Found most often on hard-troweled aggregate surfaces in the Northern Great Plains, these small popouts are unusual in that they often appear within a few hours after concrete is finished. Research has been performed to determine the cause of these popouts and to seek methods to prevent them. After petrographic examinations of these popouts confirmed the presence of alkali-silica reactivity (ASR), research was set out to find the factors that most contribute to popout formation. This paper reviews a laboratory study that was undertaken to investigate several variables, including cement content, finishing technique, air entrainment, and curing procedure. Some of the recommended procedures that offer the best protection against the formation of popouts include: wet curing, as early as possible, particularly in the hot summer months; protecting fresh concrete from drying before final finishing; and avoiding hard troweling if possible.


  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 2-4
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00962947
  • Record Type: Publication
  • Report/Paper Numbers: CT022
  • Files: TRIS
  • Created Date: Sep 4 2003 12:00AM