FIELD AND LABORATORY INVESTIGATIONS ON HOT MIX ASPHALT CONCRETE
RESEARCH WAS CONDUCTED TO INVESTIGATE THE BEHAVIOR OF HOT MIX ASPHALT CONCRETE UNDER THE ACTION OF WEATHERING AND TRAFFIC. THE EFFECT OF COMMERCIAL ANTI-STRIPPING AGENTS UPON THE PROPERTIES OF HOT MIX ASPHALT WILL BE EVALUATED. TWO SERIES OF TEST SECTIONS WERE PLACED IN THE FALL OF 1952. THE TEST SECTIONS, AN OUTLINE OF THE SAMPLING AND TESTING PROCEDURES, AND THE TEST RESULTS OBTAINED ON THE ORIGINAL MATERIAL AS WELL AS ON SAMPLES REMOVED FROM THE HIGHWAY SURFACE AFTER ONE, TWO, AND THREE YEARS OF SERVICE ARE DESCRIBED. THE CONTRIBUTING VARIABLES IN COMPARING THESE TWO TEST SECTIONS WERE: (1) THE AGGREGATE TYPES WERE COMPLETELY DIFFERENT, (2) THE ASPHALTS WERE BOTH AC-5'S, BUT NOT FROM THE SAME SOURCE, (3) THE CAPACITY, THE NATURE, AND THE PATTERN OF THE TRAFFIC DIFFERED GREATLY, AND (4) ALTHOUGH THE DESIGN FEATURES WERE ESSENTIALLY THE SAME, THE CONSTRUCTION PRACTICES ARE SELDOM IDENTICAL FOR TWO DIFFERENT CONTRACTORS. IT WAS DETERMINED THAT THE PRESENCE OF THE ADDITIVES DOES RETARD THE HARDENING OF THE ASPHALT, PARTICULARLY DURING THE FIRST YEAR OF SERVICE. THE ADDITIVES INCREASE THE RESISTANCE OF THE BITUMINOUS MIXTURES TO WATER ACTION. SPECIMENS COMPACTED IN THE LABORATORY AND ONE SAWED FROM THE PAVEMENT ALL SHOWED MUCH HIGHER STABILITY VALUES FOR THE LIMESTONE ASPHALT CONCRETE THAN FOR THE CHAT ASPHALT. THE RESISTANCE TO WATER ACTION AND THE WEATHERING OF THE TEST SECTIONS ARE SUMMARIZED IN THE TABLE. THE MODIFIED IMMERSION-COMPRESSION TEST APPEARS TO HAVE SOME MERIT AS A METHOD OF STUDYING STABILITY AND WATER RESISTANCE CHARACTERISTICS OF AN ASPHALT CONCRETE PAVEMENT. IT ALSO SEEMS WELL SUITED FOR A LABORATORY STUDY WHEN USED IN CONJUNCTION WITH THE ROLLER-COMPACTOR. THE ACCELERATED WEATHERING TEST, IN COMBINATION WITH THE DETERMINATION OF THE SONIC MODULUS OF ELASTICITY, SEEMS TO SHOW PROMISE AS A MEANS OF COMPARING THE RESISTANCE OF DIFFERENT TYPES OF MATERIAL TO THE EFFECTS OF EXTREME WEATHERING.
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Supplemental Notes:
- No 154, pp 1-20, 5 FIG, 11 TAB, 6 PHOT 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:
- Shupe, John W
- Taylor, Delos C
- Publication Date: 1957
Media Info
- Media Type: Digital/other
- Pagination: 20p
- Monograph Title: Performance of bituminous surfacing
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Serial:
- Highway Research Board Bulletin
- Issue Number: 154
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Accelerated weathering; Aggregates; Antistrip additives; Asphalt concrete; Asphalt hardening; Compaction; Compression tests; Construction management; Hot mix asphalt; Test procedures; Test sections; Weathering
- Uncontrolled Terms: Laboratory compaction
- Old TRIS Terms: Immersion compression test
- Subject Areas: Construction; Geotechnology; Highways; Materials; Pavements;
Filing Info
- Accession Number: 00207019
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Jul 7 1994 12:00AM