CHEMICAL AND PHYSICAL REACTIONS OF CARBONATE AGGREGATES IN CONCRETE

SLIDES ARE SHOWN OF REACTIVE ROCK LOCATIONS IN VIRGINIA. THE CARBONATE AGGREGATE SOURCES IN VIRGINIA WERE SAMPLED TO DEVELOP OR EVALUATE TESTING PROCEDURES TO EVALUATE SPECIFIC MATERIALS AND UNDERSTAND THE MECHANISM OF THE REACTION. PRELIMINARY SAMPLING OF CARBONATE QUARRIES WERE CONDUCTED WITH THE ROCK PRISM TEST, CHEMICAL ANALYSES, AND PETROGRAPHIC EXAMINATION. AGGREGATES WERE STUDIED MINERALOGICALLY AS WELL AS IN ROCK PRISMS, MORTAR BARS, AND CONCRETE BEAMS. AGGREGATE EXPANSION IN SOME TYPICAL ROCK PRISM EXPANSIONS ARE SHOWN ON SLIDES. THE EXPANSION SHOWN IS NOT THE ABSOLUTE EXPANSION, BUT THE DIFFERENCE BETWEEN THAT CONTAINING THE EXPANSIVE AGGREGATE AND A CORRESPONDING CONCRETE CONTAINING A NON-EXPANSIVE GRANITE. THE STUDY INDICATES THAT THE REACTION IS RELATED TO THE AMOUNT OF THE REACTIVE MATERIAL IN THE CONCRETE. DATA ARE PRESENTED RELATING THE AVERAGE EXPANSION OF THREE CONCRETE BEAMS MADE WITH HIGH ALKALI CEMENT TO THE AVERAGE EXPANSION OF SIX PRISMS MADE FROM PIECES RANDOMLY SELECTED FORM THE SAMPLE.

• Supplemental Notes:
  • pp 140-155, 12 FIG, 17 REF
• Authors:
  • Newlon, H H
• Conference:
  • Highway Geology Symposium, Iowa State U
• Publication Date: 1968-7

Subject/Index Terms

• TRT Terms: Aggregates by source; Carbonates; Chemical reactions; Concrete aggregates; Expansion; Petrography; Prisms; Reactive aggregates; Test procedures
• Uncontrolled Terms: Aggregate sources
• Old TRIS Terms: Physical tests
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00213346
• Record Type: Publication
• Report/Paper Numbers: pp 128-129
• Files: TRIS
• Created Date: Jul 7 1994 12:00AM