SERVICE RECORD STUDY OF BITUMINOUS CONCRETE AND SAND ASPHALT PAVEMENTS IN NORTH CAROLINA

SEVERAL TEST SECTIONS OF SPECIALLY DESIGNED HIGH-TYPE BITUMINOUS-CONCRETE PAVING MIXTURES WERE OBSERVED. ALL MIXTURES HAVE BEEN USED AS AN OVERLAY OVER OLD PORTLAND CEMENT CONCRETE PAVEMENT. THE IMPORTANT FACTORS ARE: (1) PROPER DESIGN AND FIELD CONTROL OF THE MIXTURE, (2) BEHAVIOR OF THREE TYPES OF COMMERCIAL AGGREGATES UNDER SEVERE SERVICE CONDITIONS, (3) TACK COATS, (4) THE EFFECT OF TRAFFIC ON DENSITY OF THE PAVEMENT AFTER THREE YEARS OF SERVICE, AND (5) REFLECTION CRACKING AS RELATED TO DESIGN. A CORRELATION WAS FOUND TO EXIST BETWEEN THE LABORATORY COMPACTED EFFORT FOR DESIGN PURPOSES AND THE DENSITIES OBTAINED FROM CORES TAKEN FROM THE ROAD WHICH SHOWED THE RESULTS OF CONSTUCTION ROLLING. AFTER SEVERAL YEARS OF CLOSE OBSERVATION AND CONTACT WITH LABORATORY DESIGN AND FIELD PRACTICE IN PLACING BITUMINOUS PLANT MIX SURFACES, IT WAS FOUND: (1) DURABILITY AND STABILITY OF BITUMINOUS WEARING SURFACES ARE DIRECTLY RELATED TO DENSITIES THAT ARE OBTAINED DURING CONSTRUCTION, (2) NO DIRECT RELATIONSHIP WAS FOUND BETWEEN THE OCCURRENCE OF STRIPPING OF THE ASPHALT FILMS FROM AGGREGATE PARTICLES AND INSTABILITY OF THE MIXTURE, (3) NO DIRECT RELATION WAS FOUND BETWEEN THE TYPE OF COARSE AGGREGATE AND PAVEMENT PERFORMANCE, (4) THERE SEEMS TO BE A RELATIONSHIP BETWEEN THE RANGE OF OPTIMUM BITUMEN CONTENTS AND THE TYPE OF COARSE AGGREGATE, (5) THE ENRICHED SECTIONS, AS SHOWN BY SAMPLE ANALYSIS, EVIDENTLY ARE NOT DUE TO THE TACK COAT APPLICATIONS, AND (6) THERE APPEARS TO BE LITTLE DIFFERENCE IN THE EFFECTIVENESS OF AP-3 OR RC-2 MATERIALS WHEN USED AS TACK COATS. OBSERVATION SHOWS THAT THE ENRICHED PORTIONS OF THE SECTIONS ARE NOT GIVING AS GOOD SERVICE AS THE SECTIONS IN WHICH THE ASPHALT CONTENT IS NEAR THE LABORATORY DESIGN.

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  • Accession Number: 00207020
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jul 7 1994 12:00AM