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Efficient Homogenization of Ageing Creep of Random Media: Application to Solidifying Cementitious Materials
The correspondence principle is widely used to estimate the effective behaviour of non-ageing linear viscoelastic composites, as it allows taking advantage of homogenization approaches originally developed in the elastic framework. However, this principle is no longer valid when the phases exhibit ageing. A recently proposedapproach overcomes this limitation: homogenization of random media can be used on composites made up of isotropic, ageing, linear, viscoelastic phases. In this paper, the latter is applied to estimate the effective viscoelastic behaviour of solidifying composite materials, that is porous materials subjected to gradual precipitation of solids into pore space. This theory developed by Bažant shows that even if the behaviour of the precipitated material is non-ageing, the effective behaviour exhibits ageing due to the microstructure evolution with time. Modelling the solidifying material as a set of fictitious ageing linear viscoelastic phases, homogenization can be taken advantage of to estimate the effective behaviour. This allows investigation of precipitation mechanisms other than the parallel arrangement initially considered by the solidification theory, such as a rough, simplified, model of cement paste. The effective ageing creep is found to be highly dependent on both the precipitation mechanism and kinetics.
Efficient Homogenization of Ageing Creep of Random Media: Application to Solidifying Cementitious Materials
The correspondence principle is widely used to estimate the effective behaviour of non-ageing linear viscoelastic composites, as it allows taking advantage of homogenization approaches originally developed in the elastic framework. However, this principle is no longer valid when the phases exhibit ageing. A recently proposedapproach overcomes this limitation: homogenization of random media can be used on composites made up of isotropic, ageing, linear, viscoelastic phases. In this paper, the latter is applied to estimate the effective viscoelastic behaviour of solidifying composite materials, that is porous materials subjected to gradual precipitation of solids into pore space. This theory developed by Bažant shows that even if the behaviour of the precipitated material is non-ageing, the effective behaviour exhibits ageing due to the microstructure evolution with time. Modelling the solidifying material as a set of fictitious ageing linear viscoelastic phases, homogenization can be taken advantage of to estimate the effective behaviour. This allows investigation of precipitation mechanisms other than the parallel arrangement initially considered by the solidification theory, such as a rough, simplified, model of cement paste. The effective ageing creep is found to be highly dependent on both the precipitation mechanism and kinetics.
Efficient Homogenization of Ageing Creep of Random Media: Application to Solidifying Cementitious Materials
Sanahuja, J. (Autor:in)
Ninth International Conference on Creep, Shrinkage, and Durability Mechanics (CONCREEP-9) ; 2013 ; Cambridge, Massachusetts, United States
23.09.2013
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Mechanical properties , Aging (material) , Creep , Kinetics , Concrete , Cement , Durability , Precipitation , Shrinkage
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