Special additive for inhibiting concrete alkali-aggregate reaction

A technology of alkali aggregate and admixture, which is applied in the field of concrete admixture, can solve the problems of high price and difficult promotion, and achieve the effects of prolonging service life, great social benefits and improving durability

Inactive Publication Date: 2012-07-18
刘福战
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AI Technical Summary

Problems solved by technology

[0006] Although foreign countries have successfully developed chemical admixtures to inhibit the alkali-aggregate reaction, only lithium salts have been developed, which are expensive and difficult to promote

Method used

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Embodiment Construction

[0013] A special admixture for inhibiting concrete alkali-aggregate reaction, with active fine powder as the carrier, adopts air-entraining (lignin sulfonate), water-resistance (stearate), water-reducing (lignin), early strength ( Nitrate) and other multi-component composite technologies. The cost of the admixture is much lower than that of foreign lithium salt admixtures.

[0014] Economic benefit analysis of admixture

[0015] 1. Material cost of admixture

[0016] The material cost of the admixture used to inhibit the concrete alkali-aggregate reaction is 1219.60 yuan per ton. To build an admixture factory with an annual output of 5000 tons of inhibitors, the price per ton is 3000 yuan, and the profit per ton is 1000 yuan. The agent production plant can make a profit of 5 million yuan a year for only one type of inhibitor.

[0017] 2. For a large-scale key project, if the concrete consumption is 20,000 cubic meters, 300-400 tons of concrete alkali-aggregate reaction inhi...

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Abstract

The invention relates to a concrete additive, particularly to a special additive for inhibiting a concrete alkali-aggregate reaction. Active fine powder is used as a carrier, and the multiple compounding technologies such as air entraining (lignosulfonate), water resistance (stearate), water reduction (lignin), early strengthening (nitrate) and the like are adopted. The cost of the additive is greatly lower than that of the foreign lithium salt additive. The doping amount of the inhibitor is 2-4% of cement aiming at high, medium and low activities of aggregate under different alkali content conditions, and the inhibitor has good inhibitory effect. The higher the activity of the aggregate alkali is, the more obvious the inhibitory effect is. The higher the content of concrete alkali is, the more obvious the inhibitory effect is. After the inhibitor is added into concrete, the overall performance is increased, the workability is improved, the slump loss is reduced, 28d strength is increased, the durability such as freezing resistance, seepage resistance and the like is increased, the harms of steel bar corrosion and the like do not occur, the service life of concrete is prolonged, the use safety of concrete is ensured, and the social benefit is great.

Description

[0001] technical field [0002] The invention relates to a concrete admixture, in particular to a special admixture for inhibiting concrete alkali-aggregate reaction. Background technique [0003] Durability is an important performance index of concrete, which is related to the service life and safety of concrete engineering. The alkali-aggregate reaction is caused by the destructive expansion reaction between the sand and stone aggregate in the concrete and the alkali in the system, resulting in the cracking and failure of the concrete structure. Moreover, because the damage of this reaction lasts for a long time and is irreparable, many scientists in the world call it the "cancer" of concrete. Since the destructive factor was discovered in the 1940s, it has caused a large number of engineering damages and huge losses. A series of projects in my country from the 1980s to the early 1990s also caused serious losses due to the damage of the alkali-aggregate reaction, such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/18
Inventor 刘福战蒋宝祥李志峰孙洪全查广利于国松
Owner 刘福战
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