REPORT 2--ANALYSIS OF VARIOUS DATA OBTAINED DURING AND AFTER CONSTRUCTION

A VARIABLE-DEPTH BITUMINOUS CONCRETE PAVEMENT WAS PLACED IN BOTH SOUTHBURY AND GROTON AS SATELLITE PROJECTS OF THE AASHO ROAD TEST. EVALUATION OF THESE PAVEMENTS HAS BEEN DIFFICULT BECAUSE OF A GENERAL LACK OF CONSTRUCTION INFORMATION, LOCAL CLIMATOLOGICAL DATA AND TRAFFIC DATA. IN GROTON, IT WAS FOUND THAT THE DEPTH OF THE CONSTRUCTED AND SPECIFIED SURFACE LAYERS VARIED TO THE EXTENT WHERE THE ORDER OF CERTAIN SECTIONS WOULD HAVE TO BE ALTERED AT LEAST WITH RESPECT TO SURFACE DEPTH. NO DATA ON ACTUAL DEPTHS OF BASE AND SUBBASE HAVE BEEN OBTAINED. THE RESULTS OF CERTAIN TESTS PERFORMED ON THE PAVEMENT ARE THEREFORE RENDERED MEANINGLESS, SINCE THE DEPTHS OF THESE COURSES WERE PRINCIPAL VARIABLES. FOR EXAMPLE, THE VARIATION OF AMOUNT OF CRACKING, RUTTING AND ROUGHNESS DOES NOT CORRELATE WITH TOTAL DEPTH OF PAVEMENT. ADDITIONAL FINDINGS INCLUDE THE FOLLOWING: (1) IN ALL EXPERIMENTAL SECTIONS, THE BITUMINOUS CONCRETE SURFACE COURSE IS DENSE AND HAS A LOW VOID CONTENT. IN SPITE OF THIS, THERE HAS BEEN NO APPARENT BLEEDING. (2) CRACKING IS PRIMARILY LONGITUDINAL AND WITHIN THE WHEEL PATHS IN THOSE SECTIONS WHERE IT OCCURS. IN ONE SECTION THERE IS NO CRACKING. THERE APPEARS TO BE A BETTER CORRELATION BETWEEN CRACKING AND THE PENETRATION INDEX OF THE MIX, DETERMINED FROM TESTS PERFORMED ON PAVEMENT CORES, THAN BETWEEN CRACKING AND OTHER FACTORS. (3) AVERAGE RUT DEPTHS ARE ONLY ABOUT 1/16 INCH. AND (4) REBOUND DEFLECTIONS HAVE DECREASED WITH TIME TO APPROXIMATELY 50 PERCENT OF THE INITIAL VALUE. THERE IS LITTLE OR NO CORRELATION BETWEEN DEFLECTIONS AND EITHER DEPTH OF PAVEMENT OR AMOUNT OF CRACKING. /AUTHOR/

• Corporate Authors:

  Connecticut Department of Transportation

  Bureau of Highways, 24 Wolcott Hill Road, P.O. Drawer A
  Wethersfield, CT  United States  06109

  Bureau of Public Roads /US

  400 7th Street, SW
  Washington, DC  United States  20590
• Authors:
  • Bowers, D G
• Publication Date: 0

Subject/Index Terms

• TRT Terms: Asphalt concrete; Concrete pavements; Construction; Depth; Fracture mechanics; Pendulum tests; Ruts (Pavements); Surface course (Pavements)
• Uncontrolled Terms: Rut
• Subject Areas: Construction; Highways; Pavements;

Filing Info

• Accession Number: 00206418
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Report/Paper Numbers: 132-3
• Files: TRIS, STATEDOT
• Created Date: Sep 28 1970 12:00AM