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Cement early-strength admixture and preparation method thereof

A technology for early strength agent and cement, which is applied in the field of cement early strength agent and its preparation to achieve the effect of saving resources and being beneficial to sustainable development

Active Publication Date: 2015-11-25
WASHI CEMENT GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention does not contain organic matter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Put 351g of calcium carbide slag, 310g of bauxite and 339g of desulfurized gypsum into a planetary mill, add 420g of water, and grind for 5 hours. After taking it out, pour the slurry into a mold, and demould after molding to obtain a block sample;

[0025] Put the above sample in a digital display constant temperature stirring circulation curing box that has been heated to a set temperature of 95°C, take it out and cool it after constant temperature curing for 15 hours;

[0026] After the cooled block sample is crushed, it is placed in a high-temperature furnace and calcined at 1000°C for 60 minutes. After taking it out, it is rapidly cooled and ground by a ball mill until the specific surface area is 390m 2 / kg to get cement early strength agent. The obtained cement accelerator, after testing, contains anhydrous calcium sulfoaluminate and monocalcium aluminate;

[0027] Add 3% of the above-mentioned early strength agent to P·I Portland cement (42.5), the initial sett...

Embodiment 2

[0029] Put 467g steel slag, 255g bauxite and 278g desulfurized gypsum into a planetary mill, add 375g water, grind for 4 hours, take it out, pour the slurry into the mold, demould after molding, and obtain a block sample;

[0030] Put the above sample in a digital display constant temperature stirring circulation curing box that has been heated to a set temperature of 85°C, take it out and cool it after constant temperature curing for 21 hours;

[0031] After the cooled block sample is crushed, it is placed in a high-temperature furnace, calcined at 860°C for 100 minutes, taken out, cooled rapidly, and ground by a ball mill until the specific surface area is 370m 2 / kg to get cement early strength agent. The obtained cement accelerator, after testing, contains anhydrous calcium sulfoaluminate and monocalcium aluminate;

[0032] Add 5% of the above-mentioned early strength agent to P·I Portland cement (42.5), the initial setting time is 130min, and the strength of 3d mortar re...

Embodiment 3

[0034] Put 413g of sugar filter mud, 234g of bauxite and 353g of phosphogypsum into a planetary mill, add 335g of water, and grind for 7 hours. After taking it out, pour the slurry into a mold, and demould after molding to obtain a block sample ;

[0035] Put the above sample in a digital display constant temperature stirring circulation curing box that has been heated to a set temperature of 75°C, take it out and cool it after constant temperature curing for 18 hours;

[0036] After the cooled block sample is crushed, it is placed in a high-temperature furnace and calcined at 920°C for 80 minutes. After taking it out, it is rapidly cooled and ground by a ball mill until the specific surface area is 350m 2 / kg to get cement early strength agent. The obtained cement accelerator, after testing, contains anhydrous calcium sulfoaluminate and monocalcium aluminate;

[0037] Add 4% of the above-mentioned early strength agent to P·I Portland cement (42.5), the initial setting time ...

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PUM

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Abstract

The invention discloses a cement early-strength admixture which contains 34-58% of anhydrous calcium sulphoaluminate and 42-66% of monocalcium aluminate. The cement early-strength admixture is free of organic matters. The preparation method comprises the following steps: uniformly mixing calcic waste, bauxite and desulfurized gypsum, adding water (the water-to-cement ratio is 0.3-0.42), grinding for 4-7 hours, pouring the slurry into a mold, forming, and demolding to obtain a sample; and carrying out isothermal curing on the sample at 65-95 DEG C for 15-24 hours, cooling, crushing, calcining at 800-1000 DEG C for 60-120 minutes, taking out, quenching, and milling to obtain the cement early-strength admixture. The early-strength admixture prepared by the method provided by the invention has the advantages of early strength and setting acceleration, and does not need to add any organic matter which is harmful to the human body.

Description

technical field [0001] The invention relates to the technical field of cement admixture preparation, in particular to a cement early strength agent and a preparation method thereof. Background technique [0002] Early strength agent is one of the admixtures of cement and cement-based materials. It refers to the admixture that can improve the early strength of cement and cement-based products, and has no significant effect on the later strength. The main function of the early strength agent is to accelerate the hydration speed of cement and promote the development of the early strength of the product; it not only has the function of early strength, but also has the function of water reduction and enhancement. However, the existing cement early strength agents on the market are complex in preparation process, consume a lot of energy, and adding more organic matter is harmful to the human body, and cannot meet the needs of sustainable development and early strength and fast se...

Claims

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Application Information

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IPC IPC(8): C04B22/14
Inventor 郭伟王春
Owner WASHI CEMENT GRP CO LTD
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