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Additive for increasing cement-base material solidifying dissociative chlorine ion capability and applying method thereof

A technology of cement-based materials and admixtures, applied in the direction of solid waste management, climate sustainability, sustainable waste treatment, etc., can solve limited problems, achieve the effect of improved performance, good compatibility, and low price

Inactive Publication Date: 2008-08-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ability of cement-based materials to solidify chloride ions after being mixed with fly ash and slag is still very limited.

Method used

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  • Additive for increasing cement-base material solidifying dissociative chlorine ion capability and applying method thereof
  • Additive for increasing cement-base material solidifying dissociative chlorine ion capability and applying method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The admixture is a mixture of silicon-aluminum oxide-containing minerals (finely granulated blast furnace slag) and crystalline calcium nitrite, and the mass ratio between the two is 8:1.

[0027] The above-mentioned admixture equivalent to 25% of the cement mass is added to the cement, and the mixing, production and maintenance of the cement-based material mixed with the admixture are all the same as ordinary cement-based materials (concrete).

[0028] The performance test is: Compared with pure cement materials, the performance of solidified chloride ions is increased by 97%.

Embodiment 2

[0030] The admixture is a mixture of silicon-aluminum oxide-containing minerals (finely granulated blast furnace slag) and crystalline calcium nitrite, and the mass ratio between the two is 8:1.

[0031] The above-mentioned admixture equivalent to 35% of the cement mass is added to the cement, and the mixing, production and maintenance of the cement-based material mixed with the admixture are all the same as ordinary cement-based materials (concrete).

[0032] The performance test is: compared with pure cement materials, the performance of solidified chloride ions is increased by 103%.

Embodiment 3

[0034]The admixture is a mixture of silicon-aluminum oxide-containing minerals (finely granulated blast furnace slag) and crystalline calcium nitrite, and the mass ratio between the two is 9:1.

[0035] The above-mentioned admixture equivalent to 30% of the cement mass is added to the cement, and the mixing, production and maintenance of the cement-based material mixed with the admixture are all the same as ordinary cement-based materials (concrete).

[0036] The performance test is: compared with pure cement materials, the performance of solidified chloride ions is increased by 110%.

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Abstract

The present invention discloses an additive which increases the performance of the solidifying free chloride ion cement-based material and the using method thereof, the additive comprises silicon-aluminum oxide material and nitrite, and the mass ratio between the silicon-aluminum oxide and the nitrite is 8-9:1. The mixing amount of the additive in the cement base material is 25%-35%, when the additive is mixed into the capacity of the system for solidifying chlorine ion can be remarkably increased, and the capacity for solidifying the chlorine ion by the cement-based material can be increased by 100%; and other capability of the cement-based material can be improved. When the additive is mixed the single cube price of the cement-based material can be reduced, the cost performance is high and the application is easy.

Description

technical field [0001] The invention relates to an admixture for improving the ability of cement-based materials to solidify free chloride ions and improving the anti-corrosion performance of steel bars in concrete structures under chloride-salt environments. Background technique [0002] The durability of concrete structures has attracted widespread attention from all over the world. Among them, the corrosion of steel bars induced by free chloride ions is an important factor affecting the durability of concrete structures, and the annual loss is difficult to measure. [1] ([1] Jin Weiliang, Zhao Yuxi, Durability of Concrete Structures [M], Beijing: Science Press, 2002.9). Therefore, effectively controlling the content of free chloride ions in concrete is one of the important ways to improve the corrosion resistance of steel bars in concrete structures, which has important scientific value and practical significance. [0003] Typically, chloride ions exist in concrete in thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/00
CPCC04B40/0039Y02W30/91C04B18/08C04B18/141C04B22/085C04B28/02C04B18/146
Inventor 龙广成谢友均余志武
Owner CENT SOUTH UNIV
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