REACTION OF C SUB 3A WITH WATER

The reactions were studied of pastes of C sub 3 A (C equals Calcium; A equals Aluminum 203) without admixture, with gypsum alone, with calcium chloride alone and with a mixture of the two. The C sub 3 A without admixture initially formed C sub 4 A H sub x, which changed to C sub 3 A H sub 6. Addition of calcium chloride resulted in formation of C sub 3 A. calcium chloride. H sub 10 and C sub 4 A H sub 13 or a solid solution of the two. Chloride retarded formation of C sub 3 A H sub 6. Addition of gypsum resulted initially in formation of C sub 3 A. CSH sub 12 with a minor amount of ettringite. With both chloride and gypsum, major products were C sub 3 A. CHSH sub 12 and C and 3 A. calcium chloride H sub 10. However, more ettringite was formed in absence of chloride. Monosulfate was formed in preference to ettringite possibly because crystals of gypsum were larger than those of C sub 3 A, resulting in a slow rate of solution of the gypsum. /Author/

• Supplemental Notes:
  • Sponsored by Department of Transportation, Federal Highway Administration.
• Corporate Authors:

  United States Gypsum Company

  Department No. 119-7, 101 South Wacker Drive
  Chicago, IL  United States  60606

  United States Gypsum Company

  Chemicals Division Department 125-4, 101 South Wacker Drive
  Chicago, IL  United States  60606
• Publication Date: 1976-10

Media Info

• Pagination: p. 2
• Serial:
  • SO3 Abstracts and Newsletter
  • Volume: 13
  • Issue Number: 2
  • Publisher: United States Gypsum Company

Subject/Index Terms

• TRT Terms: Admixtures; Aluminum compounds; Calcium chloride; Calcium compounds; Chemical reactions; Ettringite; Gypsum; Pastes; Water
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00149591
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 13 1977 12:00AM