A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Microconcrete ageing ultrasonic identification
In this paper, a global identification of the Voigt stiffness matrix is provided for different aged microconcrete. The approach is a part of the research that develops actively the field of cement-based materials ageing assessment. It investigates the ability of the ultrasonic and laser impact tests to classify the ageing level of the altered specimen and to obtain an evaluation of elasticity coefficients. Three different specimens are tested: the first one with no degradation is used as the reference and the other two are damaged by using freeze/thaw cycles or a chemical attack. The ageing provides a heterogeneous structure, which is approximated like an equivalent weakly transversely isotropic medium in the long wave length limit hypothesis. To validate qualitatively the porosity and water content influences on the elasticity moduli, the experimental results are compared with the prediction of the Hudson's homogenized scattering medium. This model is extended to a smooth phenomenological law in the domain of high porosity. The interest of modelling a continuously altered medium is finally outlined and opens a field of investigation in the future, which accounts for the local properties of heterogeneous materials, improving the ultrasonic inspection.
Microconcrete ageing ultrasonic identification
In this paper, a global identification of the Voigt stiffness matrix is provided for different aged microconcrete. The approach is a part of the research that develops actively the field of cement-based materials ageing assessment. It investigates the ability of the ultrasonic and laser impact tests to classify the ageing level of the altered specimen and to obtain an evaluation of elasticity coefficients. Three different specimens are tested: the first one with no degradation is used as the reference and the other two are damaged by using freeze/thaw cycles or a chemical attack. The ageing provides a heterogeneous structure, which is approximated like an equivalent weakly transversely isotropic medium in the long wave length limit hypothesis. To validate qualitatively the porosity and water content influences on the elasticity moduli, the experimental results are compared with the prediction of the Hudson's homogenized scattering medium. This model is extended to a smooth phenomenological law in the domain of high porosity. The interest of modelling a continuously altered medium is finally outlined and opens a field of investigation in the future, which accounts for the local properties of heterogeneous materials, improving the ultrasonic inspection.
Microconcrete ageing ultrasonic identification
Indentifizierung der Alterung von Mikrobeton durch Ultraschall
Panet, M. (author) / Cheng, C. (author) / Deschamps, M. (author) / Poncelet, O. (author) / Audoin, B. (author)
Cement and Concrete Research ; 32 ; 1831-1838
2002
8 Seiten, 20 Quellen
Article (Journal)
English
Microconcrete ageing ultrasonic identification
| Online Contents | 2002
Identification of complex material properties of microconcrete
| British Library Conference Proceedings | 1993
Microconcrete for model drilled shaft foundations
| Online Contents | 1994
Microconcrete for model drilled shaft foundations
| Elsevier | 1994
Reinforced and prestressed microconcrete models : proceedings
| TIBKAT | 1980