CONSTRUCTION SPECIFICATIONS FOR VOLCANIC CINDERS USED AS ROAD-SURFACING AGGREGATE

A STUDY WAS CONDUCTED TO DETERMINE PARAMETERS THAT INFLUENCE THE PERFORMANCE OF VOLCANIC CINDERS WHEN USED AS A WEARING SURFACE FOR UNPAVED FOREST ACCESS ROADS. THE SAFETY DEPLETION OF GOOD, HIGH-TYPE AGGREGATE SOURCES HAS BROUGHT ABOUT RENEWED INTEREST IN OTHER AGGREGATE TYPES, MAKING THIS STUDY PARTICULARLY TIMELY. A LITERATURE REVIEW, CORRESPONDENCE, AND PERSONAL INTERVIEWS WERE CONDUCTED TO DETERMINE EXISTING USE AND PERFORMANCE OF CINDERS. A ROAD RATING SYSTEM WAS DEVELOPED, SIMILAR TO THE AASHO ROAD TEST METHOD, TO DETERMINE WHICH WERE "GOOD ROADS" AND WHICH WERE "POOR ROADS" BASED ON A 0 TO 5 NUMERICAL RATING SCALE. THIRTY OF THE RATED ROADS AND THE CORRESPONDING CINDER PITS WERE SAMPLED AND THE MATERIAL WAS TESTED IN THE LABORATORY. THE PHYSICAL PROPERTIES OF THE CINDERS WERE THEN STATISTICALLY CORRELATED WITH THE ROAD RATING. IT WAS FOUND THAT DENSITY, GRADATION, DURABILITY, AND PLASTICITY WERE THE MOST SIGNIFICANT INDEPENDENT VARIABLES. BASED ON THESE RESULTS, SPECIFICATIONS FOR UNTREATED CINDER SURFACE COURSES HAVE BEEN DEVELOPED. THESE INCLUDE (1) A MINIMUM OF 100 PERCENT COMPACTION RELATIVE TO AASHO T 99; (2) GRADATION LIMITS OF 100 PERCENT PASSING THE 1-IN. SIEVE, 80 TO 95 PERCENT PASSING THE 3/4-IN., 35 TO 60 PERCENT PASSING THE NO. 40, AND 3 TO 12 PERCENT PASSING THE NO. 200; (3) A PLASTIC INDEX VALUE BETWEEN 2 AND 10; AND (4) A MAXIMUM LOS ANGELES ABRASION VALUE OF 50 PRIOR TO PROCESSING. IN MOST CASES THIS WILL REQUIRE CRUSHING OF THE HARDER (PURPLE, GRAY, AND BLACK) CINDERS. /AUTHOR/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1970/307/307-002.pdf
• Supplemental Notes:
  • Paper sponsored by Committee on Mineral Aggregates and presented at the 49th Annual Meeting. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Hendrickson, Larry G
  • Lund, John W
• Publication Date: 1970

Media Info

• Media Type: Print
• Features: Figures; Photos; References; Tables;
• Pagination: pp 11-20
• Monograph Title: Synthetic aggregates and granular materials
• Serial:
  • Highway Research Record
  • Issue Number: 307
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Aggregate gradation; Aggregates by source; Construction; Crushing; Density; Durability; Forest roads; Materials tests; Plasticity; Ratings; Reviews; Slag; Specifications; Surface course (Pavements); Unpaved roads; Volcanic aggregates; Wearing course (Pavements)
• Identifier Terms: Los Angeles Abrasion Test
• Uncontrolled Terms: Aggregate sources; Construction specifications
• Subject Areas: Construction; Geotechnology; Highways;

Filing Info

• Accession Number: 00217823
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Sep 21 1970 12:00AM