Shrinkage inhibition of cementitious systems through the addition of specially processed carbonaceous materials

摘要

Naturally occurring particulate carbonaceous materials are rendered capable of counteracting or 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 carbonaceous materials which are already capable of inhibiting shrinkage in the cementitious systems. Effective shrinkage inhibition is also obtained by adding particular amounts of anthracite coal to such a system containing aggregate. The compressive strength of the systems incorporating the shrinkage counteracting or inhibiting carbonaceous materials of this invention remains within acceptable limits when effective non-shrink properties are obtained.