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Viscoelastic stress modeling in cementitious materials using constant viscoelastic hydration modulus

Hansen, W. ; Liu, Z. ; Koenders, E. A. B. (2014)
Viscoelastic stress modeling in cementitious materials using constant viscoelastic hydration modulus.
1st Ageing of Materials & Structures Conference. Delft, The Netherlands (26.05.2014-28.05.2014)
Konferenzveröffentlichung, Bibliographie

Kurzbeschreibung (Abstract)

Viscoelastic stress modeling in ageing cementitious materials is of major importance in high performance concrete of low water cement ratio (e.g. w/c ~0.35) where crack resistance due to deformation restraint needs to be determined. Total stress analysis is complicated by the occurrence of internal stresses due to shrinkage, which requires estimating the stress relaxation effect from tensile creep. This study presents a new and direct methodology for viscoelastic stress analysis based on measurement of the viscoelastic hydration modulus. Autogenous shrinkage, if restrained, creates an internal tensile stress condition which is uniform within a cross section. Autogenous shrinkage stresses develop within the porous hydration products. They are compressive stresses and if restrained by reinforcement a net tensile stress develops. Results show that the viscoelastic hydration modulus is approximately 8000-9000 MPa and is a constant material property. Total stress analysis can now be separated into two components, an elastic stress based on the Young’s modulus (typically in the range of 28000-34000 MPa) and a viscoelastic (time-dependent) stress based on measurement of timedependent strains (creep and shrinkage). The importance of reducing paste content for shrinkage stress control is demonstrated using the Pickett’s model.

Typ des Eintrags: Konferenzveröffentlichung
Erschienen: 2014
Autor(en): Hansen, W. ; Liu, Z. ; Koenders, E. A. B.
Art des Eintrags: Bibliographie
Titel: Viscoelastic stress modeling in cementitious materials using constant viscoelastic hydration modulus
Sprache: Englisch
Publikationsjahr: Mai 2014
Verlag: DCMat Ageing Centre, Delft University of Technology
Veranstaltungstitel: 1st Ageing of Materials & Structures Conference
Veranstaltungsort: Delft, The Netherlands
Veranstaltungsdatum: 26.05.2014-28.05.2014
URL / URN: http://resolver.tudelft.nl/uuid:6f2fe376-15f1-423b-b8a1-9699...
Kurzbeschreibung (Abstract):

Viscoelastic stress modeling in ageing cementitious materials is of major importance in high performance concrete of low water cement ratio (e.g. w/c ~0.35) where crack resistance due to deformation restraint needs to be determined. Total stress analysis is complicated by the occurrence of internal stresses due to shrinkage, which requires estimating the stress relaxation effect from tensile creep. This study presents a new and direct methodology for viscoelastic stress analysis based on measurement of the viscoelastic hydration modulus. Autogenous shrinkage, if restrained, creates an internal tensile stress condition which is uniform within a cross section. Autogenous shrinkage stresses develop within the porous hydration products. They are compressive stresses and if restrained by reinforcement a net tensile stress develops. Results show that the viscoelastic hydration modulus is approximately 8000-9000 MPa and is a constant material property. Total stress analysis can now be separated into two components, an elastic stress based on the Young’s modulus (typically in the range of 28000-34000 MPa) and a viscoelastic (time-dependent) stress based on measurement of timedependent strains (creep and shrinkage). The importance of reducing paste content for shrinkage stress control is demonstrated using the Pickett’s model.

Freie Schlagworte: autogenous shrinkage, High Performance Concrete (HPC), modeling viscoelastic effects, shrinkage stresses
Fachbereich(e)/-gebiet(e): 13 Fachbereich Bau- und Umweltingenieurwissenschaften
13 Fachbereich Bau- und Umweltingenieurwissenschaften > Institut für Werkstoffe im Bauwesen
Hinterlegungsdatum: 04 Jun 2015 08:44
Letzte Änderung: 01 Jun 2016 07:18
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