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A bughole (or pinhole) is a small hole in the surface of a concrete structure caused by the expansion and eventual outgassing of trapped pockets of air in setting concrete.[1][2][3] Bugholes are undesirable, as they may compromise the structural integrity of concrete emplacements.

Bughole-induced outgassing is a phenomenon occurring when applying a protective coating (or lining) to concrete (predominantly vertically cast-in-place) where air becomes trapped within bughole cavities and releases into or through the protective coating, thereby causing pinholes and holidays in the coating film.[4]


  1. ^ Preventing Air-Induced Coating Failures on Concrete (PDF), JPCL, January 2007, archived from the original (PDF) on 2014-10-22, retrieved 2014-10-21
  2. ^ Solvent-Free sealant creates smooth concrete surface for coating, Bayer Coatings, retrieved 2014-10-21
  3. ^ Bugholes, Portland Cement Association, retrieved 2014-10-21
  4. ^ Thin-Patch Repair of Concrete in Wastewater Environments Using Commercially Available Cementitious Resurfacers (PDF), Concrete Repair Bulletin, January 2008, retrieved 2014-10-21[permanent dead link]