摘要:
The present invention discloses a process for producing both steam power and the fast-burnt cement clinker/fast burnt modified coal ash simultaneously in one apparatus, the fast-burnt cement clinker/fast-burnt modified coal ash prepared by said process as well as cement products prepared using them as active substance. It also discloses the apparatus suitable for embodying this process. Said process of the present invention possesses the technoligical features of fast-burning and fast-cooling and contributes a good hydraulic cementitious activity to the said fast-burnt cement clinker/fast-burnt modified coal ash which are capable of being directly used as active substance in cement production of high quality.
摘要:
A cementitious composition comprising Portland cement and a finely divided limestone accelerator. The Portland cement has a fineness of at least about 3,200 Blaine. The composition may contain one or more blast furnace slags or pozzolans, such as fly ash or silica fume. When pozzolans or slags are present, the weight ratio of limestone to a mortar mixture of Portland cement, limestone, sand, water, and pozzolans or blast furnace slags, is in the range of about 1.4% to about 5.6%. The finely divided limestone acts as an accelerator, decreasing the initial set time of the resulting composition, and increasing the rate of strength gain.