimated by applying the RWA. It is shown that, with the increase of mean square displacement and number of Brownian particles, the average chloride diffusivity of concrete approaches a stable value. Finally, through comparison with experimental data, the validation of the RWA is preliminarily verified.

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Simulation of Two-Dimensional Aggregate Distribution with Wall Effect

Cited by 43 publications

References 4 publications

Prediction model of chloride diffusion in concrete considering the coupling effects of coarse aggregate and steel reinforcement exposed to marine tidal environment

Prediction model of chloride diffusion in concrete considering the coupling effects of coarse aggregate and steel reinforcement exposed to marine tidal environment

A numerical algorithm for the ITZ area fraction in concrete with elliptical aggregate particles

A Three-Dimensional Random Walk Algorithm for Estimating the Chloride Diffusivity of Concrete

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