| 摘要 |
<p>According to the invention, a cement is proposed, wherein the cement clinker comprises a composition similar to sulfate slag cement produced from slag, namely: CaO: 31-46%, preferably 31-43%; SiO2: 31-40%; AI2O3: 13-24%; said cement clinker is preferably ground with 5-12% by weight SO3 to a Blaine value of 4500-6000 cm2/g for sulfate activation. However, it can also be used as a grinding additive to Portland cement. A cement having this composition can be produced by mixing clay and/or fly ash with a CaO carrier, firing it, and grinding the resulting clinker together with 5-12% by weight SO3 to a Blaine value of 4500-6000 cm2/g. The firing temperature is preferably only 1200ºC to 1300ºC. Limestone, but preferably already fired products, in particular fiber concrete, may be used as the CaO carrier. Such a cement produces considerably less CO2 than Portland cement during the production thereof, yet achieves similar strengths.</p> |
