method for preventing shrinkage of cement based materials by addition of special funds.

摘要

S P E C I F I C A T O NSHRINKAGE INHIBITION OF CEMENTITIOUS SYSTEMSTHROUGH THE ADDITION OF SPECIALLYPROCESSED CARBONACEOUS MATERIALSInventor: ROBERT W. GAINESABSTRACT OF THE DISCLOSURENaturally occurring particulate carbonaceous mater-ials are rendered capable of inhibiting shrinkage when addedto cementitious systems by special processing including heattreatment at temperatures substantially higher than dryingtemperature. Further advantageous properties are obtained bycontacting the material with a water spray at the heatingtemperature. The treatment enhances the properties of car-bonaceous materials which are already capable of inhibitingshrinkage in the cementitious systems. Shrinkage inhibitionis also obtained by adding anthracite coal to a cementitioussystem. Bleeding is eliminated by the addition of a particu-late carbonaceous material which will inhibit shrinkage.