Healing or Negative Damage in Concrete

by H. L. Schreyer, Univ of New Mexico, Albuquerque, NM, USA,
M. K. Neilsen, Univ of New Mexico, Albuquerque, NM, USA,

Document Type: Proceeding Paper

Part of: Mechanics Computing in 1990's and Beyond


The deformation of concrete may be attributed to damage or the evolution of microcracks and to mechanical healing or the closing of microcracks. For damage, dissipation is positive but for healing the dissipation inequality is not met. Experimental data indicate that healing appears to be accompanied by permanent strains. Proposed here is a theory in which the evolution equations for healing and permanent strain are coupled so that the dissipation inequality is always satisfied. A specific formulation for hydrostatic compression is given.

Subject Headings: Cracking | Concrete | Strain | Damage (material) | Strength of materials | Deformation (mechanics) | Compression

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