CONTROL AND ACCEPTANCE OF AGGREGATE GRADATION BY STATISTICAL METHODS
THE PURPOSE OF THIS INVESTIGATION WAS TO DEVELOP A PROCEDURE FOR CONTROL AND ACCEPTANCE OF GRADATIONS OF AGGREGATES BY STATISTICAL METHODS. BECAUSE THE SOUTH CAROLINA STATE HIGHWAY DEPARTMENT IS MOST INTERESTED IN GRADATION OF AGGREGATES WHEN THEY ARE USED, A PROCEDURE FOR CONTROL AND ACCEPTANCE WAS DEVELOPED FOR 'AS-USED' SAMPLES. THIS PROCEDURE WAS TESTED ON 14 PROJECTS. AS REFINED, THE SYSTEM PROVIDES THAT THE SIZE OF A LOT SHALL BE THE QUANTITY REQUIRED FOR 1 MILE OF 24-FT. WIDE ROADWAY OR 100 CU YD OF STRUCTURAL CONCRETE. FIVE RANDOM SAMPLES PER LOT ARE SPECIFIED. FOR ANALYSIS OF THE DATA, THE 'STANDARDS GIVEN' CONTROL CHART TECHNIQUE IS USED. THE CENTRAL VALUE IS THE DESIRED AVERAGE OF THE GRADATION SPECIFIED. UPPER AND LOWER CONTROL LIMITS ARE ESTABLISHED USING STANDARD DEVIATIONS PREVIOUSLY DETERMINED. WHEN TEST VALUES EXCEED CONTROL LIMITS, THE DEVLIVERED PRICE FOR THE LOT WILL BE ADJUSTED. IN THIS STUDY, ANALYSIS OF VARIANCE SHOWED VARIANCE RESULTING FROM THE TESTING PROCESS SIGNIFICANT TO 98.8 PERCENT OF RESULTS ANALYZED, VARIANCE BETWEEN BATCHES IN 30 PERCENT, AND VARIANCE WITHIN BATCHES IN 56 PERCENT. A STUDY OF THE TESTING PROCESS WAS RECOMMENDED WITH A GOAL OF REDUCING THIS VARIANCE. A LIMITED SERIES TO EXPLORE THE EFFECT OF THE SIZE OF SAMPLE ON GRADATION TEST RESULTS SHOWED NO DEFINITE PREFERENCE FOR A CERTAIN SIZE SAMPLE. /AUTHOR/
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Supplemental Notes:
- Paper sponsored by Committee on Quality Assurance and Acceptance Procedures and presented at the 48th 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.
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Authors:
- Mills, William H
- Fletcher, Oren S
- Publication Date: 1969
Media Info
- Media Type: Digital/other
- Features: Figures; Tables;
- Pagination: pp 35-49
- Monograph Title: Nuclear testing, construction variability, materials control and acceptance
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Serial:
- Highway Research Record
- Issue Number: 290
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Acceptance tests; Aggregate gradation; Analysis of variance; Control devices; Randomization; Samples; Statistical analysis; Statistical quality control; Test procedures
- Subject Areas: Construction; Data and Information Technology; Highways;
Filing Info
- Accession Number: 00215223
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Dec 29 1994 12:00AM