DETERMINING CONCRETE COMPRESSIVE STRENGTH BY LOK-TEST (PULL OUT TESTS)

PROVNING AF BETONKONSTRUKTIONERS STYRKE MED LOK-TEST

The report is concerned with an alternative concrete test method, the so-called "Lok-test", whereby the concrete strength is determined by carrying out random tests on the construction itself. The Lok-test principle is based upon the force necessary to extract a cast-in, circular steel plate from the concrete by utilizing a jacking system which exerts a vertical force relative to the surface of the concrete which is related to its strength. The investigative results show that the Lok-test method does in fact give at least as satisfactory a picture of the concrete quality as the traditional method utilizing casted test specimens. In addition, the method has the advantage of eliminating a series of other wise present drawbacks (e.g. casting and curing procedures), inasmuch as the Lok-test is carried out on the construction itself under actual conditions. /Author/

• Corporate Authors:

  Statens Vejlaboratorium

  Elisagaardsvej 5, Postbox 235
  Roskilde,   Denmark 
• Authors:
  • Jensen, O W
• Publication Date: 1976-12

Language

• Danish

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 5 p.

Subject/Index Terms

• TRT Terms: Casting; Compressive strength; Concrete; Concrete curing; Pull out test; Steel plates
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00170925
• Record Type: Publication
• Report/Paper Numbers: SV Lab. Rpt. 30
• Files: TRIS
• Created Date: May 18 1978 12:00AM