This article describes a recently developed asphalt patching machine which could generate considerable cost savings by reduction of personnel, elimination of repeat repairs, and reduction of equipment needs and waste of materials. It was designed primarily to do spot patching in asphalt pavement and uses hot mix, tack coat oil, and mechanical tampers. A thermostatically-controlled heated supply hopper carries a normal 6- to 8-hour working supply of asphalt and can be raised and lowered to facilitate loading from a dump truck. Material temperature can be maintained up to 350 degrees F as required, depending on the type of material being processed. There is a 36 gallon heated tack oil supply tank, a 12 gallon diesel oil tank and a 125 gallon propane tank. The articulated work arm is located at the center front of the vehicle and folds back for driving and storage. The shoulder joint rotates 180 degrees, and the elbow joint rotates 240 degrees allowing coverage of a full lane width from center line to shoulder. The arm is hydraulically controlled and contains an asphalt distribution hopper, tamper (40 foot/lb. pressure and 7-1/2" square), tack oil spray and electrically-ignited twin propane burners which may be adjusted for height to compensate for wind conditions and depth of the repair. The heat generated by these burners helps maintain the temperature of the material in the distribution hopper during the repair process. Material is moved from the supply hopper to the distribution hopper by means of an augur. A typical repair sequence would include: (1) Swing are under supply hopper and fill distribution hopper; (2) Heat area to be repaired; (3) Spray with tack oil; (4) Heat again; (5) Place asphalt repair material from distribution hopper; and finally, (6) Tamp in place (using heat and/or tack spray as desired to seal). An average 1-1/2 square foot repair using the above sequence requires one to two minutes, depending on the operator.

  • Corporate Authors:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Johnson, L L
  • Publication Date: 1979-1

Media Info

  • Features: Photos;
  • Pagination: p. 19-22
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00197132
  • Record Type: Publication
  • Files: TRIS, USDOT
  • Created Date: Nov 7 1979 12:00AM