SULFATE RESISTING GROUND GRANULATED BLAST FURNACE SLAG, SULFATE RESISTANT CEMENT, AND METHOD OF PRODUCTION OF SAME

摘要

In preparing a sulfate-resisting cement by blending ground granulated blast furnace slag with Portland cement and high-dissolution-rate gypsum serving to enhance sulfate resistance, it is difficult to blend high-dissolution-rate gypsum uniformly with ground granulated blast furnace slag and Portland cement, because the particle size and specific gravity of high-dissolution-rate gypsum are different from those of Portland cement.  Uniform blending of blast furnace slag with Portland cement and high-dissolution-rate gypsum is essential in order to prepare a sulfate-resisting cement exhibiting homogeneous early solidification properties. A uniformly blended sulfate-resisting cement can be obtained by pre-blending a ground granulated blast furnace slag having an alumina content of 12 to 17.5% with highdissolution-rate gypsum and then blending the obtained pre-blend with Portland cement. It is preferable that the high-dissolution-rate gypsum is hemihydrate gypsum, III-type anhydrous gypsum, or anhydrous gypsum having a specific surface area of 8000 or above in terms of Blaine value.