EVALUATION OF MINERAL FILLERS FOR ASPHALT PAVING MIXTURES
RIGDEN'S FRACTIONAL VOLUME VOIDS WAS USED IN THE EVALUATION OF THREE FILLERS. THE FILLER OF SPECIFIED WEIGHT (10 G) IS COMPACTED IN A SMALL CYLINDER UNDER A DEFINITE COMPARATIVE EFFORT GIVEN BY A RAMMER (350 G IN WEIGHT) FALLING FROM A FIXED HEIGHT (4 IN.) A SPECIFIED NUMBER (100) OF TIMES. AFTER COMPACTION, THE VOLUME OF VOIDS IN THE COMPACTED BULK VOLUME OF FILLER IS CALCULATED AND IS EXPRESSED AS A FRACTION OF UNIT VOLUME. THE AMOUNT OF ASPHALT IN EXCESS OF THE VOLUME OF VOIDS IN THE COMPACTED FILLER IS USED BY RIGDEN AS A MEASURE OF THE STIFFNESS OF THE FILLER-ASPHALT MIX. IN THE COMPACTION OF ASPHALT AND FILLER TO FORM A MASTIC, THE ASPHALT CONTENT IMPARTS A FLUID OR SOLID CHARACTER TO THE MIX. OBSERVATION OF THE BEHAVIOR OF A MIX OF ASPHALT WITH DIFFERENT TYPES OF FILLERS LEADS TO THE CONCEPT THAT A PORTION OF THE ASPHALT GETS FIXED UP IN THE INTER - OR INTRA-GRANULAR PORES OF THE FILLER FORMING A SOLID PHASE WITH THE FILLER, AND THE EXCESS ASPHALT, TERMED FLUID PHASE, ACTS AS A BINDER ON THE SOLID PHASE. MAXIMUM STIFFNESS RESULTS AS A PARTICULAR PROPORTION OF THE FLUID PHASE OR EXCESS ASPHALT. IF THE DEMAND FOR ADDITIONAL ASPHALT, BECAUSE OF THE INCLUSION OF THE FINE AGGREGATE, IS KEPT CONSTANT, THE COMPARISON OF THE OPTIMUM BINDER (FILLER AND ASPHALT) CONTENTS FOR MAXIMUM STRENGTH OF SHEET-ASPHALT MIXES CAN BE MADE IN TERMS OF THE OPTIMUM FLUID PHASES FOR THE FILLER-ASPHALT MASTICS ALONE.
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Supplemental Notes:
- Publication of this paper sponsored by Committee on Characteristics of Aggregates and Fillers for Bituminous Construction, 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:
- Roa, S K
- Sen, B R
- Publication Date: 1973
Media Info
- Media Type: Print
- Features: Figures; References; Tables;
- Pagination: pp 100-108
- Monograph Title: Asphalt and asphalt mix technology
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Serial:
- Highway Research Record
- Issue Number: 468
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Asphalt content; Binders; Compaction; Creep properties; Fillers (Materials); Mastic asphalt; Sheet asphalt; Stiffness; Strength of materials; Void ratios
- Old TRIS Terms: Mastics; Void
- Subject Areas: Highways; Materials;
Filing Info
- Accession Number: 00211878
- Record Type: Publication
- ISBN: 0309022541
- Files: TRIS, TRB
- Created Date: May 7 1975 12:00AM