THE EFFECT OF AGGREGATE SIZE AND GRADING ON INITIAL AIR-DRYING SHRINKAGE

This report describes a series of tests in which measurements were made of the air-drying shrinkage of concrete specimens of constant mix proportions but varying aggregate grading. It was shown that the equilibrium shrinkage of specimens, of specified dimensions drying at a specified temperature and relative humidity, is independent of aggregate grading and maximum aggregate size. Specimens of relatively smaller size reached equilibrium in about a quarter of the time taken by the large specimens. It is suggested that the drying shrinkage of concrete can often be found more rapidly by testing small mortar specimens of the same water/cement and aggregate/cement ratios as the concrete. /IRRD/

• Corporate Authors:

  Cement and Concrete Association

  52 Grosvenor Gardens
  London SW1W 0AQ,   England 
• Publication Date: 1970-9

Language

• English

Media Info

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

Subject/Index Terms

• TRT Terms: Aggregate gradation; Aggregates; Concrete; Drying; Humidity; Measurement; Mix design; Shrinkage; Specimens; Temperature; Testing; Time; Water cement ratio
• Uncontrolled Terms: Aggregate size
• Old TRIS Terms: Aggregate cement ratio; Air dried
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00081781
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: TRA 449
• Files: ITRD, TRIS
• Created Date: Jul 15 1975 12:00AM