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Additive capable of improving bending strength and tensile strength of cement base material and its preparation method
The invention discloses an additive capable of improving bending strength and tensile strength of a cement base material. The additive is an aqueous dispersion of organic-inorganic hybrid particles with core-shell structures. Each organic-inorganic hybrid particle is composed of inner and outer layers, wherein the inner layer is an organic polymer core; the outer layer is an inorganic composite oxide or an inorganic composite oxide covalently connected with an organic functional group; the inorganic composite oxide is a silicon-calcium composite oxide or a silicon-magnesium composite oxide or a silicon-calcium-magnesium composite oxide; and the outer layer is in covalent connection with an electronegative organic polyelectrolyte internally. Compared to the mixing amount of a polymer or polymer fiber in a pure polymer-modified cement base material or a polymer fiber-modified cement base material, the mixing amount of the additive in the cement base material can be greatly reduced; and the additive can more obviously improve the splitting tensile and bending resistant performances of the cement base material in comparison with a traditional polymer emulsion in the same mixing amount. Therefore, the additive overcomes the disadvantage that the high polymer mixing amount of the traditional polymer modified cement base material affects the compressive strength of the cement base material, and can effectively improve the bending strength and tensile strength (or splitting tensile strength) of the cement base material.
Additive capable of improving bending strength and tensile strength of cement base material and its preparation method
The invention discloses an additive capable of improving bending strength and tensile strength of a cement base material. The additive is an aqueous dispersion of organic-inorganic hybrid particles with core-shell structures. Each organic-inorganic hybrid particle is composed of inner and outer layers, wherein the inner layer is an organic polymer core; the outer layer is an inorganic composite oxide or an inorganic composite oxide covalently connected with an organic functional group; the inorganic composite oxide is a silicon-calcium composite oxide or a silicon-magnesium composite oxide or a silicon-calcium-magnesium composite oxide; and the outer layer is in covalent connection with an electronegative organic polyelectrolyte internally. Compared to the mixing amount of a polymer or polymer fiber in a pure polymer-modified cement base material or a polymer fiber-modified cement base material, the mixing amount of the additive in the cement base material can be greatly reduced; and the additive can more obviously improve the splitting tensile and bending resistant performances of the cement base material in comparison with a traditional polymer emulsion in the same mixing amount. Therefore, the additive overcomes the disadvantage that the high polymer mixing amount of the traditional polymer modified cement base material affects the compressive strength of the cement base material, and can effectively improve the bending strength and tensile strength (or splitting tensile strength) of the cement base material.
Additive capable of improving bending strength and tensile strength of cement base material and its preparation method
RAN QIANPING (author) / SHU XIN (author) / LIU HAO (author) / YANG YONG (author) / YU CHENG (author) / LIU JINZHI (author) / LIU JIAPING (author)
2015-05-13
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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