Healing or Negative Damage in Concreteby H. L. Schreyer, Univ of New Mexico, Albuquerque, NM, USA,
M. K. Neilsen, Univ of New Mexico, Albuquerque, NM, USA,
Abstract: 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: Concrete | Cracking | Strain | Deformation (mechanics) | Coupling | Hydrostatics | Compression
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