Preplaced-Aggregate Concrete

In preplaced-aggregate concrete (PAC), coarse aggregate is placed in forms, and grout is injected. This article discusses the advantages and limitations of PAC, and provides some guidelines on how to produce it. Because PAC contains less cement paste than conventional concrete, it can provide lower overall shrinkage and greater economy. PAC can also be produced using a larger maximum size coarse aggregate than conventional concrete. PAC is useful for repairs with limited access and with overhead obstructions. The repair's bond to the adjacent surfaces will be relatively high since the mass of the repair will have relatively low shrinkage. However, formwork used for PAC must be virtually watertight and able to withstand much more pressure than formwork for conventional concrete. PAC is not recommended for use in harsh environments due to its increased permeability. The quality of PAC is dependent upon proper placement of the aggregate and the complete filling of space between particles with a quality grout of proper rheology.


  • English

Media Info

  • Media Type: Print
  • Features: Figures; Photos;
  • Pagination: pp 34-38
  • Serial:
    • Concrete International
    • Volume: 27
    • Issue Number: 9
    • Publisher: American Concrete Institute (ACI)
    • ISSN: 0162-4075

Subject/Index Terms

Filing Info

  • Accession Number: 01004098
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 25 2005 5:45PM