VISCOELASTICITY OF SOLIDIFYING POROUS MATERIAL -- CONCRETE

The form of the age effect on linear creep and elasticity is established by treating the hydrating cement paste as a variable composite in which the volume fraction of solid grows while the material creeps under load. The formulation rests on three hypotheses: (1)The average strains in microelements solidified at various times are equal; (2)the properties of solidified matter (cement gel) are time-invariant; (3)the rate of migrations of solid particles causing creep in cement gel depends on the mean length of migration passages at the time of load application. The first hypothesis allows eliminating the microstresses from a system of two integral equations set up to relate stress and strain histories. A new form of the creep function is deduced, expressing the aging effect in terms of the growth of volume of cement gel and the increase of the migration passage length. It is shown that the double power law is obtained as a special case when the growth of gel volume is negligible, and a generalization consistent with growing gel volume is suggested and compared with creep data.

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

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Bazant, Z P
• Publication Date: 1977-12

Media Info

• Pagination: p. 1049-67
• Serial:
  • Journal of Engineering Mechanics
  • Volume: 103
  • Issue Number: 6
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9399
  • EISSN: 1943-7889
  • Serial URL: http://ascelibrary.org/journal/jenmdt

Subject/Index Terms

• TRT Terms: Cement; Cement paste; Concrete; Concrete curing; Creep; Elasticity (Mechanics); Gels; Hydration; Porous materials; Solidification; Viscoelasticity
• Old TRIS Terms: Aging
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00172500
• Record Type: Publication
• Source Agency: Engineering Index
• Files: TRIS
• Created Date: May 3 1978 12:00AM