A multiscale model for effective moduli of concrete incorporating ITZ water–cement ratio gradients, aggregate size distributions, and entrapped voids

Nadeau, J. C.

doi:10.1016/s0008-8846(02)00931-6

Cited by 77 publications

(34 citation statements)

References 22 publications

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“…16] extends the three-phase model of Christensen & Lo [60]. It has been used by Nadeau [5] to upscale the elastic properties of mortars with an ITZ.…”

Section: N + 1-phase Spherical Model To Account For the Interfacial Tmentioning

confidence: 99%

“…The 3D numerical homogenization procedure for viscoelastic microstructures proposed by Šmilauer and Bažant [4] is used to compute the time-dependent response to a constant applied load. The Interface Transition Zone is described, the model of Nadeau [5] is recalled and the assumption to extend it to viscoelasticity is exposed. Then, the obtained results are compared to the predictions of mean-field homogenization.…”

Section: Introductionmentioning

confidence: 99%

“…For the 2D finite element computations of Grondin [50], an effective mixed interphase around each aggregate is formed by the ITZ and by a volume fraction of the bulk cement paste. Micromechanics methods may also take account of the ITZ as an effective layer surrounding inclusions [5,49] or as an imperfect bonding between inclusions and matrix [51].…”

Section: Introducing An Interfacial Transition Zonementioning

confidence: 99%

“…To perform realistic homogenization computation, a 4 mm-wide sample of a mortar was considered, so that 10 μm details such as an ITZ can be pictured. The model of Nadeau [5] described Fig. 11.…”

Section: Introducing An Interfacial Transition Zonementioning

confidence: 99%

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Investigation of the effect of aggregates' morphology on concrete creep properties by numerical simulations

Lavergne

Sab

Sanahuja

et al. 2015

Cement and Concrete Research

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International audiencePrestress losses due to creep of concrete is a matter of interest for long-term operations of nuclear power plants containment buildings. Experimental studies by Granger (1995) have shown that concretes with similar formulations have different creep behaviors. The aim of this paper is to numerically investigate the effect of size distribution and shape of elastic inclusions on the long-term creep of concrete. Several microstructures with prescribed size distribution and spherical or polyhedral shape of inclusions are generated. By using the 3D numerical homogenization procedure for viscoelastic microstructures proposed by Šmilauer and Bažant (2010), it is shown that the size distribution and shape of inclusions have no measurable influence on the overall creep behavior. Moreover, a mean-field estimate provides close predictions. An Interfacial Transition Zone was introduced according to the model of Nadeau (2003). It is shown that this feature of concrete's microstructure can explain differences between creep behaviors

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“…16] extends the three-phase model of Christensen & Lo [60]. It has been used by Nadeau [5] to upscale the elastic properties of mortars with an ITZ.…”

Section: N + 1-phase Spherical Model To Account For the Interfacial Tmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introducing An Interfacial Transition Zonementioning

confidence: 99%

Section: Introducing An Interfacial Transition Zonementioning

confidence: 99%

See 2 more Smart Citations

Investigation of the effect of aggregates' morphology on concrete creep properties by numerical simulations

Lavergne

Sab

Sanahuja

et al. 2015

Cement and Concrete Research

View full text Add to dashboard Cite

show abstract

“…pre-placing aggregate concrete, Roller-compacted concrete, and some concrete with low cement content (Neville 1981;Ping and Beaudoin 1992;Nadeau 2003). Unfortunately, those processes typically can only prepare low or middle strength concrete (Neville 1981), the result of Fig.…”

Section: The Mechanism Of the Coarse Aggregate Interlocking Concretementioning

confidence: 99%

Low Carbon Concrete Prepared with Scattering-Filling Coarse Aggregate Process

Zhang

Shi

et al. 2014

Int J Concr Struct Mater

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The volume fraction of the coarse aggregate in the conventional plastic concrete is controlled relatively low to ensure a required workability. In this paper, a new type of coarse aggregate interlocking concrete with strength ranging from C30 to C80 was prepared with scattering-filling aggregate process. The strength of concrete prepared with this method increases obviously whereas the shrinkage decreases significantly, the cement dosage in the concrete decreased 20 % at the same time. The microhardness of the ITZ between the cement paste and scattering-filling aggregate is higher than that of the original aggregate, the ITZ become narrower and tighter also. The interlocking and more even distribution of the coarse aggregate and the water absorption of the addition of extra amount of coarse aggregates contribute to the strength and performance improvement of the concrete prepared with scattering-filling aggregate process.

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Analytical prediction of aggregates' effects on the ITZ volume fraction and Young's modulus of concrete

Zouaoui

Miled

Limam

et al. 2016

Num Anal Meth Geomechanics

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Summary In order to evaluate analytically the ITZ volume fraction (fITZ) in concrete, a three phase model is proposed for the random concrete microstructure using the Voronoï tessellation. Within this model, the ITZ local thickness is a statistical variable depending on the local paste thickness available between each couple of neighbouring aggregates. The fITZ is found to not exceed 7% for typical concretes. Then, the concrete Young's modulus is predicted analytically using a four‐phase generalized self consistent model but in which the proposed fITZ is considered. It is found that the concrete Young's modulus increases when increasing aggregates volume fraction, aggregates maximum size and the proportion of coarse aggregates and when decreasing the ITZ thickness and Young's modulus. Finally, the validity of the proposed model is discussed based on a comparison between its predictions and three sets of experimental results related to normal and high strength concretes taken from literature. Copyright © 2016 John Wiley & Sons, Ltd.

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A multiscale model for effective moduli of concrete incorporating ITZ water–cement ratio gradients, aggregate size distributions, and entrapped voids

Cited by 77 publications

References 22 publications

Investigation of the effect of aggregates' morphology on concrete creep properties by numerical simulations

Investigation of the effect of aggregates' morphology on concrete creep properties by numerical simulations

Low Carbon Concrete Prepared with Scattering-Filling Coarse Aggregate Process

Analytical prediction of aggregates' effects on the ITZ volume fraction and Young's modulus of concrete

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