INVESTIGATION OF RESISTANCE OF PRE-PLACED AGGREGATE CONCRETE TO FREEZING AND THAWING

THE OBJECTIVES OF THIS INVESTIGATION WERE: TO ESTABLISH WHETHER VARIATIONS IN MANUFACTURING PROCEDURES AFFECT THE FROST RESISTANCE OF PRE-PLACED-AGGREGATE CONCRETE, TO IDENTIFY SUCH PROCEDURES IF THEY EXIST, TO DETERMINE IF THE HARDENED CONCRETE CAN BE RENDERED MORE RESISTANT TO FREEZING AND THAWING BY THE ADDITION OF AN AIR-ENTRAINING ADMIXTURE (AEA) TO THE GROUT MIXTURE, AND TO MAKE APPROPRIATE RECOMMENDATIONS FOR MEANS BY WHICH ANY ADVERSE EFFECTS ENCOUNTERED MAY BE AVOIDED IN PRACTICE. RESULTS INDICATE THAT THE RESISTANCE OF CONVENTIONAL PREPLACED-AGGREGATE CONCRETE AFTER 28 DAYS EXPOSURE TO ACCELERATED FREEZING AND THAWING IS MUCH LESS THAN THAT OF CONCRETE CONTAINING AEA BOTH CONVENTIONALLY MIXED AND PREPLACED. THE AIR-VOID SPACING-FACTOR VALUES OF THE PREPLACED-AGGREGATE HARDENED- CONCRETE SPECIMENS CONTAINING SIMILAR AMOUNTS OF ENTRAINED AIR AS THE CONVENTIONALLY PREPARED SPECIMENS INDICATED THAT THE CONCRETE WOULD BE DURABLE. THE DURABILITY TEST DATA AGREE WITH THIS PREDICTION. /AUTHOR/

• Supplemental Notes:
  • No C-68-6, 30 PP
• Authors:
  • Tynes, W O
  • McDonald, J E
• Publication Date: 1968-9

Media Info

• Serial:
  • Waterways Exp Sta Misc Papers

Subject/Index Terms

• TRT Terms: Admixtures; Air entrained concrete; Concrete; Concrete aggregates; Concrete tests; Durability; Freeze thaw durability; Freeze thaw tests; Frost susceptibility; Manufacturing; Methodology; Void ratios
• Old TRIS Terms: Air void ratio; Frost effects
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213311
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 28 1994 12:00AM