STUDIES OF SOME METHODS OF AVOIDING THE EXPANSION AND PATTERN CRACKING ASSOCIATED WITH THE ALKALI-AGGREGATE REACTION

THE CHEMICAL INTERACTION OF CERTAIN SILICEOUS MINERAL CONSTITUENTS OF AGGREGATES WITH THE ALKALIES IN PORTLAND CEMENT IS KNOWN TO BE A CAUSE OF ABNORMAL EXPANSION AND PATTERN CRACKING IN SOME CONCRETE STRUCTURES. WHEN THE USE OF A REACTIVE AGGREGATE IS UNAVOIDABLE, CONTROL OF THE ALKALI CONTENT OF THE CEMENT OR THE USE OF CERTAIN PROVED POZZOLANIC MATERIALS MAY PROVIDE PROTECTION. THIS PAPER DESCRIBES METHODS FOR GAGING THE PRESENCE OF THE REACTIVE MINERALS IN THE AGGREGATES, AND DISCUSSES THE PROCEDURE FOR LIMITING THE ALKALI CONTENT OF THE CEMENT AND THE USE OF PROVED POZZOLANIC ADMIXTURES AS ALTERNATE METHODS OF MINIMIZING THE EXPANSION AND PATTERN CRACKING ASSOCIATED WITH THE ALKALI-AGGREGATE REACTION. /PCA/

• Authors:
  • Lerch, W
• Publication Date: 0

Media Info

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

Subject/Index Terms

• TRT Terms: Alkali; Alkali aggregate reactions; Concrete; Control; Cracking; Expansion; Portland cement; Pozzolan; Reactive aggregates
• Uncontrolled Terms: Concrete cracking
• Old TRIS Terms: Alkalies
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213484
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 31
• Files: TRIS
• Created Date: May 25 1970 12:00AM