| 摘要 |
<p>PURPOSE:To obtain cement admixture capable of enhancing durability, weather resistance and frost damage resistance by constituting the cement admixture of both anhydrous gypsum II and pozzolanic substance having specified composition. CONSTITUTION:Cement admixture is obtained by utilizing 100 pts.wt. anhydrous gypsum II and >40-500 pts.wt. pozzolanic substance as a main component. Furthermore cement composition enhanced in durability especially weather resistance and frost damage resistance is obtained by utilizing 100 pts.wt. cement and 3-30 pts.wt. cement admixture as the main component. Fineness of anhydrous gypsum II is preferably regulated to about 3000cm<2>/g or more Blaine value. Further as pozzolanic substance, fly ashes having about 6000cm<2>/g or more Blaine value are preferably utilized. Silica hume, aerogel, diatomaceous earth and rice straw ash, etc., are utilized. Atmospheric-pressure steam curing is preferably performed for morter or concrete utilized with this cement admixture at about 100 deg.C or below.</p> |
