AN ASSESSMENT OF THE INFLUENCE OF MICROSTRUCTURE ON TIME-DEPENDENT DEFORMATIONS OF HARDENED CEMENT PASTE

Experimental data on drying shrinkage and creep of portland cement concrete has clearly shown that these time-dependent deformations are properties of the cement paste. Therefore, it is to be anticipated that the physical structure of the hardened paste will influence such properties. However, basic studies on the microstructure of the paste, and the properties of the hydration products constituting the paste, have often proceeded independently of creep and shrinkage measurements. This paper reviews the pertinent results in each area of research. The following conclusions are made: 1) drying shrinkage and creep are manifestations of the same phenomena; 2) both phenomena show time-dependent reversible and irreversible components; 3) c-s-h gel is primarily responsible for time-dependent deformations observed due to its randomly arranged layer structure; 4) the actual degree of ordering in c-s-h gel determines its deformational properties and is dependent on experimental parameters; 5) rates of creep and shrinkage may be controlled by different factors at different times. The various theories of creep and shrinkage that have been proposed are discussed. Drawing on these ideas and current knowledge, a modified microstructural description is suggested, and recommendations for future research are presented. (a). For the covering abstract of the conference, see IRRD abstract no.213776. /TRRL/

  • Supplemental Notes:
    • Presented at the First Australian Conference on Engineering Materials.
  • Corporate Authors:

    University of New South Wales

    School of Civil Engineering, Anzac Parade
    Kensington, New South Wales  Australia  2033
  • Authors:
    • Young, J F
  • Publication Date: 0

Media Info

  • Features: Figures; Photos; References;
  • Pagination: 26 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00129555
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Conf Paper
  • Files: ITRD, TRIS
  • Created Date: May 14 1976 12:00AM