| 摘要 |
<p>PURPOSE:To obtain cement admixture imparting high strength and high durability by utilizing aluminum hydroxide, gypsums or pozzolanic material as a main component. CONSTITUTION:A concrete product having high strength and high durability can be obtained by utilizing cement admixture constituted of aluminum hydroxide, gypsums and/or pozzolanic material as a main material and enhancing strength, resistance to salt and resistance to sulfate and inhibiting alkali- aggregate reaction. Both amorphous and crystalline aluminum hydroxide can be utilized. The grain size thereof is preferably regulated to about 2500cm<2> or more Blaine specific surface area. Further anhydrous gypsum II is suitable as gypsums and Blaine specific surface area is preferably regulated to about 3000cm<2> or more. On the other hand, silica hume and blastfurnace slag, etc., are utilized as pozzolanic material and the Blaine specific surface area is preferably regulated to about 4000cm<2> or more. The blending amount thereof is properly regulated to about 0.5-15 pts.wt. aluminum hydroxide, about 1-25 pts.wt. gypsums (expressed in terms of CaSO4) and about 1-20 pts.wt. pozzolanic material for 100 pts.wt. cement.</p> |
