Flow properties of dry cementitious materials

A method of storing one or more dry particulate cementitious materials in a storage tank, transporting the storage tank and cementitious materials to a location of use and then conveying the cementitious materials out of the storage tank comprising dry-blending a particulate flow enhancing additive with said cementitious materials for improving the dry flow properties thereof prior to placing said cementitious materials in said storage tank, said additive being comprised of a particulate solid adsorbent material having a flow inducing polar molecule producing chemical selected from the group of organic acids, their salts and acid anhydrides adsorbed thereon, wherein the weight ratio of said solid adsorbent material to said flow inducing chemical in said flow enhancing additive is in the range of from about 90:10 to about 10:90 and wherein said flow enhancing additive is blended with said cementitious materials in an amount in the range of from about 0.01% to about 1.0% by weight of said cementitious materials.

A method of storing one or more dry particulate cementitious materials in a storage tank, transporting the storage tank and cementitious materials to a location of use and then conveying the cementitious materials out of the storage tank comprising dry-blending a particulate flow enhancing additive with said cementitious materials for improving the dry flow properties thereof prior to placing said cementitious materials in said storage tank, said additive being comprised of precipitated silica powder having glacial acetic acid adsorbed thereon, wherein the weight ratio of said precipitated silica powder to said glacial acetic acid in said flow enhancing additive is in the range of from about 90:10 to about 10:90 and wherein said flow enhancing additive is blended with said cementitious materials in an amount in the range of from about 0.01% to about 1.0% by weight of said cementitious materials.