Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing
Reexamination Certificate
1999-03-09
2001-09-18
Marcantoni, Paul (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Inorganic settable ingredient containing
C501S144000, C501S145000, C501S150000
Reexamination Certificate
active
06290771
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an activated kaolin powder compound for mixing with cement. More particularly, this invention relates to an activated kaolin powder compound for mixing with cement so as to provide mortar or concrete having good physical properties in strength, water permeability, etc. This invention also relates to a method of preparing the activated kaolin powder compound.
BACKGROUND OF THE INVENTION
In general, mortar or concrete using cement requires excellent strength and water permeability. A number of various researches have been carried out to prepare mortar or concrete having excellent physical properties in strength, water permeability, etc. For this purpose, many researches have been continued both in the field of cement and in the field of other mixing components used with the cement. As one of the mixing components, silica fume has been developed to prepare mortar or concrete having excellent physical properties in strength, water permeability, etc. when it is used with cement. However, the silica fume is very expensive and cannot be widely used at present.
Accordingly, the present inventors have developed an activated kaolin powder compound for using with cement so that the mortar or concrete prepared from the composition of cement and the activated kaolin powder shows good properties in strength and water permeability. The kaolin is naturally buried under the ground and can be obtained in a much lower cost than the silica fume.
OBJECTS OF THE INVENTION
An object of the present invention is to provide an activated kaolin powder compound which can be used with cement.
Another object of the invention is to provide an activated kaolin powder compound to prepare mortar or concrete having good properties in strength and water permeability, when the activated kaolin powder compound is together used with cement.
A further object of the invention is to provide a method of preparing an activated kaolin powder compound from a naturally-existing kaolin.
A still further object of the invention is to provide mortar or concrete having excellent strength and water permeability, which can be prepared by using an activated kaolin powder compound of this invention in a lower cost.
The foregoing and other objects of the present invention will be achieved in the following description.
SUMMARY OF THE INVENTION
The activated kaolin powder compound is prepared from naturally-existing kaolin (hereinafter “natural kaolin”). The activated kaolin powder compound is prepared by heating natural kaolin to 480° C. for a time period up to one hour, calcinating the heated natural kaolin at 800~950° C. over at least 15 minutes, quenching the calcinated kaolin with water or air, and pulverizing the quenched activated kaolin to give powder having particle sizes 2 &mgr;m or less.
The activated kaolin powder compound is employed in an amount of about 5 to 15% by weight of cement for preparing mortar or cement.
The cement composition containing the activated kaolin powder compound can provide a mortar or concrete having excellent properties in compressive strength, flexural strength and water permeability.
REFERENCES:
patent: 4640715 (1987-02-01), Heitzmann et al.
patent: 5976241 (1999-11-01), Kim et al.
patent: 19608841 (1997-08-01), None
patent: 1074 280 (1967-07-01), None
patent: 0627 1350 (1994-09-01), None
“Study of Kaolinite Disordered by Quenching”, Mannan et al., Indian Journal of Physics, (1987), 61A (6), pp. 542-535.
Cha Hee Sung
Hwang Hey Zoo
Hwang Jung Ha
Kim Kwang Choon
Kim Moon Han
Dickinson Wright PLLC
Kim Moon Han
Marcantoni Paul
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