PRACTICAL GRADATION LIMITS FOR NATURAL AGGREGATE BITUMINOUS CONCRETE (NABC)

BECAUSE COUNTY AND MUNICIPAL AGENCIES OFTEN CANNOT AFFORD PREMIUM QUALITY BITUMINOUS CONCRETE TO PRODUCE HEAVY DUTY PAVEMENTS, THE SURFACES OF SIDE ROADS AND LOCAL STREETS CAN DETERIORATE RAPIDLY WHEN SUBJECTED TO HEAVY VEHICLES. THE ANSWER FOR SUCH SURFACES HAS BEEN MIXED-IN-PLACE CONSTRUCTION OR SURFACE TREATMENT. THE ADVOCATES OF PLANT MIX, HOWEVER, FEEL THAT HOT-PLANT-MIX SHOULD REPLACE ROAD- MIX AND TREATMENT WORK IF COSTS CAN BE KEPT LOW ENOUGH. THE AIM IS, OF COURSE, A ROAD BETTER ABLE TO WITHSTAND THE OCCASIONALLY HEAVY AXLE LOADS, SPRING THAWS, AND RAINY SEASONS. TO COMPETE SUCCESSFULLY ON A COST BASIS, THE GRADATION SPECIFICATIONS MUST NOT BE SO RESTRICTIVE THAT LARGE QUANTITIES OF MATERIALS HAVE TO BE RESIZED OR WASTED. THEREFORE, ONE OF THE PURPOSES OF THIS WORK IS TO ESTABLISH OPTIMUM GRADATION CURVES AND ALLOWABLE TOLERANCES FOR NATURAL AGGREGATE BITUMINOUS CONCRETE. ANOTHER PURPOSE IS TO FOSTER THE BETTER UTILIZATION OF LOCAL MATERIALS AND TO ENCOURAGE MUNICIPAL AND COUNTY ENGINEERS AND CONTRACTORS TO UTILIZE BETTER THE WELL-RECOGNIZED ADVANTAGES OF HOT-PLANT- MIX CONSTRUCTION METHODS FOR PROVIDING SUPERIOR AND MORE TROUBLE-FREE PAVEMENTS FOR STREETS AND SECONDARY ROADS AT REDUCED OVERALL COST.

Subject/Index Terms

Filing Info

  • Accession Number: 00210892
  • Record Type: Publication
  • Source Agency: Highway Research Board Bibliography
  • Files: TRIS
  • Created Date: Feb 8 1971 12:00AM