TOBERMORITE GEL-THE HEART OF CONCRETE

TRICALCIUM SILICATE, AND BETA DICALCIUM SILICATE CONSTITUTE ABOUT 75 PERCENT OF A PORTLAND CEMENT BY WEIGHT. IN THE HYDRATION REACTION, THE TWO SILICATES PRODUCE SIMILAR CALCIUM SILICATE HYDRATES AND DIFFERENT AMOUNTS OF CALCIUM HYDROXIDE. THE CALCIUM SILICATE HYDRATE, TOBERMORITE GEL, PLAYS A VITAL ROLE IN DETERMINING THE RHEOLOGICAL PROPERTIES OF FRESH PORTLAND CEMENT PASTE AND WORKABILITY OF FRESH CONCRETE. IT DETERMINES THE SETTING AND HARDENING RATES OF THE PASTE, AND THE STRENGTH AND DIMENSIONAL STABILITY OF THE CONCRETE. THE CHEMICAL AND PHYSICAL CHARACTERISTICS OF TOBERMORITE GEL ARE DESCRIBED AND THE MECHANISMS OF STRENGTH DEVELOPMENT AND SHRINKING AND SWELLING OF CEMENT PASTES ARE DISCUSSED. EXCELLENT ELECTRON MICROGRAPHS ARE PRESENTED. /PCA/

• Authors:
  • Brunauer, S
• Publication Date: 0

Media Info

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

Subject/Index Terms

• TRT Terms: Calcium compounds; Concrete; Concrete curing; Concrete hardening; Consistency; Gels; Hardness; Hydrates; Hydration; Hydroxides; Pastes; Portland cement; Rheology; Silicates; Tobermorite
• Old TRIS Terms: Concrete consistency
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213578
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 138
• Files: TRIS
• Created Date: Jun 1 1970 12:00AM