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Modified limestone powder-based mineral admixture and preparation method thereof

A mineral admixture and limestone powder technology, applied in the field of mineral admixtures, can solve the problems of difficulty in increasing the amount of limestone powder, restricting the application of limestone powder, and limiting the wide application, etc., achieving simple and feasible preparation methods and reducing the diffusion of chloride ions The coefficient, the effect of simple preparation process

Inactive Publication Date: 2012-09-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to increase the amount of limestone powder in cement concrete, which limits its wide application and slows the growth of concrete strength in the later stage, which further restricts the application of limestone powder in cement concrete.

Method used

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  • Modified limestone powder-based mineral admixture and preparation method thereof
  • Modified limestone powder-based mineral admixture and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The Blaine specific surface area is 350m 2 50 parts / kg of limestone powder, Blaine's specific surface area is 400m 2 50 parts / kg of slag powder, Blaine specific surface area 450m 2 4 parts per kg of calcined gypsum and 0.02 parts of triethanolamine are mechanically stirred, and the modified limestone powder-based mineral admixture is made after mixing evenly, wherein: slag powder is the molten slag discharged when smelting pig iron, and the 7-day activity index is not less than 75%, dry powder with an activity index of not less than 95% in 28 days, calcined gypsum is calcined by gypsum at a temperature of 850, CaSO 4 Dry powder with a content greater than 85%.

[0021] Use this mineral admixture to prepare concrete, and the mix ratio and properties are shown in Table 1 and Table 2.

[0022] The raw materials used are: 42.5 ordinary Portland cement is used for cement, river sand with a fineness modulus of 2.6, gravel is continuously graded crushed stone of 5-25mm, and...

Embodiment 2

[0028] The Blaine specific surface area is 350m 2 60 parts / kg of limestone powder, Blaine's specific surface area is 400m 2 / kg of slag powder 40 parts, Blaine specific surface area 450m 2 4 parts per kg of calcined gypsum and 0.03 parts of triethanolamine are mechanically stirred, mixed evenly to make a modified limestone powder-based mineral admixture, wherein: slag powder is the molten slag discharged when smelting pig iron, and the 7-day activity index is not less than 75%, dry powder with an activity index of not less than 95% in 28 days, calcined gypsum is calcined by gypsum at a temperature of 780, CaSO 4 Dry powder with a content greater than 85%.

Embodiment 3

[0030] The Blaine specific surface area is 350m 2 70 parts / kg of limestone powder, Blaine's specific surface area is 400m 2 / kg of slag powder 30 parts, Blaine specific surface area 450m 2 5 parts per kg of calcined gypsum and 0.03 parts of triethanolamine are mechanically stirred, and mixed evenly to make a modified limestone powder-based mineral admixture, wherein: slag powder is the molten slag discharged when smelting pig iron, and the activity index in 7 days is not less than 75%, 28-day activity index of not less than 95% dry powder, calcined gypsum is calcined by gypsum at 750°C, CaSO 4 Dry powder with a content greater than 85%.

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Abstract

The invention discloses a modified limestone powder-based mineral admixture and a preparation method thereof. The modified limestone powder-based mineral admixture includes, by weight, from 50 to 70 parts of limestone powder, from 30 to 50 parts of mineral waste residue powder, from 3 to 5 parts of calcined gypsum and from 0.01 to 0.03 part of triethanolamine which are used for preparing the modified limestone powder-based mineral admixture by means of stirring and mixing. The modified limestone powder-based mineral admixture has high activity, the strength and the durability of cement concrete can be obviously increased, the mixing amount of the limestone powder in the cement concrete can be increased, cost is reduced, and the modified limestone powder-based mineral admixture has remarkable economic and social benefits.

Description

technical field [0001] The invention relates to a mineral admixture, in particular to a modified limestone powder-based mineral admixture, and also relates to a preparation method of the modified limestone powder-based mineral admixture. Background technique [0002] Limestone is a kind of calcite (CaCO 3 ) are composed of minerals, which are rich in natural resources, widely distributed and easy to obtain. As raw materials for cement production and coarse and fine aggregates for concrete, a large amount of limestone powder is inevitably produced in the process of mining limestone and producing machine-made sand and stone. If it is discarded, it will cause huge environmental pollution and increase environmental load. , occupying land. Therefore, if limestone powder can be used as an admixture to reduce the amount of cement, improve the performance and strength of concrete mixture, and improve the durability of concrete, this will not only make up for the scarcity and short...

Claims

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Application Information

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IPC IPC(8): C04B22/14C04B14/28C04B18/12
CPCY02W30/91
Inventor 肖佳许彩云董荣珍成丹陈嘉奇
Owner CENT SOUTH UNIV
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