Prediction of elastic properties of cement pastes at early ages

Stéfan, Lavinia; Benboudjema, Farid; Torrenti, Jean‐Michel; Bissonnette, Benoı̂t

doi:10.1016/j.commatsci.2009.11.003

Cited by 91 publications

(41 citation statements)

References 25 publications

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“…The self consistent scheme is well-suited to capture the solid percolation threshold of the REV drawn at level II [6]. However, as it was pointed out by different authors for low water-to-cement ratios, additional precautions must be taken into account to ensure the accuracy of the prediction of the solid percolation threshold [6,14,15,51]. In particular, Sanahuja et al [15] considered LD C-S-H particles as platelets (oblates) with an aspect ratio varying in function of the water-to-cement ratio.…”

Section: Localizationmentioning

confidence: 99%

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Uncertainty propagation of a multiscale poromechanics-hydration model for poroelastic properties of cement paste at early-age

Venkovic¹,

Sorelli²,

Sudret³

et al. 2013

Probabilistic Engineering Mechanics

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The durability of concrete materials with regard to early-age volume changes and cracking phenomena depends on the evolution of the poroelastic properties of cement paste. The ability of engineers to control the uncertainty of the percolation threshold and the evolution of the elastic modulus, the Biot-Willis parameter and the skeleton Biot modulus is key for minimizing the vulnerability of concrete structures at early-age. This work presents original results on the uncertainty propagation and the sensitivity analysis of a multiscale poromechanics-hydration model applied to cement pastes of water-to-cement ratio of 0.40, 0.50 and 0.60. Notably, the proposed approach provides poroelastic properties required to model the behavior of partially saturated aging cement pastes (e.g. autogenous shrinkage) and it predicts the percolation threshold and undrained elastic modulus in good agreement with experimental data. The development of a stochastic metamodel using polynomial chaos expansions allows to propagate the uncertainties of kinetic parameters of hydration, cement phase composition, elastic moduli and morphological parameters of the microstructure. The presented results show that the propagation does not magnify the uncertainty of the single poroelastic properties although, their correlation may amplify the variability of the estimates obtained from poroelastic state equations. In order to reduce the uncertainty of the percolation threshold and that of the poroelastic properties at early-age, engineers need to assess more accurately the apparent activation energy of calcium aluminate and, later on, of the elastic modulus of low density calcium-silicate-hydrate.

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Section: Localizationmentioning

confidence: 99%

“…The extension of these models to take into account the poroelastic behavior of concrete materials [1,9,10] introduced several model applications [11][12][13][14]. At early-age, the microstructure evolves due to the hydration of anhydrous cement particles and additional chemical reactions.…”

Section: Introductionmentioning

confidence: 99%

Uncertainty propagation of a multiscale poromechanics-hydration model for poroelastic properties of cement paste at early-age

Venkovic¹,

Sorelli²,

Sudret³

et al. 2013

Probabilistic Engineering Mechanics

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“…The Young's modulus of ∼ 5 GPa corresponds to the stiffness of nylon,[117] whereas the Young's modulus of ∼ 20 GPa corresponds to the stiffness of concrete. [118] Similar studies can be performed for the bending deformations of the C 60 ·TMB crystals, calculation of their shear modulus, and so forth. Another possible application of MBN Explorer could be to study the transitions between different isomeric states of the composite crystals exhibiting deformation and to investigate the phase transitions between different crystalline forms under the variation of temperature, pressure, and anisotropic forces applied to the system.…”

Section: Resultsmentioning

confidence: 99%

MesoBioNano explorer—A universal program for multiscale computer simulations of complex molecular structure and dynamics

Solov’yov¹,

Yakubovich

Nikolaev³

et al. 2012

J Comput Chem

135

236

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We present a multipurpose computer code MesoBioNano Explorer (MBN Explorer). The package allows to model molecular systems of varied level of complexity. In particular, MBN Explorer is suited to compute system's energy, to optimize molecular structure as well as to consider the molecular and random walk dynamics. MBN Explorer allows to use a broad variety of interatomic potentials, to model different molecular systems, such as atomic clusters, fullerenes, nanotubes, polypeptides, proteins, DNA, composite systems, nanofractals, and so on. A distinct feature of the program, which makes it significantly different from the existing codes, is its universality and applicability to the description of a broad range of problems involving different molecular systems. Most of the existing codes are developed for particular classes of molecular systems and do not permit multiscale approach while MBN Explorer goes beyond these drawbacks. On demand, MBN Explorer allows to group particles in the system into rigid fragments, thereby significantly reducing the number of dynamical degrees of freedom. Despite the universality, the computational efficiency of MBN Explorer is comparable (and in some cases even higher) than the computational efficiency of other software packages, making MBN Explorer a possible alternative to the available codes.

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“…As would be expected, the lower w/c mixtures require less time to achieve percolation (set), due to their reduced initial particle spacing [34]. Several recent studies have demonstrated correlation between experimental measurements of setting, such as ultrasonics and needle penetration, and various model-based measurements of solids percolation [13,14,16,17]. Thus, it is important for cement hydration and microstructural models first to provide a measure of solids percolation and then to duplicate these commonly observed influences of w/c on setting.…”

Section: Critical Observationsmentioning

confidence: 96%

“…While isothermal calorimetry monitors the rate of chemical reactions in a cementitious system, the actual hardening of the cement paste microstructure is a physical process that depends on building ''bridges'' between the reacting cement particles [12][13][14][15][16][17]. This percolation of a ''solid'' backbone across the 3-D volume of cement paste is typically assessed using a penetration test such as that described in the ASTM C 191 standard test methods for time of setting of hydraulic cement by Vicat needle [10].…”

Section: Vicat Needle Penetration-percolation Of Solidsmentioning

confidence: 99%

Critical observations for the evaluation of cement hydration models

Bentz

2010

Int J Adv Eng Sci Appl Math

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The development of computer models for cement hydration and microstructure development, with an explicit consideration of microstructure, has accelerated in the past 25 years, creating a need for a set of critical experimental observations that can be used in evaluating the model predictions. During this same time period, there have been rapid advances in experimental techniques for quantifying both the hydration rates and the produced microstructures. This paper utilizes several of these techniques to elaborate a preliminary set of experimental observations concerning the influence of water-to-cement ratio, cement particle size distribution, and curing conditions on hydration and microstructure development. Isothermal calorimetry provides a convenient measure of the ongoing hydration rates during the first 7 days of hydration, while low temperature calorimetry can be used to directly assess the percolation state of the capillary porosity and the quantity of freezable water in a hydrated cement paste. Conventional measurements of setting times, such as Vicat needle penetration, are related to the ongoing percolation transitions of the solids within the three-dimensional microstructure. Finally, since concretes in the field rarely experience saturated curing conditions, the influence of sealed curing on resultant degree of hydration and microstructure is examined. The presented data sets should provide a first step in performing a critical evaluation of existing and future computer models.

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Prediction of elastic properties of cement pastes at early ages

Cited by 91 publications

References 25 publications

Uncertainty propagation of a multiscale poromechanics-hydration model for poroelastic properties of cement paste at early-age

Uncertainty propagation of a multiscale poromechanics-hydration model for poroelastic properties of cement paste at early-age

MesoBioNano explorer—A universal program for multiscale computer simulations of complex molecular structure and dynamics

Critical observations for the evaluation of cement hydration models

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