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High-activity shrinkage-compensating mineral admixture and preparation method thereof

A mineral admixture, a technology for compensating shrinkage, which is applied in the field of highly active mineral admixture and its preparation, can solve the problems of reducing water consumption, easy cracking, and large shrinkage of concrete, and achieves the effect of improving impermeability.

Active Publication Date: 2007-02-14
WUHAN MUNICIPAL CONSTR GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing mineral admixtures such as slag, silica fume, zeolite powder, phosphorus slag, metakaolin, fly ash, and coal gangue have high activity, but the concrete prepared by using it shrinks greatly and is easy to crack; while using steel slag ore Although powder-prepared concrete has the effect of compensating shrinkage, its utilization rate is relatively low due to its low activity.
At the same time, as far as mineral admixtures are concerned, they only play the role of fillers, pozzolanic activity, and water consumption reduction in cement concrete, and are far from being able to achieve the function of compensating shrinkage for concrete.

Method used

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  • High-activity shrinkage-compensating mineral admixture and preparation method thereof

Examples

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example 1

[0022] Example 1: high activity compensation shrinkage mineral admixture, it is mixed by steel slag, slag, sulphoaluminate cement clinker and gypsum, and its each component mass percentage is: steel slag: slag: sulphoaluminate cement clinker : Gypsum=40%: 40%: 15%: 5%.

[0023] The preparation method of the above-mentioned highly active shrinkage compensation mineral admixture comprises the following steps: 1). According to the mass percentage of each component: steel slag: slag: sulphoaluminate cement clinker: gypsum=40%: 40%: 15% : 5%, select steel slag, slag, sulphoaluminate cement clinker and gypsum; 2). Grind each raw material separately until the specific surface area is 400-500m 2 / kg, then mixed evenly, and finally packaged, sealed and sealed.

[0024] The activity index and expansion index of the high-activity shrinkage compensation mineral admixture can respectively reach: activity index ≥ 80% (strength ratio); 28d expansion rate: 0.03-0.05%; 180d expansion rate: 0....

example 2

[0026] Example 2: high activity compensation shrinkage mineral admixture, it is mixed by steel slag, slag, sulphoaluminate cement clinker and gypsum, and its each component mass percent is: steel slag: slag: sulphoaluminate cement clinker : Gypsum=45%: 35%: 14%: 6%.

[0027] The preparation method of the above-mentioned high-activity shrinkage-compensating mineral admixture comprises the following steps: 1). According to the mass percentage of each component: steel slag: slag: sulphoaluminate cement clinker: gypsum=45%: 35%: 14% : 6%, select steel slag, slag, sulphoaluminate cement clinker and gypsum; 2). Grind each raw material separately until the specific surface area is 200m 2 / kg, then mix and grind the mixture to a specific surface area of ​​400-500m 2 / kg, and finally packed, sealed and sealed.

[0028] The activity index and expansion index of the high-activity shrinkage compensation mineral admixture can respectively reach: activity index ≥ 80% (strength ratio); 28d...

example 3

[0029] Example 3: high activity compensation shrinkage mineral admixture, it is mixed by steel slag, slag, sulphoaluminate cement clinker and gypsum, and its each component mass percentage is: steel slag: slag: sulphoaluminate cement clinker : Gypsum=46%: 30%: 18%: 6%.

[0030] The preparation method of the above-mentioned high-activity shrinkage-compensating mineral admixture comprises the following steps: 1). According to the mass percentage of each component: steel slag: slag: sulphoaluminate cement clinker: gypsum=46%: 30%: 18% : 6%, select steel slag, slag, sulphoaluminate cement clinker and gypsum; 2). Crush various raw materials to a diameter of less than 50mm, then mix them, and grind the mixture to a specific surface area of ​​400-500m 2 / kg, and finally packed, sealed and sealed.

[0031] The activity index and expansion index of the high-activity shrinkage compensation mineral admixture can respectively reach: activity index ≥ 80% (strength ratio); 28d expansion ra...

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Abstract

The invention provides a high-activity shrinkage-compensating mineral admixture having compensation and contraction action to cement concrete, the material is prepared by mixing steel slag, mineral slag, sulfoaluminate cement chamotte and gypsum by the mass proportion of steel slag : mineral slag : sulfoaluminate cement chamotte : gypsum=40-60% : 20-40% : 10-20% : 5-10%, the sum of each of the compositions is 100%.

Description

technical field [0001] The invention belongs to the category of inorganic non-metallic materials, in particular to a highly active mineral admixture capable of compensating shrinkage for cement concrete and a preparation method thereof. Background technique [0002] The application of mineral admixtures in cement concrete not only improves the additional utilization value of industrial waste, protects the environment, and reduces the cost of concrete, but also greatly improves the traditional performance of cement concrete and prolongs its service life. However, existing mineral admixtures such as slag, silica fume, zeolite powder, phosphorus slag, metakaolin, fly ash, and coal gangue have high activity, but the concrete prepared by using it shrinks greatly and is easy to crack; while using steel slag ore Although powder-prepared concrete has the function of compensating shrinkage, its utilization rate is relatively low due to its low activity. At the same time, for mineral...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/00C04B22/14
Inventor 胡曙光丁庆军王红喜吕林女何永佳彭波王发洲陈平
Owner WUHAN MUNICIPAL CONSTR GROUP