PETROGRAPHIC EXAMINATION OF CONCRETE AGGREGATE TO DETERMINE POTENTIAL ALKALI REACTIVITY, WITH DISCUSSION

PETROGRAPHIC EXAMINATION IS THE VISUAL AND ANALYTIC INVESTIGATIONS OF BOTH AGGREGATE LITHOLOGY AND AGGREGATE PARTICLE SIZE. THE MOST IMPORTANT ALKALI-REACTIVE ROCKS ARE LISTED AND DESCRIBED. INFLUENTIAL FACTORS OTHER THAN LITHOLOGIC COMPOSITION ARE AVAILABILITY OF THE ALKALI PRESENT IN THE AGGREGATE, ROCK TEXTURE, AND PARTICLE SIZE. THESE BECOME IMPORTANT IN JUDGEMENTS CONCERNING THE STANDARD PERMISSIBLE LIMITS ON DELETERIOUS CONTENT FOR THE VARIOUS LITHIC TYPES. DISCUSSIONS OF THE ARTICLE EMPHASIZE THE NEED FOR CONSIDERATION OF CONDITIONAL FACTORS IN CONJUNCTION WITH PETROGRAPHIC EXAMINATION. EXPANSION FOR LOWER PROPORTIONS OF CHERT AGGREGATE IS MENTIONED IN THIS CONNNECTION.

• Supplemental Notes:
  • No 18-c, pp 29-38, 2 TAB, 11 REF
• Authors:
  • Mielenz, R C
  • Mather, K
  • Brown, L S
• Publication Date: 1958

Media Info

• Serial:
  • Highway Research Board Research Reports
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Aggregates by source; Alkali aggregate reactions; Cherts; Deleterious materials; Geological surveying; Petrography; Prevention
• Uncontrolled Terms: Aggregate sources
• Old TRIS Terms: Lithography; Petrographic investigations
• Subject Areas: Highways; Materials; Security and Emergencies;

Filing Info

• Accession Number: 00214077
• Record Type: Publication
• Files: TRIS
• Created Date: May 29 1972 12:00AM