CONTROLLING CONCRETE CRACKING AND CURLING

This article provides a brief explanation of why concrete shrinks and the primary problems caused by shrinkage. It then describes several projects where a shrinkage-reducing admixture (SRA) was employed to reduce the number of shrinkage cracks in exposed concrete slabs and overlays. The SRA used in these projects is a clear-liquid chemical additive. The primary active ingredient is a water-soluble polymeric glycol. The SRA was used for six high-performance applications. Results showed that the use of an SRA can effectively reduce shrinking, cracking, delaminations and curling of bonded overlays, and improve appearance in areas where cracks and joints are undesirable. Aside from a reduction of cracking, significant benefits occur in bonded overlays where drying shrinkage can disrupt the bond. An SRA, however, cannot correct poor practice nor can it compensate for poorly designed or inherently flawed mixture proportions.

Language

  • English

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 59-62
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00977972
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 27 2004 12:00AM