EFFECTS OF AGGREGATE SIZE, SHAPE, AND SURFACE TEXTURE, ON DURABILITY OF BITUMINOUS MIXTURES
DISCUSSION OF THE EFFECT OF AGGREGATE SIZE, SHAPE AND SURFACE TEXTURE ON THE DURABILITY OF THE BITUMINOUS MIXTURES IS BASED ON A REVIEW OF THE MAINTENANCE RECORDS OF THE VIRGINIA DEPARTMENT OF HIGHWAYS. IN THE INTEREST OF ECONOMY, EVERY EFFORT WAS MADE TO USE LOCALLY AVAILABLE AGGREGATES IN THE BITUMINOUS MIXES. HOWEVER, WITH THE EMPHASIS ON SKID RESISTENCE, IT HAS BEEN NECESSARY TO IMPORT AGGREGATES FOR THE WEARING COURSE IN SOME AREAS, BUT THE THICKNESS OF THESE COURSES HAS BEEN HELD TO THE PRACTICAL MINIMUM. THE VIRGINIA DEPARTMENT OF HIGHWAY DESIGNS PROVIDES FOR A NON- SKID WEARING SURFACE AS A PART OF THE ORIGINAL APPLICATION. THE SKID-RESISTANT SURFACES ARE LAID DOWN IN THIN APPLICATIONS OF APPROXIMATELY 30 LB. PER SQ YD., AND THEY FREQUENTLY HAVE TO BE REPLACED IN THREE TO SIX YEARS DEPENDING ON THE VOLUME OF HEAVY TRAFFIC. COARSE AGGREGATE MIXES WEAR LONGER THAN THE THIN OR FINE AGGREGATE MIX. THE DURABILITY OF SAND MIXES VARIES GREATLY, DEPENDING ON THE AGGREGATE SOURCE. IN LOCALITIES WHERE NONPOLISHING COARSE AGGREGATE IS ECONOMICALLY AVAILABLE, BITUMINOUS CONCRETE SURFACE MIXTURES ARE USED WITH A MAXIMUM-SIZE COARSE AGGREGATE. THE VERY FINE DESLICKING MIXES WEAR DOWN LESS RAPIDLY THAN DO THE LOCAL SAND MIXES, AND THE COARSE AGGREGATE MIXES GIVES THE LONGEST LENGTH OF SERVICE. HOWEVER, IT IS EMPHASIZED THAT THE DURABILITY OF ANY PARTICULAR BITUMINOUS MIXTURE IS DEPENDENT ON MANY FACTORS, SUCH AS CHARACTERISTICS OF THE AGGREGATE, MIX DESIGN, PLANT PROCEDURES, APPLICATION PROCEDURES, TEMPERATURE AND ATMOSPHERIC CONDITIONS, AND TRAFFIC TYPES AND VOLUMES. DURABILITY MAY BE SACRIFICED FOR ECONOMY AT TIMES. IT IS RECOMMENDED THAT CHANGES BE MADE IN GRADATION OF BASE MIXTURES TO PROVIDE GREATER DURABILITY. THE VIRGINIA HIGHWAY RESEARCH COUNCIL IS DEVELOPING STATISTICAL SPECIFICATIONS THAT THE DEPARTMENT HOPES TO ADOPT SOON.
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Supplemental Notes:
- 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
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Authors:
- Britton, W S G
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Conference:
- 47th Annual Meeting of the Highway Research Board
- Location: Washington District of Columbia, United States
- Date: 1968-1-15 to 1968-1-19
- Publication Date: 1970
Media Info
- Media Type: Print
- Pagination: pp 23-24
- Monograph Title: EFFECTS OF AGGREGATE SIZE, SHAPE, AND SURFACE TEXTURE ON PROPERTIES OF BITUMINOUS MIXTURES
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Serial:
- Highway Research Board Special Report
- Issue Number: 109
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Aggregate gradation; Aggregates by shape and surface texture; Asphalt concrete; Bituminous materials; Bituminous mixtures; Coarse aggregates; Durability; Grain size (Geology); Pavement performance; Physical properties; Skid resistance; Surface treating; Texture; Traffic volume; Wearing course (Pavements)
- Uncontrolled Terms: Aggregate shape; Particle size distribution
- Old TRIS Terms: Bituminous surfacing
- Subject Areas: Highways; Materials;
Filing Info
- Accession Number: 00211485
- Record Type: Publication
- Files: TRIS, TRB, ATRI
- Created Date: Jul 21 1970 12:00AM