GUSSASPHALT RESURFACES FIVE MILES OF TOLL ROAD

A FIVE-MILE RESURFACING PROJECT IN PENNSYLVANIA GAVE MUCH INFORMATION (ON MIXING, TRANSPORTING, PLACING METHODS AND PROBLEMS; ALLOWABLE SLOPES; SKID RESISTANCE; WEARING CHARACTERISTICS; EFFECTS OF WINTER WEATHER AND SNOW REMOVAL ACTIVITIES; BASE COMPOSITION AND COSTS) ON THE APPLICABILITY IN THE U. S. OF THE GERMAN PROCESS IN WHICH MATERIAL IS PUT DOWN IN ALMOST LIQUID FORM WITHOUT REQUIRING ROLLING TO ACHIEVE DURABILILITY AND STRENGTH. PROCEDURAL DETAILS CONTRIBUTING TO SUCCESS ARE DESCRIBED. THE AGGREGATE SIZE WHICH PROVIDES WORKABILITY AND FLOW ARE 100 PERCENT PASSING 1/2 IN. SCREEN; 94.8 PERCENT THROUGH A NO. 4 SCREEN; 52.7 PERCENT PASSES A NO. 16 SCREEN AND, AT THE SMALLER END OF THE SCALE, 23.6 PERCENT PASSES A 200 SCREEN. ASPHALTS USAGE INVOLVES TWENTY PERCENT TRINIDAD NATURAL AND THE REST DOMESTIC ADDED TO THE MIX IN PROPORTION OF ABOUT 8 TO 9 PERCENT AND IS DESIGNED FOR A PENETRATION OF 44 AT 72 DEG. MIXING IS AT A TEMPERATURE BETWEEN 420 AND 450 DEG. F. A CONVENTIONAL BARBER-GREENE CONTINUOUS MIX PLANT WAS USED. THE TEMPERATURE AT WHICH THE RELATIVELY THIN LAYERS ARE APPLIED IS IMPORTANT. PROBLEMS ENCOUNTERED IN PRACTICE INCLUDED THOSE WHICH INVOLVED THE MAINTENANCE OF THE HEAT FROM MIXER TO SITE, HANDLING THE MATERIAL AT THE SITE BETWEEN FORMS, IMPRINTING THE SKID PATTERN FORMS, IMPRINTING THE SKID PATTERN, AND THE SPREADING OF "RICE" CHIPS. A TRUCK BODY WHICH CONSISTED IN ESSENCE OF A HEATED TANK WITH ROTATING PADDLES TO KEEP THE MIX FROM SEPARATING, WAS USED TO TRANSPORT THE MIX WITHOUT APPRECIABLE HEAT LOSS. EXPERIMENTATION INDICATES THAT THE IDEAL TEMPERATURE FOR PLACEMENT IS BETWEEN 410 AND 420 DEG. F. THE METHOD OF PREPARATION OF THE SITE AND THE RESOLUTION OF OTHER PROCEDURAL PROBLEMS ARE DETAILED. ADVANTAGES OFFERED BY THE GUSSASPHALT PROCESS INCLUDES LESS WEAR, GREATER SKID RESISTANCE, IMPERVIOUSNESS TO WATER, SMOOTH RIDING SURFACE, AND GREATER INHERENT STRENGTH. SPECIFICATIONS HAVE BEEN DEVELOPED WHICH PERMIT PAVING WORK OF THIS KIND BEYOND THE FALL CUT- OFF DATES ENFORCED IN NORTHEASTERN STATES. LIMITATIONS ON USE OF THE PROCESS ARE ALSO DISCUSSED.

• Publication Date: 1973-1

Media Info

• Features: Photos;
• Pagination: p. 53-5
• Serial:
  • Roads and Streets
  • Volume: 116
  • Issue Number: 1
  • Publisher: Donnelley (Reuben H) Corporation

Subject/Index Terms

• TRT Terms: Aggregates; Asphalt; Cold weather; Mixers; Operations; Resurfacing; Skid resistance; Waterproofing
• Subject Areas: Administration and Management; Construction; Geotechnology; Highways;

Filing Info

• Accession Number: 00215624
• Record Type: Publication
• Files: TRIS
• Created Date: Oct 16 1973 12:00AM