EFFECTS OF DIFFERENT METHODS OF STOCKPILING AND HANDLING AGGREGATES
THE EFFECTS WERE MEASURED OF SEVERAL DIFFERENT METHODS OF STOCKPILING AND HANDLING ON AGGREGATE PROPERTIES. SIX FULL- SCALE STOCKPILES (THREE WITH CRUSHED STONE AND THREE WITH UNCRUSHED GRAVEL) WERE CONSTRUCTED TO COMPARE WITH RESULTS FROM SIMILAR STOCKPILING METHODS. SIX FIELD TEST SECTIONS OF NORTH CAROLINA STABILIZED AGGREGATE BASE COURSE (THREE WITH A SOFT AGGREGATE AND THREE WITH A HARD AGGREGATE) WERE CONSTRUCTED BY SEVERAL ROUTINE METHODS FOR HANDLING, SPREADING, AND COMPACTING AGGREGATE BASES, TO MEASURE AGGREGATE DEGRADATION. A SYSTEM WAS EMPLOYED WHEREBY EACH GRADATION IN BOTH SEGREGATION AND DEGRADATION STUDIES IS EXPRESSED IN TERMS OF A SINGLE NUMBER WHICH IS RELATED TO THE SURFACE AREA AND VOIDAGE OF AN AGGREGATE AND EXPRESSES THE RELATIVE COARSENESS OF AN AGGREGATE DEGRADATION. MATHEMATICAL ANALYSIS PROVIDED A SEGREGATION INDEX AND OBTAINED A DEGREE OF VARIATION WHICH IS AN EXPRESSION OF THE PERCENTAGE OF COMPLETE SEGREGATION. A MATHEMATICAL MODEL WAS DEVELOPED FOR PREDICTING THE STANDARD DEVIATION THAT WILL RESULT FROM SEVERAL COMBINATIONS OF VARIABLES: AGGREGATE TYPE, GRADATION, AND METHOD OF STOCKPILE CONSTRUCTION. A SYSTEM EMPLOYING ANALYSIS OF VARIOUS TECHNIQUES WAS DEVELOPED TO DETERMINE THE SIGNIFICANCE OF GRADATION CHANGES RESULTING FROM DIFFERENT TYPES OF SPREADING AND COMPACTING EQUIPMENT. SOURCES CONTRIBUTING TO OVERALL VARIABILITY WERE EXTENSIVELY INVESTIGATED AND QUANTIFIED: TESTING AIR, SAMPLING AIR, BATCH-TO-BATCH VARIANTS, WITHIN BATCH VARIANTS, AND ACTUAL OR INHERENT VARIANTS, AN EQUATION WAS ADAPTED FOR THE PURPOSE OF ESTIMATING THE TOTAL SAMPLE WEIGHT REQUIRED. THESE TESTS INDICATE THAT THE TOTAL WEIGHT OF LARGER MAXIMUM SIZE COURSE AGGREGATES FOR GRADATION TESTS SHOULD BE GREATER THAN THAT SPECIFIED BY AASHO STANDARDS IF ACCEPTABLE ACCURACY IS TO BE OBTAINED.
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Availability:
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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. No. 46, pp 1-102, 99 FIG, 24 TAB, 93 REF, 7 APP
- Publication Date: 1967
Media Info
- Media Type: Digital/other
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Serial:
- NCHRP Report
- Issue Number: 46
- Publisher: Transportation Research Board
- ISSN: 0077-5614
Subject/Index Terms
- TRT Terms: Aggregate gradation; Aggregates; Base course (Pavements); Coarse aggregates; Compaction; Crushed rock; Field tests; Gravel; Handling characteristics; Mathematical analysis; Mathematical models; Methodology; Samples; Spreading; Stabilized materials; Stockpiling; Test sections; Weight
- Uncontrolled Terms: Degradation; Handling; Segregation
- Subject Areas: Construction; Geotechnology; Highways;
Filing Info
- Accession Number: 00217584
- Record Type: Publication
- Files: TRIS, ATRI
- Created Date: May 24 1994 12:00AM