PREDETERMINING THE POLISH RESISTANCE OF LIMESTONE AGGREGATES

RESEARCH DATA SHOW THAT AGGREGATE TYPE IS A VITAL FACTOR IN PAVEMENT FRICTION AND LIMESTONE AGGREGATES TEND TO POLISH MORE READILY THAN OTHER AGGREGATES. SIGNIFICANT DIFFERENCES IN POLISH SUSCEPTIBILITY EXIST AMONG LIMESTONES AND THESE DIFFERENCES ARE RELATED PRIMARILY TO THE NON-CARBONATE OR ACID INSOLUBLE CONSTITUENTS IN THE ROCK. SINCE 1946, THE VIRGINIA HIGHWAY RESEARCH COUNCIL HAS ACCUMULATED A LARGE NUMBER OF PAVEMENT FRICTION MEASUREMENTS AND INFORMATION ON AGGREGATE CHARACTERISTICS. BASED ON THESE DATA, IT APPEARS THAT A SIMPLE RELATIONSHIP EXISTS BETWEEN THE TOTAL ACID INSOLUBLE CONTENT OF VIRGINIA LIMESTONES AND THEIR POLISH RESISTANCE AS EVALUATED BY STOPPING DISTANCE NUMBERS. FROM THIS RELATIONSHIP AND OBSERVATIONS ON TRAFFIC VOLUMES, TENTATIVE GUIDELINES FOR USING LIMESTONES IN PAVEMENT SURFACES ARE PROPOSED. THIS INVOLVES USING LIMESTONES WITH INCREASINGLY HIGHER INSOLUBLE FRACTIONS IN PAVEMENT SURFACES CARRYING PROGRESSIVELY GREATER TRAFFIC VOLUMES. IT IS THOUGHT THAT CERTAIN RELATIVELY IMPURE LIMESTONES MAY BE USED IN PAVEMENTS CARRYING UP TO 10,000 VEHICLES PER DAY. IF SELECTED LIMESTONES CAN BE USED IN PAVEMENT SURFACES, CONSIDERABLE ECONOMIES WILL RESULT, BECAUSE MANY STATES ARE EITHER EXCLUDING OR CONSIDERING EXCLUSION OF ALL LIMESTONES FROM PAVEMENT SURFACES. IT IS RECOMMENDED THAT OTHER STATES CARRY OUT SIMILAR STUDIES RELATING PAVEMENT FRICTION TO LIMESTONE AGGREGATE CHARACTERISTICS, PARTICULARLY THE INSOLUBLE CONTENT. THUS THE TENTATIVE GUIDELINES SUGGESTED HERE MAY BE REFINED AND FOUND USEFUL OUTSIDE VIRGINIA. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Appendices; Figures; References; Tables;
  • Pagination: pp 1-10
  • Monograph Title: Aggregates and skid resistance of bituminous pavements
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00211608
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 8 1971 12:00AM