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Expansive material for cement or concrete and preparation thereof

An expansion agent and concrete technology, applied in the field of preparation of the expansion agent, can solve the problems of large limited expansion rate, high compressive and flexural strength, etc., and achieve the effects of saving energy, saving land and reducing pollution

Active Publication Date: 2008-08-27
冀东海德堡(泾阳)水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide an expansion agent for cement or concrete, which is directly produced from industrial waste slag magnesium slag, and solves the problem of a large amount of accumulation of magnesium slag. The expansion agent has a large Limited expansion, high compressive and flexural strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 82g of magnesium slag (CaO+MgO content is 59%), 10g of dihydrate gypsum, 5g of secondary fly ash, 3g of sodium sulfate, mix and grind (specific surface area 300~600m 2 / kg) made into cement concrete expansion agent, tested according to the national standard, when the dosage is 10% of the cement mass, the limit expansion rate of curing in water for 7 days is 0.19%, the limit expansion rate of curing in water for 28 days is 0.07%, and curing in air The 21-day limit expansion rate is 0.074%, the 7-day compressive strength is 33.7MPa, the 28-day compressive strength is 48.5MPa, the 7-day flexural strength is 8.3MPa, and the 28-day flexural strength is 9.2MPa, in line with "Concrete Expansive Agent" JC476-2001 standard requirement.

Embodiment 2

[0024] Weigh 90g of magnesium slag (CaO+MgO content is 65%), 10g of dihydrate gypsum, mix and grind (specific surface area 300~600m 2 / kg) made into cement concrete expansion agent, tested according to the national standard, when the dosage is 12% of the cement mass, the limit expansion rate of curing in water for 7 days is 0.11%, the limit expansion rate of curing in water for 28 days is 0.06%, and the limit expansion rate of curing in air is 0.06%. The 21-day limit expansion rate is 0.015%, the 7-day compressive strength is 33.6MPa, the 28-day compressive strength is 45.4MPa, the 7-day flexural strength is 7.8MPa, and the 28-day flexural strength is 8.1MPa, in line with "Concrete Expansive Agent" JC476-2001 standard requirement.

Embodiment 3

[0026] Weigh 75g of magnesium slag (CaO+MgO content is 57%), 15g of dihydrate gypsum, 7g of secondary fly ash, 3g of sodium sulfate, mix and grind (specific surface area 300~600m 2 / kg) made into cement concrete expansion agent, tested according to the national standard, when the dosage is 10% of the cement mass, the limit expansion rate is 0.09% for 7 days in water curing, 0.01% for 28 days in water curing, and 0.01% for curing in air. The 21-day limit expansion rate is 0.004%, the 7-day compressive strength is 31.2MPa, the 28-day compressive strength is 45.7MPa, the 7-day flexural strength is 6.7MPa, and the 28-day flexural strength is 7.6MPa, in line with "Concrete Expansive Agent" JC476-2001 standard requirement.

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Abstract

The invention discloses an expansion agent for cement or concrete, the weight percentages of the components contents of the expansion agent are that magnesium slag takes 70-95%, gypsum takes 5-15%, fly ash takes 0-20%, and additive agent takes 0-5%. The expansion agent is produced by industrial residue and the magnesium slag, which solves the problem that the magnesium slag is accumulated in quantities. The expansion agent has relatively high limited expansion rate, high compression strength and high breaking strength. The invention discloses a process for preparing the expansion agent, the magnesium slag, the gypsum, the fly ash and the additive agent are mixed and grinded in proportion, wherein the magnesium slag contains CaO and MgO and the content is larger than 50%, specific surface area achieves 300-600m2 / kg, and the expansion agent is prepared without calcining by the process.

Description

technical field [0001] The invention relates to the field of cement or concrete expansion agent. The invention can be used in engineering fields such as cement grouting, waterproof concrete, mass concrete, road concrete, expansive concrete and shrinkage compensation concrete. The invention also relates to a preparation method of the expansion agent. Background technique [0002] Metal magnesium is widely used in automobile industry, precision machinery industry, structural materials, electrochemical industry and space technology. In recent years, the rapid development of the magnesium industry has also produced a large amount of industrial waste. About 9 tons of magnesium slag are discharged for every 1 ton of metal magnesium produced. At present, the annual discharge of magnesium slag in my country is nearly one million tons, and with the development of magnesium smelting industry, its discharge will increase year by year. [0003] There is no good way to utilize magnes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14
CPCC04B28/14Y02W30/91C04B18/08C04B18/144C04B22/143C04B22/124
Inventor 南峰伍勇华
Owner 冀东海德堡(泾阳)水泥有限公司
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