SCIENTIFIC MIXING BEEFS CONCRETE

A NEW PROCESS IS PRESENTED FOR MIXING CONCRETE WHICH IS CLAIMED CAN PRODUCE A MATERIAL THAT CURES THREE TIMES FASTER THAN CONVENTIONAL CONCRETE WITH TWICE THE FLEXURAL STRENGTH AND AT SAVINGS UP TO 25%. IT WAS FOUND THAT BY CONTROLLING THE VIBRATION FREQUENCY, THE ARRANGEMENT OF AGGREGATE COULD BE DETERMINED. THE AGGREGATE-TO-AGGREGATE CONTACT IS GREATLY INCREASED, THEREBY CREATING STRONG CHAINS OF AGGREGATE COURSING THROUGHOUT THE MIX. THE PROCESS CALLED SYNTERCRETE, INVOLVES PLACING IN FORMS A DRY MIX OF CEMENT AND AGGREGATE IN 12 TO 18-IN.-WIDE SHAFTS, SEPARATED BY SQUARE COLUMNS OF SAND. METAL SEPARATORS KEEP THE SAND IN CHECK UNTIL WATER IS ADDED TO THE SAND-COLUMN TOPS. AFTER THE SAND IS SATURATED, WORKERS REMOVE THE SEPARATORS AND THE SAND COLUMNS ACT AS PERFORATED TUBES, DRIPPING WATER INTO THE ADJACENT CEMENT-AGGREGATE MIX. THE WATER, DRAWN BY A SORT OF HORIZONTAL-CAPILLARY ACTION, SUFFUSES THE DRY MIX. HIGH-FREQUENCY VIBRATORS ARE ATTACHED TO THE FORMS, THE FREQUENCY BEING DETERMINED BY THE SIZE OF THE AGGREGATE. THE RESULT IS A NEARLY PERFECT BLEND, WITH A MINIMUM OF VOIDS AND A MAXIMUM OF INTERAGGREGATE CONTACT. TESTS OF 32 SYNTERCRETE MIX DESIGNS SHOWED THAT FLEXURAL STRENGTHS AFTER 28 DAYS OF CURING RANGED FROM 1,150 TO 1,450 PSI. COST SAVINGS ARE ENUMERATED. ITS GREATEST COST ADVANTAGE APPEARS TO BE IN CONSTRUCTION OF EXTERIOR WALLS FOR STORES, HOMES AND OFFICE BUILDINGS. SYNTERCRETE MAKES LOW-COST SCULPTURAL AND ORNAMENTAL TREATMENT MORE FACILE AND FEASIBLE.

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  • Supplemental Notes:
    • Vol 182, No 15, P 63, 1 PHOT
  • Publication Date: 1969-4-10

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  • Accession Number: 00213424
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 12 1970 12:00AM