In this contribution, a four-phase micromechanical model is proposed in order to simulate the non-linear instantaneous pre-peak response of cement concrete subjected to monotonically increasing loads. The non-linear behavior is attributed to the creation of cracks in the cement paste of the concrete; the effect of the cracks is taken into account by introducing equivalent voids in the cement paste. The concrete material is modeled as a four-phase composite with three different types of heterogeneities: gravel, sand and voids, embedded in a cement pure paste matrix. The composite homogenization is realized with the Mori-Tanaka method and the overall non-linear response of the concrete is determined by a secant approach. The proposed micromechanical model is able to capture peculiar aspects of the concrete stress-strain curve of uniaxial compression: in most concrete materials, a higher compressive strength is associated with a higher initial tangent Young's modulus. Further analogies between the theoretical curves of the proposed method and the experimental curves are shown.
Damage mechanics of cement concrete modeled as a four-phase composite
CAPORALE, Andrea;
2014-01-01
Abstract
In this contribution, a four-phase micromechanical model is proposed in order to simulate the non-linear instantaneous pre-peak response of cement concrete subjected to monotonically increasing loads. The non-linear behavior is attributed to the creation of cracks in the cement paste of the concrete; the effect of the cracks is taken into account by introducing equivalent voids in the cement paste. The concrete material is modeled as a four-phase composite with three different types of heterogeneities: gravel, sand and voids, embedded in a cement pure paste matrix. The composite homogenization is realized with the Mori-Tanaka method and the overall non-linear response of the concrete is determined by a secant approach. The proposed micromechanical model is able to capture peculiar aspects of the concrete stress-strain curve of uniaxial compression: in most concrete materials, a higher compressive strength is associated with a higher initial tangent Young's modulus. Further analogies between the theoretical curves of the proposed method and the experimental curves are shown.File | Dimensione | Formato | |
---|---|---|---|
Damage-mechanics-of-cement-concrete-modeled-as-a-_2014_Composites-Part-B--En.pdf
non disponibili
Tipologia:
Versione Editoriale (PDF)
Licenza:
Copyright dell'editore
Dimensione
468.99 kB
Formato
Adobe PDF
|
468.99 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.