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SINGLE SYSTEM MIXES, PLACES CONCRETE

PROTOTYPE EQUIPMENT FOR ONSITE MIXING AND PLACING OF CONCRETE USING AIR PRESSURE HAS BEEN DEVELOPED AND FIELD TESTED BY A DALLAS COMPANY THAT SAYS THE TECHNIQUE WILL IMPROVE QUALITY AND REDUCE COSTS. THE COMPANY, TETRADYNE CORP., CALLS ITS SYSTEM FOR AIR- CONVEYED CONCRETE CMP (CONCRETE MIXING AND PLACING). BECAUSE ALL MIXING IS DONE ONSITE IN A SINGLE SYSTEM OF HOSES AND MIXING CONES, TETRADYNE CLAIMS THE METHOD WILL CUT MANPOWER REQUIREMENTS, INCREASE PRODUCTIVITY AND ELIMINATE INVESTMENT IN THE USUALLY REQUIRED BATCH PLANTS AND TRANSIT MIX TRUCKS. BASICALLY, THE THE LARGEST OF SEVERAL PROTOTYPES DEVELOPED SO FAR BY TETRADYNE SYSTEM, CONNECTED WITH HOSES, CONSISTS OF A BLOWER, A FEEDER CONE, A WATER INJECTOR, AND A MIXING CONE. PROPORTIONED AMOUNTS OF SAND, CEMENT AND AGGREGATE ARE FED INTO THE FEEDER CONE. FROM THERE THE SOLIDS, ENTRAINED IN THE AIR STREAM, MOVE THROUGH THE HOSE TO WHERE, JUST AHEAD OF THE MIXING CONE, WATER IS INJECTED. ALL MATERIAL THEN FLOWS INTO THE MISING CONE AT UP TO 150 FT PER SECOND. THE MIXING CONE IS THE SYSTEM'S LAST STEP. IT IS AT THE END OF THE DELIVERY HOSE AND FROM IT CONCRETE FLOWS INTO FORMS. TETRADYNE HAS BEEN USED TO PLACE DRIVEWAYS AND PATIOS IN INACCESSIBLE AREAS MORE THAN 200 FT AWAY FROM THE BLOWER. TETRADYNE SAYS THE SYSTEM IS CAPABLE OF DELIVERING CONCRETE AT DISTANCES OF UP TO 600 FT AND ELEVATIONS TO 300 FT AT A RATE OF 60 CU YD PER HOUR WITH A LARGE BLOWER. /ARTICLE/

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  • Features: Photos;
  • Pagination: p. 13
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Filing Info

  • Accession Number: 00214191
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 7 1973 12:00AM