RE-TESTING OF CARBORUNDUM HIGHWAY SAFETY GRAIN OF THE ORTEGA RIVER BRIDGE ON US 17 IN JACKSONVILLE, FLORIDA

THE FINAL INSPECTION WAS CONDUCTED OF MATERIAL ON THE METAL GRID DECK OF THE ORETEGA RIVER BRIDGE AFTER NINE MONTHS SERVICE. SECTIONS A AND B WERE SANDBLASTED AND THE HIGHWAY SAFETY GRAIN WAS APPLIED IN TWO COATS. THE INSPECTION INDICATED THAT SECTIONS A AND B SHOWED APPROXIMATELY 85 TO 95% OF THE MATERIAL HAD WORN OFF THE SMALLER TRANSVERSE INTERMEDIATE BARS AND FROM 5 TO 15% WORN OFF THE LARGE TRANSVERSE BARS. SECTION C WAS SANDBLASTED AND THE TWO GRADATIONS OF CARBORUNDUM HIGHWAY SAFETY GRAIN MIXED AND APPLIED. THE INSPECTION INDICATED THAT SECTION C SHOWED THE LEAST AMOUNT OF WEAR WITH 50% TO 65% WEAR ON THE INTERMEDIATE BARS AND APPROXIMATELY 5% TO 65% WEAR ON THE LARGER TRANSVERSE BARS. SECTION D WAS HAND SANDED INSTEAD OF SANDBLASTED, AND 50% OF EACH SAFETY GRAIN MIX USED. INSPECTION OF THIS SECTION INDICATED APPROXIMATELY 100% OF THE MATERIAL WAS WORN OFF THE WHEEL PATHS. IT IS CONCLUDED THAT THE COMBINATION OF THE TWO TYPES OF HIGHWAY GRAIN IS MUCH MORE DURABLE. THIS INCREASE IN DURABILITY IS PROBABLY DUE TO THE DENSITY OF THE AGGRAGATE IN THE MIXTURE. THIS MATERIAL LASTED EFFECTIVELY FOR APPROXIMATELY SIX MONTHS AND A RE-COATING OF THE DECK PRIOR TO THE COMPLETE WEARING OFF OF THE MATERIAL WOULD HAVE PROLONGED THE LIFE OF THIS DE- SLICKING OPERATION FOR AT LEAST ANOTHER SIX MONTHS AT THE PRESENT RATE OF WEAR. THE APPROXIMATE CLOSING TIME OF 1 HR & TWENTY MINUTES REQUIRED IN EACH LANE OF TRAFFIC WHILE THE MATERIAL IS CURING OUT AFTER APPLICATION DOES NOT SEEM UNREASONABLE. IT IS BELIEVED THAT THIS METHOD OF DE-SLICKING METAL GRID BRIDGE DECKS IN BOTH ECONOMICAL AND PRACTICAL.

• Supplemental Notes:
  • No 83-c, 2 PP
• Publication Date: 1966-3-25

Media Info

• Serial:
  • Florida State Road Dept Research Bull

Subject/Index Terms

• TRT Terms: Aggregate gradation; Aggregates; Blast cleaning; Bridge decks; Density; Grates; Inspection; Metals; Oil spill cleanup
• Old TRIS Terms: Carborundum safety grain; Combinations; Deslicking treatment; Gridworks (Structures)
• Subject Areas: Geotechnology; Highways; Maintenance and Preservation;

Filing Info

• Accession Number: 00218243
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 2 1994 12:00AM