BLENDING LIGHTWEIGHT AGGREGATES WITH NATURAL AGGREGATES FOR THE PRODUCTION OF BITUMINOUS CONCRETE
PHYSICAL PROPERTIES ARE DESCRIBED OF LIGHTWEIGHT AGGREGATES, BASIC DESIGN CRITERIA FOR THE INCLUSION OF LIGHTWEIGHT AGGREGATES IN BITUMINOUS MIXES, AND LABORATORY TEST DATA REFLECTING INDICES OF STRENGTH AND PERFORMANCE OF BITUMINOUS MIXES CONTAINING LIGHTWEIGHT AGGREGATES. PHOTOGRAPHS SHOW THE BLEB STRUCTURE (MACROSCOPIC AND MICROPSCOPIC) OF THE LIGHTWEIGHT AGGREGATE PARTICLES. PHYSICAL PROPERTIES OF LIGHTWEIGHT AGGREGATES ARE DESCRIBED WITH TEST DATA (RANGES) REGARDING UNIT WEIGHT, SPECIFIC GRAVITY, PERCENT ABSORPTION, PERCENT ABRASION, AND DEGRADATION UNDER CYCLES OF FREEZING AND THAWING. BASIC CONCEPTS FOR BITUMINOUS MIX DESIGN ARE REVIEWED AND REVISIONS ARE SUGGESTED FOR THE DESIGN OF BITUMINOUS MIXES CONTAINING BLENDS OF LIGHTWEIGHT AGGREGATES. THE PRIMARY REVISION CONSISTS OF MODIFYING THE DESIGN CRITERIA BASED ON WEIGHT MEASUREMENTS SO AS TO ACCURATELY REFLECT UNITS OF VOLUME FOR THE MIX CONSTITUENTS. A SIMPLIFIED PROCEDURE IS INCLUDED FOR THE BLENDING OF LIGHTWEIGHT AGGREGATES WITH NATURAL AGGREGATES TO SATISFY A GIVEN GRADATION SPECIFICATION. THE LABORATORY TEST DATA REPORTED CONSIST OF MARSHALL STABILITY VALUES, STABILOMETER AND COHESIOMETER VALUES, EFFECTS OF WATER ON COHESION, AND AIR PERMEABILITY OF THE COMPACTED MIX. THE RANGE OF VALUES OBTAINED FROM THESE TESTS INDICATES A HIGH LEVEL OF PERFORMANCE. /AUTHOR/
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Supplemental Notes:
- Paper sponsored by Committee on Characteristics of Aggregates and Fillers for Bituminous Construction 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:
- Hargett, E R
- Gallaway, Bob M
- Publication Date: 1969
Media Info
- Media Type: Digital/other
- Features: Figures; References; Tables;
- Pagination: pp 42-52
- Monograph Title: Bituminous materials and mixes
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Serial:
- Highway Research Record
- Issue Number: 273
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Abrasions; Absorption; Air; Bituminous mixtures; Blending; Design; Hveem cohesiometer; Hveem stabilometer; Laboratory tests; Lightweight aggregates; Marshall test; Mix design; Natural aggregates; Particles; Permeability; Physical properties; Specific gravity; Weight
- Uncontrolled Terms: Design criteria
- Old TRIS Terms: Aggregate blending; Cohesiometers; Marshall stability marshall stability & flow test flow; Stabilometers; Unit weight
- Subject Areas: Design; Highways; Materials;
Filing Info
- Accession Number: 00211435
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Sep 29 1994 12:00AM