OSMOTIC STUDIES AND HYPOTHESIS CONCERNING ALKALI-AGGREGATE REACTION

AN OSMOTIC-CELL TECHNIQUE FOR STUDYING THE PHYSICAL CHEMISTRY OF THE ALKALI-AGGREGATE REACTION IS DESCRIBED. THE EXPERIMENTAL DATA ARE APPLIED TO THE DEVELOPMENT OF A HYPOTHESIS WHICH CONSIDERS THAT THE REACTION PRODUCTS OF ALKALI AND SILICA IN CONCRETE RANGE FROM A NON-EXPANSIVE HIGH-CALCIUM ALKALI-SILICA GEL TO AN ALMOST PURE ALKALI-SILICA GEL OF EXTREMELY EXPANSIVE TYPE. THE PROBABLE TYPE OF REACTION PRODUCT FORMED AND THE WAY IN WHICH IT MAY CHANGE DURING THE COURSE OF THE REACTION ARE INDICATED, WHILE FACTORS, E.G., PROPERTIES OF CEMENT PASTE, ALKALI CONCENTRATION, PARTICLE SIZE, AND AMOUNT OF AGGREGATE, INFLUENCING THE RELATIVE AVAILABILITIES OF ALKALI AND CALCIUM HYDROXIDE ARE DISCUSSED. /PCA/

• Authors:
  • Verbeck, G J
  • Gramlich, C
• Publication Date: 0

Media Info

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

Subject/Index Terms

• TRT Terms: Aggregates; Alkali aggregate reactions; Calcium; Calcium compounds; Gels; Hydroxides; Osmosis; Pastes; Physical chemistry; Silicates
• Uncontrolled Terms: Particle size distribution
• Old TRIS Terms: Calcium silicate gel
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00213506
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 57
• Files: TRIS
• Created Date: May 25 1970 12:00AM