Upscaling the elastic stiffness of foam concrete as a three-phase composite material

The stiffness of foam concrete depends primarily on the added porosity. Nevertheless, by performing 3D elastic numerical simulations on artificial unit cells in the frame of periodic homogenization, it is shown that describing foam concrete as a porous material is not sufficient to explain the exper...

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Bibliographic Details
Published in:Cement and concrete research 2018-08, Vol.110, p.13-23
Main Authors: Youssef, M. Ben, Lavergne, F., Sab, K., Miled, K., Neji, J.
Format: Article
Language:English
Subjects:
Civil Engineering
Composite materials
Computer simulation
Concrete
Engineering Sciences
Foam concrete
Homogenization
Mechanics
Mechanics of materials
Microstructure
Modulus of elasticity
Numerical simulations
Porosity
Porous materials
Sand
Stiffness
Young modulus
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Summary:The stiffness of foam concrete depends primarily on the added porosity. Nevertheless, by performing 3D elastic numerical simulations on artificial unit cells in the frame of periodic homogenization, it is shown that describing foam concrete as a porous material is not sufficient to explain the experimental measurements of the Young modulus for added porosity higher than 40%. Indeed, introducing sand as a third phase enables to recover accurate estimates of the Young modulus. Furthermore, for highly porous concrete foams, it is shown that the stress concentrates in thin members deprived of stiff sand particles, thus leading to a softer overall stiffness.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2018.04.021