SOME EXPERIMENTS ON CONCRETE CUBES WITH NON-PLANE SURFACES

AFTER THE RETURN OF SOME CUBE MOULDS FROM SITE EARLY IN 1965 AND THEIR ABSORPTION INTO THE GENERAL LABORATORY STOCK OF MOULDS, EXCESSIVE VARIATIONS WERE FOUND IN THE STRENGTH OF SOME SPECIMENS MADE FROM CAREFULLY CONTROLLED CONCRETE MIXES. AT THE SAME TIME CUBES COMING INTO THE LABORATORY FOR TESTING SHOWED SURFACES THAT WERE EXCESSIVELY CONVEX AND IT WAS FOUND THAT SOME OF THE CUBE MOULDS BEING RETURNED FROM SITE WERE VERY WORN AND HAD SURFACES WHICH VARIED FROM PLANE BY UP TO 0.025 IN. SEVERAL CUBE MOULDS WERE EXAMINED AND MEASUREMENTS TAKEN TO SELECT THOSE WITH SURFACE VARIATIONS BETWEEN 0.001 AND 0.015 IN. FROM PLANE. CUBES WERE CAST IN THESE MOULDS AND, AFTER CURING FOR 7 AND 28 DAYS, MEASURED FOR SURFACE PLANENESS AND TESTED FOR COMPRESSIVE STRENGTH. THE RESULTS INDICATE THAT A 0.010 IN. TOTAL VARIATION FROM THE PLANE IN THE SURFACES OF A CONCRETE CUBE CAN CAUSE A REDUCTION IN COMPRESSIVE STRENGTH OF UP TO 15 PERCENT. /RRL/A/

• Supplemental Notes:
  • Vol 18, No 54, PP 35-37, 1 FIG, 2 REF
• Authors:
  • Westley, J W
• Publication Date: 1966-3

Media Info

• Serial:
  • Magazine Concrete Research /UK/

Subject/Index Terms

• TRT Terms: Compression tests; Compressive strength; Concrete; Cubes; Deformation; Forming; Laboratory tests; Surfaces
• Old TRIS Terms: Compressive strength tests; Molds (Forming); Plane deformation
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00212240
• Record Type: Publication
• Source Agency: Road Research Laboratory /UK
• Files: TRIS
• Created Date: Feb 15 1994 12:00AM