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Additive for improving early strength of cement based material as well as preparation method and application of additive

A cement-based material and early-strength technology, applied in the field of concrete admixtures, can solve problems such as limited early-strength effects

Active Publication Date: 2015-05-27
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Purpose of the invention: In order to overcome the above-mentioned deficiencies in the prior art, aiming at the urgent demand for improving the early strength of current cement-based materials and the problem that the existing early-strength admixture has limited early-strength effect in cement-based materials under low temperature environment, the present invention The purpose of the present invention is to provide an admixture for improving the early strength of cement-based materials and a preparation method thereof. The admixture prepared by the method can not only effectively improve the early strength of cement-based materials, but also has a high water-reducing rate and adaptability to cement. stability without affecting the later strength and durability of cement-based materials

Method used

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  • Additive for improving early strength of cement based material as well as preparation method and application of additive
  • Additive for improving early strength of cement based material as well as preparation method and application of additive
  • Additive for improving early strength of cement based material as well as preparation method and application of additive

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Add 40g of distilled water, 62.3g of polyether macromonomer c-1 and 5.37g of 30% hydrogen peroxide into a 2L glass round-bottomed flask equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen conduit, and stir to raise the temperature dissolve. Under nitrogen protection, the temperature in the flask was maintained to 5°C, and then 8.22g monomer a-1, 9.22g monomer b-1, 0.41g 3-mercaptopropionic acid, 0.34g sodium formaldehyde sulfoxylate and 80g Distilled water was mixed and stirred to make a uniform monomer aqueous solution, which was added dropwise to a round bottom flask at a constant speed for 1 hour; at the same time, 0.92 g of monomer d-1 was added dropwise at a constant speed for 1 hour. , to maintain the pH of the system at 6-7. After the aqueous monomer solution is added dropwise, M w = 50345 ionic polymer, then add 1411.5g of distilled water at 60°C to the flask at one time, raise the temperature to 60°C, then add 282.3g of triethoxysilane dr...

Embodiment 2

[0053]Into a 2L glass round-bottomed flask equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen gas conduit, add 20 g of distilled water and 92.6 g of polyether macromonomer c-2, stir and heat up to dissolve. Under the protection of nitrogen, the temperature in the flask was maintained to 35°C, and then 29.26g of monomer a-2, 0.95g of monomer b-2, 0.14g of thioglycolic acid, 0.51g of sodium bisulfite and 30g of distilled water were mixed and stirred to prepare Uniform monomer aqueous solution, drop it into the round bottom flask at a constant speed, the dropping time is 0.5h; add 3.45g monomer d-2 dropwise at a constant speed, the dropping time is 0.5h; Sodium sulfate and 34g of distilled water are mixed to form an aqueous initiator solution, and the dropwise addition time is 40 minutes. During the dropwise addition, the pH value of the system is maintained at 6-7. After the aqueous solution of the initiator is added dropwise, M is obtained w = 76408 ionic...

Embodiment 3

[0055] Into a 2L glass round-bottomed flask equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen gas conduit, add 37g of distilled water and 84.2g of polyether macromonomer c-3, stir and heat up to dissolve. Under the protection of nitrogen, the temperature in the flask was maintained to 20°C, and then 37.35g of monomer a-3, 3.26g of monomer b-3, 1.10g of 2-mercaptopropionic acid, 2.86g of sodium sulfite and 50g of distilled water were mixed and stirred to prepare Uniform monomer aqueous solution, drop it into the round bottom flask at a constant speed, the dropping time is 2h; add 3.07g monomer d-3 dropwise at a constant speed, the dropping time is 2h; at the same time add 1.02g potassium persulfate The initiator aqueous solution mixed with 40g of distilled water is added dropwise for 125 minutes, and the pH of the system is maintained at 6-7 during the dropwise addition. After the aqueous solution of the initiator is added dropwise, M is obtained w = 798...

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Abstract

The invention provides an additive for improving early strength of a cement based material. The additive is prepared by the reaction of an ionic copolymer and silane, wherein the ionic copolymer is prepared by the reaction of a monomer A, a monomer B, a monomer C and a monomer D. The invention further provides a preparation method of the additive for improving early strength of the cement based material and application of the additive in improvement of the early strength of the cement based material. The additive is simple in preparation process, convenient to use, low in cost and relatively high in water reduction rate, accelerates the hydration of the cement in the early stage, improves the early strength of the cement based material, particularly shows an obvious effect on improving the early strength of the cement based material at a low temperature environment, is relatively high in adaptability to the raw materials, has a good super early strength improving effect for different cement, and does not have any adverse effect on the future strength and durability.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to an admixture for improving the early strength of cement-based materials and a preparation method thereof. Background technique [0002] The scale and quantity of high-speed railways, subways and tunnels, large bridges, hydropower projects, high-rise buildings, wind power and other major infrastructure projects under construction in China rank first in the world, providing a huge market space for the application of cement-based materials super early strength technology . Ballastless track slabs used in high-speed rail construction require concrete 16h compressive strength greater than 48MPa; concrete shield segments used in subway and tunnel construction even require 10h release strength greater than 20MPa; Steel cylinder concrete water pipes (PCCP), static pressure high-strength prestressed (PHC) pipe piles above C80 for high-rise building construction, large prefabr...

Claims

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Application Information

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IPC IPC(8): C04B24/42
Inventor 杨勇冉千平刘加平刘浩舒鑫张建纲
Owner JIANGSU SOBUTE NEW MATERIALS
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