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Altering the properties of concrete by altering the quality or geometry of the intergranular contact of filler materials

  • US 3,927,163 A
  • Filed: 12/19/1969
  • Issued: 12/16/1975
  • Est. Priority Date: 01/21/1969
  • Status: Expired due to Term
First Claim
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1. A METHOD FOR PREPARING CONCRETE COMPRISING DRY MIXING GRADED DRY AGGREGATE WITH DRY CEMENT COMPOSITION IN A PREPARATION SUCH THAT (1) THE INDIVIDUAL PARTICLES OF THE CEMENT COMPOSITION ARE UNIFORMLY SMALLER THAN THE INDIVIDUAL PARTICLES OF THE AGGREGATE AND ARE SMALLER THAN THE THE INDIVIDUAL VOID SPACES BETWEEN THE ADJACENT AGGREGATE PARTICLES OF THE CEMENT FREE DRY COMPACTED AGGREGATE, AND (2) THE BULK VOLUME OF DRY COMPACTED CEMENT COMPOSITION IN THE FINISHED CONCRETE IS APPROXIMATELY EQUAL TO THE BULK VOLUME OF TOTAL VOID SPACE IN THE DRY COMPACTED CEMENT-FREE AGGREGATE, FILLING THE MOLD WITH THE RESULTANT DRY MIXTURE, COMPACTING THE DRY MIXTURE IN THE MOLD TO REDUCE SUBSTANTIALLY THE VOLUME OF VOID SPACE AND TO FORCE THE AGGREGATE PARTICLES INTO DIRECT CONTACT WITH EACH OTHER AND THE CEMENT COMPOSITION PARTICLES INTO THE SPACES BETWEEN THE AGGREGATE PARTICLES, PROVIDING A POSITIVE ESCAPE PATH FOR THE AIR PRESENT IN THE COMPACTED DRY MIXTURE, ADDING WATER DISTRIBUTING IT WITH THE AID OF THE INHERENT CAPILLARY ACTION OF THE MIXTURE WHILE PREVENTING THE WATER FROM BLOCKING THE ESCAPE PATH ALONG AS THERE IS AIR TO ESCAPE BY IT, SO THAT THE WATER SWEEPS THE AIR FROM THE REMAINING VOIDS AND EJECTS THAT AIR BY MEANS OF THE POSI:

  • TIVE ESCAPE PATH INTO THE ATMOSPHERE, THE AMOUNT OF WATER ADDED BEING DETERMINED BY THE INHERENT CAPILLARY ACTION WHICH CEASES WHEN THE INITIALLY REMAINING VOIDS HAVE HAD THEIR AIR REPLACED WITH THE WATER, AND CURING THE RESULTANT WET COMPACT MIXTURE IN THE MOLD UNTIL IT HAS GAINED SUFFICIENT STRENGTH FOR SAFE REMOVAL, SAID CURING RESULTING IN PRELOADING OF THE POINTS OF CONTACT BETWEEN THE AGGREGATE PARTICLES BY VIRTUE OF SHRINKAGE OF THE HYDRATING CEMENT.

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