A modified calcium oxide expanded clinker, its preparation method and application

A technology of expanded clinker and calcium oxide, which is applied in the field of building material concrete admixtures, can solve the problems of fast hydration speed, weathering resistance of calcium oxide type expanded clinker, poor moisture resistance, weak shrinkage compensation ability, etc., and achieves a long shelf life. , significant social and economic benefits, easy to obtain effects

Active Publication Date: 2017-09-26
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problems in the prior art that the hydration rate of calcium oxide expansion clinker is fast, the early expansion is rapid, the ability to compensate for the contraction in the middle and later stages is weak, and the calcium oxide expansion clinker has poor weathering resistance and moisture resistance, etc., the present invention provides An oxalated surface-coated modified calcium oxide expansion clinker

Method used

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  • A modified calcium oxide expanded clinker, its preparation method and application
  • A modified calcium oxide expanded clinker, its preparation method and application
  • A modified calcium oxide expanded clinker, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation of oxalated-coated modified calcium oxide expanded clinker (using commercially available calcium oxide expanded clinker as raw material)

[0038] Weigh 200.0g of CaO clinker and put it into a 500ml three-necked round-bottomed flask filled with absolute ethanol. A polytetrafluoroethylene stirrer was installed in the middle of the three-neck round bottom flask. A certain mass of oxalic acid (H 2 C 2 o 4 ) into one side port of the three-neck flask. The agitator stirs the CaO clinker at 200r / min; at the same time, a certain quality of oxalic acid is slowly added to the CaO clinker. Through physical adsorption and chemical reaction, a large amount of dense calcium oxalate is formed on the surface of calcium oxide expanded clinker powder. Then, the modified calcium oxide-based expanded clinker is filtered and dried at 60° C., and the oxalated-coated modified calcium oxide-based expanded clinker is separated from the organic solvent. The reaction tempera...

Embodiment 2

[0053] (1) Preparation of self-made calcium oxide expansion clinker modified by oxalated coating (using two self-made calcium oxide expansion clinkers as raw materials)

[0054] With limestone as the main raw material, it is calcined at a temperature of 1300-1400°C, and the specific surface area of ​​the expanded clinker is 330m 2 / kg. Weigh 200.0g of CaO clinker and put it into a 600ml three-necked round-bottomed flask filled with absolute ethanol. A polytetrafluoroethylene stirrer was installed in the middle of the three-neck round bottom flask. A certain mass of oxalic acid (H 2 C 2 o 4 ) into one side port of the three-neck flask. The oxalic acid treatment process is carried out the same as in Example 1. The reaction temperature was controlled at 30°C.

[0055] Table 4 shows the chemical composition (wt.%) of two self-made calcium oxide expansion clinkers.

[0056]

[0057] Table 5 by oxalic acid (H 2 C 2 o 4 ) Process parameters for impregnated CaO clinker s...

Embodiment 3

[0069] (1) Preparation of oxalated-coated modified calcium oxide concrete expansion agent (using 8 commercially available calcium oxide concrete expansion agents with different calcium oxide contents as raw materials)

[0070] Eight commercially available calcium oxide concrete expansion agents with different calcium oxide contents were purchased for oxalic acid surface treatment. Weigh 200.0g of CaO clinker and put it into a 500ml three-necked round-bottomed flask filled with absolute ethanol. A polytetrafluoroethylene stirrer was installed in the middle of the three-neck round bottom flask. A certain mass of oxalic acid (H 2 C 2 o 4 ) into one side port of the three-neck flask. The oxalic acid treatment process is carried out the same as in Example 1. By controlling the amount of oxalic acid added, the amount of calcium oxalate wrapped in the modified clinker was controlled to be 8.0%. The reaction temperature is 40°C.

[0071] (2) Expansion performance and storage pe...

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Abstract

The invention relates to a modified calcium oxide expanded clinker, its preparation method and application. The preparation method of the modified calcium oxide expanded clinker of the present invention is as follows: a large amount of dense calcium oxalate is formed on the surface of the calcium oxide expanded clinker powder by means of physical adsorption and chemical reaction in an oxalic acid solvent, and the modified calcium oxalate is obtained. Calcium oxide expansion clinker. The modified calcium oxide expansion clinker of the present invention can be mixed with a dispersive carrier to form a modified calcium oxide expansion agent for concrete. The oxalated-wrapped modified calcium oxide expansion clinker and its expansion agent prepared by the present invention significantly increase the expansion amount and expansion stress generated by the expansion material in cement concrete, and optimize the expansion history of the expansion clinker and its expansion agent; The anti-weathering and moisture-proof ability of calcium oxide expansion clinker and its expansion agent are improved.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures for building materials, and in particular relates to a modified calcium oxide expansion clinker, its preparation method and its application. Background technique [0002] Concrete is a building material with abundant raw materials, the ability to absorb industrial waste, low energy consumption and cost, and the largest and most versatile building materials that can be used in combination with steel bars. However, due to its low ultimate tensile rate, it is easy to shrink and crack under the effects of drying shrinkage, creep, temperature, etc., resulting in leakage of concrete engineering and corrosion of steel bars, which seriously affects the durability of structures. Shrinkage-compensating concrete prepared with expansion agent is one of the effective technical approaches to solve shrinkage cracking of concrete materials. [0003] It is an important measure to prevent the shrinkage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/04
Inventor 陆安群田倩张守治王瑞李华姚婷
Owner JIANGSU SOBUTE NEW MATERIALS
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