EFFECT OF SHORT ASBESTOS FIBERS ON BASIC PHYSICAL PROPERTIES OF ASPHALT PAVEMENT MIXES

THE RESULTS OF COMPREHENSIVE LABORATORY TESTS ON ASPHALT PAVING MIXTURES WITH CHRYSOTILE ASBESTOS ARE DESCRIBED. THE MAIN EFFECT OF THE FIBER APPEARS TO BE ON PLASTIC STRENGTH AS MEASURED BY STATIC LOAD TESTS. STATIC TENSILE STRENGTH OF THE CONTROL MIX WAS INCREASED AS MUCH AS 20 TIMES AT STANDARD ASPHALT CONTENTS BY ADDING 3 PERCENT 7M FIBER. SIMILAR INCREASES IN STATIC COMPRESSION STRENGTH WERE SHOWN AT ASPHALT CONTENTS HIGHER THAN NORMAL. STATIC COMPRESSION TEST DATA SUGGEST THAT A WIDE RANGE OF FLEXIBILITY CHARACTERISTICS MIGHT BE ATTAINABLE BY ADDING ASBESTOS, AS A WIDE RANGE OF ASPHALT CONTENT APPEARS TO BE PERMITTED. SAMPLES OF ASPHALTIC CONCRETE REMOVED FROM PAVEMENT MIXES PLACED FOR SERVICE EVALUATION SUSTAINED A 510-PSI CONCENTRATED COMPRESSION LOAD FOR 1 HR AT 140 F WITHOUT FAILURE IN LABORATORY TESTS. LABORATORY TEST RESULTS ON CONTROL MIXES SUGGEST THAT USE OF A DYNAMIC TENSION (COHESION) TEST AT 140 F FOR MEASURING RESISTANCE TO PLASTIC DEFORMATION IN MIX DESIGN IS JUSTIFIED. HOWEVER, FOR PAVEMENT MIXES WITH ASBESTOS INCLUDED, DYNAMIC TESTS AT 140 F DO NOT APPEAR TO BE ADEQUATE FOR MEASUREMENT OF RESISTANCE TO PLASTIC DEFORMATION. SIGNIFICANT INCREASES IN DYNAMIC TENSILE STRENGTH AND REPEATED BLOW IMPACT STRENGTH AT 0 F WERE ALSO EVIDENT WHEN SHORT ASBESTOS FIBERS WERE INCLUDED IN PAVEMENT MIXES. THE ABILITY OF SHORT CHRYSOTILE FIBERS TO PREVENT CRACKING IN THIN FILMS OF ASPHALT-FILLER MIXES DURING ACCELERATED WEATHERING TESTS IS DESCRIBED. /AUTHOR/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrbbulletin/270/270-001.pdf
• Supplemental Notes:
  • No 270, pp 1-19, 8 FIG, 3 TAB, 5 PHOT, 7 REF, 4 APP 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
• Authors:
  • Kietzman, J H
• Publication Date: 1960

Media Info

• Media Type: Digital/other
• Pagination: 19p
• Monograph Title: Asphalt characteristics and asphaltic concrete construction
• Serial:
  • Highway Research Board Bulletin
  • Issue Number: 270
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Accelerated weathering; Asbestos; Asphalt concrete; Asphalt content; Asphalt pavements; Asphalt tests; Bituminous mixtures; Cohesion; Compressive strength; Fillers (Materials); Flexibility; Laboratory tests; Load tests; Mix design; Pavement cracking; Plasticity; Prevention; Shock resistance; Static loads; Tensile strength; Thin films
• Uncontrolled Terms: Impact strength
• Subject Areas: Highways; Materials; Security and Emergencies;

Filing Info

• Accession Number: 00210958
• Record Type: Publication
• Source Agency: Highway Research Board Bibliography
• Files: TRIS, TRB
• Created Date: Jun 3 1994 12:00AM