Surface Roughness Criteria for Cement Paste Nanoindentation

Analysis of nanoindentation experiments assumes that the indentation occurs on a flat surface. As a result, the accuracy of nanoindentation depends on reducing the surface roughness to a tolerable level. Within the context of statistical nanoindentation techniques suitable for heterogeneous materials, this study presents a criterion for roughness of cement paste surfaces for nanoindentation, and describes a method for obtaining the desired roughness. Through a systematic experimental study, the authors show the evolution of roughness and nanomechanical properties from indentation as a function of increased polishing. They conclude that the root-mean-squared (RMS) roughness of the sample, taken over a square area with edge dimensions of 200 times the average indentation depth of the dominating phase of the material, should be less than 5 times the average indentation depth of the dominating phase of the material.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01099425
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 5 2008 12:13PM