EFFECT OF AGGREGATE ON SHRINKAGE OF CONCRETE AND HYPOTHESIS CONCERNING SHRINKAGE

A THEORETICAL FORMULA IS DERIVED FOR EFFECT OF AGGREGATE ON SHRINKAGE OF CONCRETE DURING DRYING. EXPERIMENTS DESIGNED TO TEST THE VALIDITY OF THE FORMULA ARE REPORTED. IN ADDITION TO INDICATING THE VALIDITY OF THE FORMULA, THE DATA GIVE THE FOLLOWING INDICATIONS: (1) FIRST SHRINKAGE IS GREATER THAN ANY SUBSEQUENT EXPANSION OR SHRINKAGE RESULTING FROM MOISTURE CHANGE, (2) AT A GIVEN AGGREGATE CONTENT THE SHRINKAGE IS APPROXIMATELY PROPORTIONAL TO WATER-CEMENT RATIO, (3) AFTER FIRST SHRINKAGE, SUBSEQUENT VOLUME CHANGES ARE APPROXIMATELY INDEPENDENT OF WATER-CEMENT RATIO, AND (4) THE SHAPES OF THE CURVES FOR SECOND SHRINKAGE ARE APPRECIABLY DIFFERENT FROM THOSE FOR FIRST SHRINKAGE. AN EXPLANATION OF THESE EFFECTS IS GIVEN. /PCA/

• Authors:
  • Pickett, G
• Publication Date: 0

Media Info

• Serial:
  • Portland Cement Assoc R & D Lab Bull
  • Issue Number: 0

Subject/Index Terms

• TRT Terms: Aggregates; Concrete; Drying; Mathematical analysis; Shrinkage; Theory; Volume changes; Water cement ratio
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00213515
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 66
• Files: TRIS
• Created Date: May 25 1970 12:00AM