Modelling and simulations of the chemo–mechanical behaviour of leached cement-based materials

Stora, E.; Bary, Benoı̂t; He, Qi‐Chang; Deville, E.; Montarnal, Philippe

doi:10.1016/j.cemconres.2009.05.010

Cited by 63 publications

(58 citation statements)

References 40 publications

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“…The dissolution process may lead to a chemical deterioration, which destroys the microstructures of the cement. References [52][53][54] reported that pure water or ion solutions leads to leaching of calcium from cement-based materials. Calcium leaching has a strong impact on their microstructure because of the dissolution of hydrated phases, and reduces the cement strength by perforating a highly eroded microstructure.…”

Section: Discussionmentioning

confidence: 99%

Polylactic Acid Improves the Rheological Properties, and Promotes the Degradation of Sodium Carboxymethyl Cellulose-Modified Alkali-Activated Cement

et al. 2016

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Abstract:In consideration of the insolubility in water, sensitivity to heat and wide application in the oil and gas industry as a degradable additive, this paper introduces polylactic acid (PLA) to a self-degradable temporary sealing material (SDTSM) to investigate its effect on the SDTSM performance and evaluate its potential to improve the rheological properties and further promote the self-degradation of the material. The thermal degradation of PLA, the rheological properties, compressive strength, hydrated products and water absorption of SDTSMs with different PLA dosages were tested. The analysis showed that the addition of 2% PLA increased the fluidity by 13.18% and reduced the plastic viscosity by 38.04%, when compared to those of the SDTSM without PLA. PLA increased the water absorption of 200 • C-heated SDTSM and had small effect on the types but decreased the hydrate products of 85 • C-cured SDTSM, and created plenty of pores in 200 • C-heated SDTSM. PLA enhanced the self-degradation level of SDTSM by generating a large amount of pores in cement. These pores worked in two ways: one was such a large amount of pores led to a looser microstructure; the other was these pores made the water impregnate the cement more easily, and then made the dissolution of substances in the 200 • C-heated SDTSM progress faster to generate heat and to destruct the microstructure.

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Section: Discussionmentioning

confidence: 99%

Polylactic Acid Improves the Rheological Properties, and Promotes the Degradation of Sodium Carboxymethyl Cellulose-Modified Alkali-Activated Cement

et al. 2016

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“…In view of the shape of the heterogeneities, i.e. spherical or ellipsoid-like, we make the choice to apply analytical homogenization schemes based on the Eshelby theory [16]. To be more specific, to take into account different kinds of shapes with an isotropic distribution, we select the double-inclusion type model called Interaction Direct Derivative (IDD) [19].…”

Section: Micro-macro Upscalingmentioning

confidence: 99%

“…Next, the microscopic pressure effects have been upscaled to the macroscopic level via an analogy with the poroelasticity theory and the introduction of an interaction coefficient [14,15]. Analytical homogenization techniques have been applied for this purpose to estimate the mechanical homogenized properties and the interaction coefficient [16][17][18][19]. In that way, from the knowledge of the microscopic pressure we are able to determine the macroscopic mechanical response of the material.…”

Section: Introductionmentioning

confidence: 99%

Modelling of the interaction between chemical and mechanical behaviour of ion exchange resins incorporated into a cement-based matrix

Neji

Bary

Burlion

et al. 2013

EPJ Web of Conferences

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Abstract. In this paper, we present a predictive model, based on experimental data, to determine the macroscopic mechanical behavior of a material made up of ion exchange resins solidified into a CEM III cement paste. Some observations have shown that in some cases, a significant macroscopic expansion of this composite material may be expected, due to internal pressures generated in the resin. To build the model, we made the choice to break down the problem in two scale's studies. The first deals with the mechanical behavior of the different heterogeneities of the composite, i.e. the resin and the cement paste. The second upscales the information from the heterogeneities to the Representative Elementary Volume (REV) of the composite. The heterogeneities effects are taken into account in the REV by applying a homogenization method derived from the Eshelby theory combined with an interaction coefficient drawn from the poroelasticity theory. At the first scale, from the second thermodynamic law, a formulation is developed to estimate the resin microscopic swelling. The model response is illustrated on a simple example showing the impact of the calculated internal pressure, on the macroscopic strain.

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“…A specific modeling including chemistry, transport and mechanical aspects has been developed [10]. This model, implemented in the software ALLIANCES (coupling chemical, transport and mechanical codes), is able to predict in the case of leaching the degradation fronts of minerals, the evolutions of the diffusion properties of the degraded zone and its Young's modulus ( Figure 3) as a function of the mineral assemblage thanks to multiscale homogenization techniques.…”

Section: Gas Transfer In Clayey Materialsmentioning

confidence: 99%

Contribution to the French program dedicated to cementitious and clayey materials behavior in the context of Intermediate Level Waste management – Hydrogen transfer and materials durability

Bary

Bouniol

Chomat

et al. 2013

EPJ Web of Conferences

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Abstract. This article illustrates a contribution of the CEA Laboratory of Concrete and Clay Behavior ("LECBA") for the assessment and modeling of the Long-Term behavior of cementitious and clayey materials in the context of nuclear ILW (Intermediate Level Waste) management. In particular, we aim at presenting two main topics that are studied at the Lab. The first one is linked to safety aspects and concern hydrogen transfer within cementitious as well as clayey materials (host rock for French nuclear waste disposal). The second point concerns the assessment of durability properties of reinforced concrete structures in the disposal (pre-closure and post-closure) conditions. Experimental specific tests and phenomenological modelling are presented.

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Modelling and simulations of the chemo–mechanical behaviour of leached cement-based materials

Cited by 63 publications

References 40 publications

Polylactic Acid Improves the Rheological Properties, and Promotes the Degradation of Sodium Carboxymethyl Cellulose-Modified Alkali-Activated Cement

Polylactic Acid Improves the Rheological Properties, and Promotes the Degradation of Sodium Carboxymethyl Cellulose-Modified Alkali-Activated Cement

Modelling of the interaction between chemical and mechanical behaviour of ion exchange resins incorporated into a cement-based matrix

Contribution to the French program dedicated to cementitious and clayey materials behavior in the context of Intermediate Level Waste management – Hydrogen transfer and materials durability

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