AN IMPROVED PROCEDURE FOR PROPORTIONING MIXES OF STRUCTURAL LIGHTWEIGHT CONCRETE

THE MIX PROPORTIONING PROCEDURES OF THE EXISTING ACI STANDARD 613A-59 WERE USED AS A BASIS FOR COMPARISON IN THE INVESTIGATION. THIS PROCEDURE UTILIZES THE CONCEPT OF THE "SPECIFIC GRAVITY FACTOR" AS THE AGGREGATE WEIGHT-TO-VOLUME RATIO. THE SPECIFIC GRAVITY FACTOR IS FOUND BY TRAIL MIX PROCEDURE. THEORETICAL ANALYSIS INDICATES THAT THIS FACTOR CAN BE MORE PRECISELY DETERMINED DIRECTLY, BY SIMPLE PYCNOMETER PROCEDURES USING THE AGGREGATE ALONE. THE VALUES OF THE SPECIFIC GRAVITY FACTORS AS OBTAINED WITH THE PYCNOMETER ARE ALMOST LINEARLY RELATED TO THE AGGREGATE MOISTURE CONTENT IN THE RANGE OF MOISTURE CONTENTS INVESTIGATED. THE TRAIL MIXES PRODUCED SATISFACTORILY CONSTANT LEVELS OF WORKABILITY, YIELD COMPRESSIVE STRENGTH, AND UNIT WEIGHTS OF THE CONRETE DESPITE WIDE VARIATIONS OF AGGREGATE MOISTURE CONTENT. /PCA/

• Authors:
  • Landgren, R
  • Hanson, J A
  • Pfeifer, D W
• Publication Date: 0

Media Info

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

Subject/Index Terms

• TRT Terms: Aggregates; Compressive strength; Instruments for measuring density; Lightweight concrete; Mix design; Moisture content; Proportioning; Specific gravity; Structural materials; Theory; Weight; Workability
• Uncontrolled Terms: Pycnometers
• Old TRIS Terms: Unit weight
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00213621
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 183
• Files: TRIS
• Created Date: Jun 1 1970 12:00AM