Hydraulic cement with accelerated high strength development

Details Hydraulic cement with accelerated high strength development Hydraulic cement with accelerated high strength development

C - Chemistry, Metallurgy

04

B

C04B 11/28 (2006.01) C04B 7/32 (2006.01) C04B 7/36 (2006.01)

Patent

CA 2193339

The invention consists in a method of manufacturing cements based on calcium sulfoaluminate, consisting in the format ion of a klinker through the roasting of raw materials to temperatures of more than 1200°C in such a manner that the klinker thus produced has a high content of calcium sulfoaluminate, tricalcium silicate and dicalcium silicate and, during the milling thereof or prior to the milling thereof adding to the klinker thus produced with the above recited basic components, optimal amounts of calcium oxide or hydroxide and calcium sulfate, in order to activate said klinker. Upon said milling, a temperature of about 100 to 125°C is to be observed and a time enough to convert gypsum to hemihydrate, thus making that the calcium sulfate present in the thus obtained product be in a condition to react quickly during tyre hydration of said cement; thus giving place to the formation of etringite; for which the presence of a pH above 12 is needed. Of course, it is also claimed as a novelty the activated cement, resulting from the calcination and milling methods of this invention.

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