A kind of modified calcium oxide type expanded clinker, its preparation method and its 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 calcium oxide type expanded clinker, such as weathering resistance, poor moisture resistance, weak shrinkage compensation ability, and fast hydration speed, and achieves social and economic benefits. Significant benefits, easy access, long shelf life results

Active Publication Date: 2017-06-20
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 speed of the calcium oxide expansion clinker is fast, the early expansion is rapid, the contraction compensation ability in the middle and late stages is weak, and the calcium oxide expansion clinker has poor weathering resistance and moisture resistance, etc., the present invention provides A phosphorylated surface-coated modified calcium oxide expansion clinker

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Preparation of phosphorylated-coated modified calcium oxide expanded clinker (using commercially available calcium oxide expanded clinker as raw material)

[0040]Grinding and crushing the commercially available CaO-based expansion clinker into a specific surface area of ​​330m 2 / kg of powder. Weigh 500.0g of CaO expansion clinker and put it into a 1000ml three-necked round-bottomed flask filled with absolute ethanol. A polytetrafluoroethylene stirrer was installed in the middle of the three-neck round bottom flask. Slowly add phosphoric acid liquid with a concentration of 85% into one side port of the three-neck flask. The stirrer stirs the CaO clinker at 100r / min. Through physical adsorption and chemical reaction, a large amount of dense calcium phosphate is formed on the surface of CaO-based expanded clinker powder. Then filter and dry the modified calcium oxide expanded clinker at 55-60° C. to separate the phosphorylated coated modified calcium oxide expand...

Embodiment 2

[0055] (1) Preparation of phosphate-coated modified calcium oxide expansion agent (using 9 commercially available calcium oxide concrete expansion agents as raw materials)

[0056] Phosphorylated surface treatment was carried out on 9 commercially available calcium oxide concrete expansion agents. Weigh 200.0g of calcium oxide expansion agent and put it into a 1000ml three-necked round-bottomed flask filled with absolute ethanol. A polytetrafluoroethylene stirrer was installed in the middle of the three-neck round bottom flask. Slowly add phosphoric acid liquid with a concentration of 85% into one side port of the three-neck flask. Except for the above, the phosphoric acid treatment process is carried out in the same manner as in Example 1. By controlling the amount of phosphoric acid liquid added, the calcium phosphate wrapping amount of the expansion agent is controlled to be 4.0%. The reaction temperature is controlled at 20-50°C.

[0057] Table 4 shows the chemical com...

Embodiment 3

[0067] (1) Preparation of phosphorylated-coated modified calcium oxide expanded clinker (using commercially available calcium oxide expanded clinker as raw material)

[0068] Weigh 2.00kg of commercially available unground CaO expansion clinker, mix it with a phosphoric acid solution with a concentration of 85%, and grind it together in a ball mill to a fineness of about 350m 2 / kg of powder. During the grinding process, phosphoric acid reacts with calcium oxide expanded clinker powder to form a large amount of dense calcium phosphate on the surface of the expanded material.

[0069] Table 6 shows the chemical composition (wt.%) of the commercially available calcium oxide expanded clinker.

[0070]

[0071] Table 7 is phosphoric acid (H 3 PO 4 ) Grinding process parameters of surface treated CaO expanded clinker.

[0072]

[0073] Note: The amount of calcium phosphate coating is the generated Ca 3 (PO 4 ) 2 Accounting for the mass ratio of modified calcium oxide e...

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Abstract

The invention relates to a modified calcium oxide expansion clinker as well as a preparation method and application thereof. The preparation method of the modified calcium oxide expansion clinker comprises the following steps: carrying out physical adsorption and chemical reaction on calcium oxide expansion clinker powder in phosphoric acid which serves as a solvent, or mixing a calcium oxide expansion clinker with phosphoric acid and grinding the mixture into powder of a certain finesses, and forming a large number of compact calcium phosphate on the surface of the calcium oxide expansion clinker powder to obtain the modified calcium oxide expansion clinker. The modified calcium oxide expansion clinker can be mixed with a dispersible carrier to form a modified calcium oxide concrete expansion agent. By adopting the phosphorylated coated modified calcium oxide expansion clinker and the modified calcium oxide concrete expansion agent, the expansion quantity and expansion stress of an expansion material in cement concrete can be increased significantly, the expansion process of the modified calcium oxide expansion clinker and the modified calcium oxide concrete expansion agent can be optimized, and the weather resistance and moisture resistance of the modified calcium oxide expansion clinker and the modified calcium oxide concrete expansion agent can be enhanced.

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 the most widely used building material. Cracks have always been a key factor affecting the durability of concrete and its structures, and the shrinkage of concrete is the direct cause of concrete cracking. The early drying shrinkage and temperature drop shrinkage of concrete will bring challenges to the usability and stability of concrete structures. Therefore, improving the crack resistance of concrete has always been a research hotspot. [0003] Compensating the shrinkage of cement-based materials by using the volume expansion produced by the expansive components during the hydration process is an important measure to reduce shrinkage and cracking of concrete and improve the stability of concrete struct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/06
Inventor 陆安群田倩张守治程骏李司晨王伟
Owner JIANGSU SOBUTE NEW MATERIALS
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