SOME CAUSES FOR VARIATION IN REQUIRED AMOUNT OF AIR- ENTRAINING AGENT IN PORTLAND CEMENT MORTARS

FACTORS INFLUENCING THE AMOUNT OF ADMIXTURE REQUIRED FOR AIR ENTRAINMENT IN MORTARS WERE INVESTIGATED. IT IS SHOWN THAT AIR-ENTRAINING AGENT REQUIREMENT INCREASES AS THE SPECIFIC SURFACE OF THE CEMENT INCREASES. HIGH ALKALI CEMENTS REQUIRE SMALLER AMOUNTS OF ALL ADMIXTURES TO OBTAIN A PARTICULAR AIR CONTENT THAN DO LOW ALKALI CEMENTS. ORGANIC IMPURITIES CAN EITHER DECREASE OR INCREASE THE AIR- ENTRAINING AGENT REQUIREMENT DEPENDING UPON THE KIND AND CONDITION OF IMPURITY. IN SOME CASES, AN ORGANIC IMPURITY CAN BE AS EFFECTIVE IN ENTRAINING AIR AS AN ADMIXTURE. SOME DISCUSSION OF AIR ENTRAINING AGENTS IS INCLUDED AS WELL AS DATA INDICATING THAT DIVERGENT TYPES OF AGENTS ACT SIMILARLY. /PCA/

• Authors:
  • Greening, N R
• Publication Date: 0

Media Info

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

Subject/Index Terms

• TRT Terms: Air content; Air entraining agents; Alkali; Mortar; Portland cement; Specific surface
• Old TRIS Terms: Alkalies
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213646
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 213
• Files: TRIS
• Created Date: Jun 1 1970 12:00AM