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Micromechanics approach for long-term stress-strain relationships of cement-matrix composites



Title: Micromechanics approach for long-term stress-strain relationships of cement-matrix composites
Author(s): Huang Hsing Pan, Yu Wen Liu, Wei-Lung Tsai
Paper category : conference
Book title: 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering
Editor(s): J. Marchand, B. Bissonnette, R. Gagné, M. Jolin and F. Paradis
Print-ISBN: 2-35158-003-6
e-ISBN: 2351580028
Publisher: RILEM Publications SARL
Publication year: 2006
Nb references: 19
Language: English


Abstract: Based on a micromechanics-based theory and Burgers’ rheological model, overall stress-strain relationships of the cement-matrix composites containing cement and fly ash/cement binders are determined for the material ages with 7 days, 14 days, 28 days, 2 months, 3 months, 6 months, 9 months, 12 months and 18 months. According to a four-parameter model, the stress-strain relation of the cement-based binder are established and simulated with respect to the material age, the strain rate and the size of the specimen. Four material parameters for two cement-based binders depending on the material age are also determined. The long-term stress-strain curves of mortars containing the volume concentrations =0.29, 0.38 and 0.49 are tested and also simulated by the inclusion method and the concept of secant moduli. The results show that the predicted stress-strain curves in the linear state are almost the same as the experimental ones, and the predicted curves in nonlinear part are slightly lower than, but close to, the experimental ones regardless of the volume concentration of inclusions and the material age. The proposed micromechanics model has the predictive power depending on the material ages for the stress-strain behaviour of a mortar that carries different from amount of aggregates.

Keywords: stress-strain, material age, micromechanics, cement-matrix composite


Online publication: 2006-08-02
Classification: 3.1 Theme 1: Numerical Models: from Microstructure to Transport Properties and Durability
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580028.039


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