Shrinkage inhibition of cementitious systems through the...

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C - Chemistry, Metallurgy

04

B

6/167, 261/56

C04B 7/02 (2006.01) C04B 14/02 (2006.01) C09K 3/00 (2006.01)

Patent

CA 1049708

S P E C I F I C A T O N SHRINKAGE INHIBITION OF CEMENTITIOUS SYSTEMS THROUGH THE ADDITION OF SPECIALLY PROCESSED CARBONACEOUS MATERIALS Inventor: ROBERT W. GAINES ABSTRACT OF THE DISCLOSURE Naturally occurring particulate carbonaceous mater- ials are rendered capable of inhibiting shrinkage when added to cementitious systems by special processing including heat treatment at temperatures substantially higher than drying temperature. Further advantageous properties are obtained by contacting the material with a water spray at the heating temperature. The treatment enhances the properties of car- bonaceous materials which are already capable of inhibiting shrinkage in the cementitious systems. Shrinkage inhibition is also obtained by adding anthracite coal to a cementitious system. Bleeding is eliminated by the addition of a particu- late carbonaceous material which will inhibit shrinkage.

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