| 摘要 |
PURPOSE: To produce a mortar for packing presented at an expansion side from an initial period, reaching a certain expansion thereafter and capable of maintaining an expanding volume over a long period of time by mixing plural expanding agents having different expanding period, respectively with a cement mortar. CONSTITUTION: The motor for packing is obtained by mixed the expanding agent consisting of a powder consisting essentially of plural aluminum powders having different expanding period, respectively and calcium oxide or plural aluminum powders and calcium sulfoaluminate(CSA) to the cement mortar. A mixing agent composition in which the expanding agent using 3 kinds aluminum powders is mixed is exemplified by wt.% per cement: 3% calcium oxide based expanding agent (or, 5% CSA based expanding agent), 4% blast furnace slag (8000cm<2> /g), 0.8% fluidizing agent, 0.0003% aluminum powder for admixture of cement, 0.0025% aluminum plant waste material, 0.001% aluminum reagent of class first, 2% gypsum unhydride (or, 0% in the case of CSA based expanding agent), 0.015 anti-foaming agent and 0.02% thickner. |
