| 摘要 |
Setting time of a hydraulic cement based on clinker contg. 5-60 wt.% of 11 CaO. 7 Al2O3, CaX2 (X being a halogen), >5 wt.% of a solid soln. of 3 CaO. SiO2, and furthermore a solid soln. of 2 CaO. SiO2 and 4 CaO. Al2O3. Fe2O3, is controlled by the addn. of anhydrite and/or CaSO4. 0.5 H2O, and >=1 substance selected from sugars, NaHCO3, water-soluble phosphates, fluorosilicates, sodium silicates, carboxylic acids, ligminsulphonates, sulphuric acid esters of higher alcohols, and alkylsulphonates; with the proviso that anhydrite is added in an amt. such that the wt. rati of Al2O3 in the clinker to SO3 in the anhydrite is 0.7-1.8. The setting time is 7-40 mins. high early strength is achieved; the workability of the material is good. |
