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US 2016/0002106 A1Published application
Lower heat processed calcium sulphates for early strength cements and general use
OwnerMustafa ÖZSÜTinventor
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OwnerMustafa ÖZSÜTinventor
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The Invention is related to increasing of early strength and final strengths of cements classified under EN and ASTM as Portland or CEM cements and also related to all clinker employing cements and to any kinds which employ calcium sulphates for set optimization and is for composing of new cements by only assessing new methods for production and is for composing of new cements by only assessing new methods to formation and inclusion of calcium sulphate resources which are used for set optimization. A new calcium sulphate resource is obtained by employing lower heats and this input is arranged to different dehydration levels at which they can be most efficient for the selected use. These different dehydration levels are called intermediate phases of dehydrate or hemihydrates or called as monohydrate.
As the prevailing method of inclusion of gypsum stones to the clinker at its grinding phase while it is cooling also, gypsum enters into a complex dehydration sequence where a preassumed ratio of it converts to hemihydrates and soluble anhydrites, it is cements that shall yield higher early and final strengths by inclusion of calcium sulphate resources which have a specific dehydration level and method and it consists of a new method of calcium sulphate inclusion to other cement components by inclusion of gypsum stones whom are dehydrated at planned rates by employing a specific heat level in range of 90-145° c. and inclusion at an optimum rate to clinker and other components as the sole or main calcium sulphate resource.
As hemihydrates are defined with 0.5 molecular water in the existing practice, for obtaining different activity powers and functions as per 1-6, it is arranging them in different dehydration levels in range of 0.50-1.0 molecular water like 0.70 or 0.80 molecular water.
For optimization of cement hydration with use of lower CaS04 and S03 inclusion, it is employing of gypsums as per 1-11 down to 1.2% S03 content.
While the phase combinations of gypsums as per claims are being determined by employing the Rietvelt X Ray Dates method, the molecular water lost is not being measured in parallel to this measurement, it is calcium sulphate resources dehydrated at lower heats to a planned dehydration level and it consists of determination method of the fact that these two readings are having differences which are being apparent (higher) at intermediate phase (and reactivity power) change points (peaks) which are specified by the invention as a clear measurement of reactivity power determination method beneath direct measure of reactivity power.
Over 135 C range dehydration causes surface area enlargement expansions and fracturations of gypsum stone crystals and against the prevailing knowledge reactivity power of these products falls down, so it is use of calcium sulphate resources dehydrated at lower heats especially for higher dehydration rates exceeding 3-4% by weight.
It is including the dehydration created at grinding process to the overall dehydration calculations and it is arranging grinding media suitable.
Dependencies are inferred from the claim text.