MODELING OF EARLY-AGE CREEP OF SHOTCRETE. I: MODEL AND MODEL PARAMETERS

This paper revisits creep and viscous flow from the standpoint of constitutive modeling of thermo-chemo-mechanical couplings in early-age concrete. Within the framework of closed reactive porous media, creep is modeled by means of two mechanisms: a stress-induced water movement within the macropores and a relaxation mechanism in the micropores of cement gel, both of which lead to aging effects on creep and viscous flow of concrete. Regarding the first creep mechanism, aging results from chemomechanical couplings. Concerning the second mechanism, long-term aging is attributed to the relaxation of microprestresses in the micropores. Following the formulation of the model, it is shown how the material parameters can be identified from creep tests performed at different ages of loading. Finally, the model is applied to shotcrete, for which proper experimental data are missing. A companion paper, presented in this journal issue, studies the influence of creep of shotcrete on the stress redistribution in tunnels resulting from the excavation of the soil.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/07339399
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Sercombe, J
  • Hellmich, Christian
  • Ulm, F-J
  • Mang, Herbert
• Publication Date: 2000-3

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 284-291
• Serial:
  • Journal of Engineering Mechanics
  • Volume: 126
  • Issue Number: 3
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9399
  • EISSN: 1943-7889
  • Serial URL: http://ascelibrary.org/journal/jenmdt

Subject/Index Terms

• TRT Terms: Aging (Materials); Algorithms; Cement; Chemical properties; Chemical reactivity; Concrete hardening; Creep; Creep tests; Dimensionless parameters; Elasticity (Mechanics); Experiments; Fresh concrete; Gels; Hydration; Kinetics; Mathematical models; Plasticity; Prestressed concrete; Properties of materials; Shotcrete; Structural analysis; Thermodynamics; Tunnels; Viscous flow
• Identifier Terms: New Austrian Tunneling Method
• Uncontrolled Terms: Chemomechanical couplings
• Subject Areas: Bridges and other structures; Design; Highways; Materials; I25: Design of Tunnels; I32: Concrete;

Filing Info

• Accession Number: 00789012
• Record Type: Publication
• Contract Numbers: CMS-9713944, CRC 98/01 EG04, CMS-9872379
• Files: TRIS
• Created Date: Mar 26 2000 12:00AM