"SKINNY MIX" BROADENS COST RANGE OF OVERLAYING AGING PAVEMENTS

IN THIS METHOD WHICH COSTS ONLY ABOUT $4,100 PER TWO-LANE MILE, A SAND ASPHALT MIX IS PLACED ABOUT 0.5 IN. DEEP BY MAINTENANCE FORCES. THE SKID BOX CONSISTS OF A SMALL HOPPER MOUNTERD ON TWO SKIDS ABOUT 20 FT. LONG. AN ADJUSTABLE STRIKE-OFF PLATE DIVIDED IN THE MIDDLE OF THE BOX, CONTROLS DEPTH AND CROSS-SECTIONAL SHAPE. THREE PASSES OF THE BOX ARE REQUIRED TO PAVE A 24-FT ROADWAY. THE BOX IS LIFTED BY THE LOADER WHEN A PASS IS COMPLETED, AND TRANSPORTED BACK TO START NEW PASSES. THE USE OF GRADERS TO PLACE THE MIX IS DESCRIBED. IN THIS PROCESS IN WHICH THE GRADER BLADE IS MODIFIED BY AN UNDERSIDE HORIZONTAL SHOE, THE MIX IS DUMPED ON THE SURFACE BY THE TRUCKS SPREADING WITH THEIR BODIES RAISED AND TAILGATES HOOKED. THE MIX DESIGN, AND GRADATION LIMITS OF THE MIX WHEN EITHER THE SKID BOX OF GRADER IS USED ARE TABULATED. THE ASPHALT USED WAS AC-5. GOOD RESULTS HAVE BEEN OBTAINED WITH 120 TO 150 PENETRATION GRADE LIQUID. PRELIMINARY DISCUSSION FOCUSES ON THE NEED TO IMPROVE AND MAINTAIN EXISTING HIGHWAYS, THE NEED TO WATERPROOF, THE OVERLAY METHOD, AND AIRVOIDS AND GRADES.

• Publication Date: 1973-1

Media Info

• Features: Photos; Tables;
• Pagination: p. 20-2
• Serial:
  • Rural and Urban Roads
  • Volume: 11
  • Issue Number: 1

Subject/Index Terms

• TRT Terms: Aggregate gradation; Asphaltic sand; Graders; Maintenance; Mix design; Mixtures; Overlays (Pavements); Pavements; Pavers; Paving; Void ratios
• Old TRIS Terms: Air void ratio; Gradation
• Subject Areas: Highways; Maintenance and Preservation; Materials; Pavements;

Filing Info

• Accession Number: 00211793
• Record Type: Publication
• Files: TRIS
• Created Date: Nov 18 1973 12:00AM