Prediction of Stress Development and Cracking in Steel Fiber-Reinforced Self-Compacting Concrete Overlays Due to Restrained Shrinkage

ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Prediction of Stress Development and Cracking in Steel Fiber-Reinforced Self-Compacting Concrete Overlays Due to Restrained Shrinkage

Author(s): J. Carlsward and M. Emborg

Publication: Special Publication

Volume: 274

Issue:

Appears on pages(s): 31-50

Keywords: bond; cracks; overlay; restraint; SCC; shrinkage; steel fibers; theoretical model.

Date: 10/1/2010

Abstract:
Shrinkage cracking of self-compacting concrete (SCC) overlays with and without steel fibres has been assessed through laboratory testing and theoretical analysis. Test results verified that steel fibre reinforcement has a crack width limiting effect. However, the contribution in case of fibre contents up to 0.75 vol% was not found to be sufficient to distribute cracks in situations where bond to the substrate was nonexistent. Thus, even higher steel fibre contents (or other types of fibres) are required in order to control cracks. A distributed pattern of fine cracks was however obtained even for unreinforced SCC within bonded areas of the overlays. This implies that steel fibres, or other crack reinforcement, are not required if high bond strength is obtained. An analytical model, proposed to assess the risk of cracking and to predict crack widths in overlays, was found to give reasonable correlation with experimental results.