| 摘要 |
<p>PURPOSE: To improve fluidity and to suppress the separation of material, bleeding and a sudden temp. rise by incorporating a compsn. having a specified compsn. and a regulated diameter of materials. CONSTITUTION: Portland cement and powder of water-granulated blast furnace slag are used as principal binders by 27-47 pts.wt. and 20-40 pts.wt., respectively, and they are blended with 20-30 pts.wt. fine calcium carbonate powder, 2-8 pts.wt. fine activated silica powder, 1-3 pts.wt. expansive admixture for cement mixture, 1-3 pts.wt. anhydrous gypsum, 0.3-1 pts.wt. cement dispersant and 0.05-0.2 pts.wt. setting retarder to obtain the objective low exothermic nonshrinkable filler having 10.0-14.0wt.% ignition loss, <=1mm max. diameter of materials and a compsn. consisting of, by weight, 45.0-65.0% CaO, 15.0-27.0% SiO2 , 4.5-6.5% Al2 O3 , 2.0-3.5% MgO, 1.0-1.8% Fe2 O3 , 1.0-2.0% SO3 , 0.14-0.20% Na2 O and 0.20-0.35% K2 O.</p> |
