LIGHTWEIGHT CONCRETE AGGREGATE FROM SINTERED FLY ASH

LIGHTWEIGHT CONCRETE AGGREGATE IS BEING PRODUCED COMMERCIALLY FROM PULVERIZED COAL FLY ASH BY SEVERAL PLANTS. THE PRODUCTS ARE OF GOOD QUALITY, ALTHOUGH THEY VARY SOMEWHAT WITH RESPECT TO SHAPE AND SIZE. THE TYPE OF FLY ASH USED IN THE MANUFACTURING PROCESS IS GENERALLY THAT PRODUCED FROM BITUMINOUS COAL. THE CHARACTERISTICS OF FLY ASH THAT ARE REQUIRED IN THE FORMING AND SINTERING PROCESS ARE DESCRIBED. A DESCRIPTION OF THE PHYSICAL PROPERTIES OF THE FLY ASH AGGREGATE IS PRESENTED. THE EVALUATION OF THESE AGGREGATES BY THE USE OF ASTM METHODS GIVES A GOOD INDICATION OF THE PERFORMANCE OF THE VARIOUS MATERIALS IN STRUCTURAL CONCRETE. COMPARISONS ARE PROVIDED BETWEEN OTHER TYPES OF LIGHTWEIGHT AGGREGATE CONCRETE AND, IN ALL CASES, THE FLY ASH CONCRETE SHOWS A FAVORABLE RANGE OF PROPERTIES. CONCRETE STRENGTHS IN EXCESS OF 6,000 PSI (420 KG/SQUARE CM) CAN BE PRODUCED WITH FLY ASH AGGREGATE. OF SIGNIFICANCE IN MAKING COMPARISONS IS THE HIGH RATE OF ABSORPTION OF THE AGGREGATE, THE RESIDUAL POZZOLANIC ACTIVITY, AND THE RELATIVELY LOW CEMENT FACTORS REQUIRED FOR LEAN CONCRETE. INFORMATION IS PRESENTED ON TYPICAL MIX DESIGNS FOR USE IN STRUCTURAL CONCRETE. /AUTHOR/

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrr/1970/307/307-003.pdf
• Supplemental Notes:
  • Paper sponsored by Committee on Mineral Aggregates and presented at the 49th Annual Meeting. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Minnick, L John
• Publication Date: 1970

Media Info

• Media Type: Print
• Features: Figures; Photos; References; Tables;
• Pagination: pp 21-32
• Monograph Title: Synthetic aggregates and granular materials
• Serial:
  • Highway Research Record
  • Issue Number: 307
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Absorption; Bituminous coal; Cement factor; Compressive strength; Concrete; Fly ash; Lean concrete; Lightweight aggregates; Lightweight concrete; Mix design; Physical properties; Pozzolanic action; Sintering
• Uncontrolled Terms: Concrete properties
• Old TRIS Terms: Lean mix concrete
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00217824
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Sep 21 1970 12:00AM