THE PROPERTIES AND RECOGNITION OF DELETERIOUS CHERTS

THE PROPERTIES OF SELECTED OHIO CHERTS WERE STUDIED BY MEANS OF PETROGRAPHIC AND ELECTRON MICROSCOPES, CHEMICAL ANALYSIS, DIFFERENTIAL THERMAL ANALYSES, X-RAY ANALYSES FOR TRACE ELEMENTS, THERMAL CHOCK, AND PORE SIZE ANALYSIS, AND THESE WERE CORRELATED WITH MORE CONVENTIONAL AGGREGATE AND CONCRETE TESTS SUCH AS COMPRESSIVE STRENGTH, FREEZE-THAW DURABILITY, ALKALI AGGREGATE EXPANSION, SODIUM SULFATE SOUNDNESS, SPECIFIC GRAVITY AND ABSORPTION TESTS. EACH OTHER PROPERTY BY MEANS OF A SPECIAL LINEAR CORRELATION ANALYSIS TECHNIQUE. AMONG THE MORE IMPORTANT CONCLUSIONS WERE: (1) THE SODIUM SULFATE SOUNDNESS AND THE EFFECTIVE POROSITY TESTS ARE THE MOST ECONOMICAL AND EFFECTIVE WAYS OF DETERMINING THE FROST SUSCEPTIBILITY OF AN AGGREGATE, (2) SPECIFIC GRAVITY ALONE IS NOT AN INDICATOR OF THE AGGREGATES DURABILITY, (3) INCREASING THE CHERT CONTENT (1%, 10%, 20%) DOES NOT ALWAYS DECREASE THE FREEZE-THAW DURABILITY OF CONCRETE, AND (4) THREE MAJOR ALKALI-AGGREGATE REACTIONS CAUSE THE EXPANSION IN THE MORTAR BARS; NAMELY, SILICA- CARBONATE AND CLAY-ALKALI REACTIVITY. /BPR/

• Corporate Authors:

  University of Toledo

  Toledo, OH  United States  43606

  Ohio Department of Highways

  Columbus, OH  United States  43210

  Bureau of Public Roads /US

  400 7th Street, SW
  Washington, DC  United States  20590
• Authors:
  • Kneller, W A
  • Kriege, H F
  • Saxer, E L
  • Wilband, J T
  • Rohrbacher, T J
• Publication Date: 1968-11

Subject/Index Terms

• TRT Terms: Absorptivity; Alkali aggregate reactions; Chemical analysis; Cherts; Compressive strength; Correlation analysis; Deleterious materials; Differential thermal analysis; Electron microscopes; Freeze thaw durability; Geological surveying; Measurement; Perception; Petrography; Porosity; Properties of materials; Sodium sulfate test; Specific gravity; X ray analysis
• Old TRIS Terms: Petrographic investigations; Recognition; Specific gravity tests
• Subject Areas: Data and Information Technology; Geotechnology; Highways; Materials; Safety and Human Factors;

Filing Info

• Accession Number: 00217491
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Files: TRIS
• Created Date: Apr 20 1970 12:00AM