THE EFFECT OF SURFACE ACTIVE AGENTS AND THE RESULTING ENTRAINED AIR ON THE STRENGTH DEVELOPMENT OF PORTLAND CEMENT PASTES AND CONCRETE

RESEARCH WAS CONDUCTED TO SEPARATE THE EFFECT OF THE ENTRAINED AIR FROM POSSIBLE EFFECTS OF THE AGENT. THIS WAS ACCOMPLISHED BY EVACUATING THE AIR FROM SOME OF THE SPECIMENS. THE SCOPE OF THE PROJECT INCLUDES CONSIDERATION OF SEVERAL SURFACE-ACTIVE AGENTS (ANIONIC, CATIONIC, AND NONIONIC) AS WELL AS HYDROGEN PEROXIDE AND A COMMERCIAL AIR- ENTRAINING AGENT. A NUMBER OF DIFFERENT WATER-CEMENT RATIOS WERE USED IN THE CASE OF THE PASTES. THREE DIFFERENT AIR CONTENTS WERE CONSIDERED AND THE STRENGTH OF THE SPECIMENS WERE DETERMINED AT AGES OF 1, 7, AND 28 DAYS. SOME OF THE AGENTS WERE USED IN MORTAR AND CONCRETE SPECIMENS. THE RESULTS INDICATE THAT A LINEAR RELATIONSHIP EXISTS BETWEEN THE STRENGTH LOSS PER PERCENT AIR ENTRAINED AND THE COMPRESSIVE STRENGTH OF THE SPECIMENS. THE SLOPE OF THIS RELATIONSHIP DEPENDS, HOWEVER, ON THE ADMIXTURE, WATER-CEMENT RATIO AND THE PRESENCE OF AGGREGATE. IT IS POSTULATED THAT SOME OF THESE DIFFERENCES ARE DUE TO THE NATURE OF THE AIR VOID SYSTEM AND THE WATER REQUIRED BY THE AIR SYSTEM DURING ITS DEVELOPMENT. /CRIC/FESR/LCPC/RRL/A/

• Supplemental Notes:
  • Topic Iii-iV, REPT III/IV/3, PP 35-60, 14 FIG, 3 TAB, 6 REF
• Authors:
  • Lauer, K R
• Conference:
  • Intl Symp Admix Mortar & Concr /Belg/
• Publication Date: 1967

Subject/Index Terms

• TRT Terms: Air content; Air voids; Compressive strength; Entrained air; Hydrogen peroxide; Pastes; Portland cement; Portland cement concrete; Surface phenomena; Water cement ratio
• Old TRIS Terms: Air voids content
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00212851
• Record Type: Publication
• Source Agency: Road Research Laboratory /UK
• Files: TRIS
• Created Date: Jun 1 1970 12:00AM