GIMMICKS SMOOTH SLIPFORMING WHILE PRODUCING A ROUGH SURFACE
SLIPFORM RUNWAY PAVING WITH A 16-IN. SLAB THAT INCREASES TO 20-IN. THICK AT EXPANSION JOINTS HAVE EASED CONSTRUCTION PROBLEMS AND PRODUCED A SUPERIOR SURFACE. DOWELS WERE PLACED 75 FT APART ON BASKETS FOR TRANSVERSE CONTRACTION JOINTS. TWO-INCH NAILS WERE SHOT THROUGH METAL STRAPS WITH A 22-CALIBER POWDER-ACTUATED TOOL. A CRAWLER SPREADER LED THE AUTOMATED PAVING TRAIN AND PLACED THE FIRST 12-IN. LIFT OF CONCRETE. REINFORCING MATS WERE DROPPED FROM A CART BEHIND IT AND A SECOND SPREADER PLACED THE SECOND LIFT AND THE SLIPFORMER FOLLOWED UP. THE SPREADERS GUIDED OFF A WIRE ON ONE SIDE AND THE SLIPFORMER GUIDED ON BOTH SIDES TO MAINTAIN THE CLOSE TOLERANCES. LIGHTWEIGHT SENSOR ARMS REACHED UP AND OUT LEAVING A LANE THAT LET THE 8.5- CU-YD. SIDE DUMPS MOVE PAST THE PAVING TRAIN WITHOUT HITTING THE SENSORS. MODIFICATIONS IN THE DESIGN OF THE RIGS AND TRUSSES HAVE INCREASED PRODUCTION BY 15 TO 20 PERCENT. OTHER MODIFICATIONS OF THE SLIPFORMER AND PAVER ARE DESCRIBED. A TEXTURING MACHINE WITH A WIRE COMB MADE TRANSVERSE IMPRESSIONS ON 0.5 IN. CENTERS AND PRODUCED A SURFACE NEARLY AS SKID RESISTANT AS GROOVES CUT IN THE THE DRY. PRODUCTION AVERAGED 2,000 FT PER DAY ON THE RUNWAY. THE WATER RETAINING ABILITY OF THE MICOCEOUS SOIL NECESSITATED PROVISION FOR A HERRINGBONE ARRAY OF 6-IN.-DIA PERFORATED PIPES PLACED 100 FT. APART DRAINING INTO 8-IN.-DIA. COLLECTORS. A BASE OF 6-IN OF SOIL CEMENT TOPPED BY 6-IN OF CEMENT STABILIZED-CRUSHED STONE, WAS SPECIFIED BY ENGINEERS.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/08919526
- Publication Date: 1973-3-23
Media Info
- Features: Photos;
- Pagination: p. 75
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Serial:
- Engineering News-Record
- Volume: 190
- Issue Number: 12
- Publisher: McGraw-Hill, Incorporated
- ISSN: 0891-9526
Subject/Index Terms
- TRT Terms: Airport runways; Drainage; Micaceous soils; Roughness; Skid resistance; Slip form paving; Spreaders; Texture
- Subject Areas: Construction; Highways; Hydraulics and Hydrology; Pavements;
Filing Info
- Accession Number: 00215630
- Record Type: Publication
- Files: TRIS
- Created Date: Oct 24 1973 12:00AM