NON-DESTRUCTIVE MEASUREMENT OF DENSITY AND MOISTURE CONTENT BY MEANS OF A NUCLEAR METER
ZERSTOERUNGSFREIE MESSUNG VON DICHTE UND WASSERGEHALT MIT EINER ISOTOPENSONDE
PREVIOUS EXPERIENCE IN THE DETERMINATION OF THE DENSITY OF COMPLETED BITUMINOUS SURFACINGS USING NUCLEAR METERS HAS SHOWN THAT THE DEVIATIONS FROM CONVENTIONALLY MEASURED DENSITY CAN HAVE VARIOUS CAUSES. THEY CAN ORIGINATE AS MUCH FROM FAULTS IN THE MEASURING PROCESS (E.G. UNSATISFACTORY SUPPORT OF THE METER, FAULTY CALIBRATION) AS FROM THE COMPOSITION AND LAYING OF THE MIX (E.G. VARYING COURSE DEPTHS, STRONGLY DIVERGING DENSITIES IN ADJOINING LAYERS, OPEN WEARING COURSE). THEREFORE THE INTRODUCTION OF THE METER FOR USE IN ACCEPTANCE TESTS, AS HAS ALREADY HAPPENED IN CERTAIN AUSTRIAN PROVINCES, APPEARS PREMATURE. FURTHERMORE MEASUREMENTS AND EVALUATION MUST FOLLOW STRICT STATISTICAL METHODS AND THE ESTABLISHMENT OF ALLOWABLE MARGINS OF ERROR NEEDS TO BE CONSIDERED. ON THE OTHER HAND THE DETERMINATION OF DENSITIES BY USE OF BACK-SCATTERING INSTRUMENTS CAN HELP TO OPTIMISE MIX DESIGN IN REGARD TO THE DEGREE OF COMPACTION AND LEAD TO THE OPTIMISATION OF THE COMPACTION PROCESS FROM THE ROLLING ASPECT INCLUDING THE NUMBER OF PASSES AND THE TEMPERATURE OF THE MIX.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/03415481
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Authors:
- TAPPERT, A
- BRUS, H
- Publication Date: 1976
Language
- German
Media Info
- Pagination: 39-52
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Serial:
- TEERBAU-VEROEFF
- Volume: 23
- ISSN: 0341-5481
Subject/Index Terms
- TRT Terms: Backscattering; Bituminous mixtures; Calibration; Compactibility; Compaction; Defects; Density; Measurement; Mix design; Moisture content; Nondestructive tests; Rollers; Temperature; Thickness
- Uncontrolled Terms: Laying
- ITRD Terms: 6160: Back scattering apparatus; 4967: Bituminous mixture; 6171: Calibration; 3686: Compaction; 5904: Compaction (state of); 5238: Defect (tech); 5908: Density; 3623: Laying; 6136: Measurement; 4714: Mix design; 5920: Moisture content; 6216: Non destructive testing; 3684: Roller; 6722: Temperature; 5933: Thickness
- Subject Areas: I31: Bituminous Binders and Materials; I52: Construction of Pavements and Surfacings;
Filing Info
- Accession Number: 01293077
- Record Type: Publication
- Source Agency: Forschungsgesellschaft für Straßen- und Verkehrswesen (FGSV)
- Files: ITRD
- Created Date: Nov 21 2010 3:50AM