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

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0050] Example 1

[0051] In a 2L glass round bottom flask equipped with a thermometer, stirrer, dropping funnel and nitrogen conduit, add 40g distilled water, 62.3g polyether macromonomer c-1 and 5.37g 30% hydrogen peroxide, stir and raise Dissolve. Under the protection of nitrogen, the temperature in the flask was maintained to 5℃, 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, and it was dropped into a round-bottom flask at a constant speed, and the dropping time was 1h; at the same time, 0.92g of monomer d-1 was dropped at a constant speed, and the dropping time was 1h. , Maintain the pH of the system at 6-7. After the monomer aqueous solution is added dropwise, M w =50345 ionic polymer, and then add 1411.5g of distilled water at 60°C into the flask at one time, raise the temperature to 60°C, and then add 282.3g of t...

Example Embodiment

[0052] Example 2

[0053] In a 2L glass round bottom flask equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen conduit, 20 g of distilled water and 92.6 g of polyether macromonomer c-2 were added, and the mixture was stirred and heated to dissolve. Under the protection of nitrogen, maintain the temperature in the flask to 35℃, then mix and stir 29.26g monomer a-2, 0.95g monomer b-2, 0.14g thioglycolic acid, 0.51g sodium bisulfite and 30g distilled water. Uniform monomer aqueous solution, drop it into a round bottom flask at a constant speed, the dropping time is 0.5h; 3.45g monomer d-2 is dropped at a constant speed, the dropping time is 0.5h; at the same time, the dropping time is over 0.13g The initiator aqueous solution mixed with sodium sulfate and 34g of distilled water, the dripping time is 40min, and the pH of the system is maintained at 6-7 during the dripping process. After the initiator aqueous solution is added dropwise, M w = 76408 ionic polymer,...

Example Embodiment

[0054] Example 3

[0055] In a 2L glass round bottom flask equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen conduit, 37 g of distilled water and 84.2 g of polyether macromonomer c-3 were added, and the mixture was stirred and heated to dissolve. Under the protection of nitrogen, maintain the temperature in the flask to 20°C, then mix and stir 37.35g monomer a-3, 3.26g monomer b-3, 1.10g 2-mercaptopropionic acid, 2.86g sodium sulfite and 50g distilled water. Uniform monomer aqueous solution, drop it into the round bottom flask at a constant speed, the dripping time is 2h; at a constant speed add 3.07g monomer d-3, the dripping time is 2h; at the same time, add 1.02g potassium persulfate at a constant speed The initiator aqueous solution mixed with 40g of distilled water, the dripping time is 125min, and the pH value of the system is maintained at 6-7 during the dripping process. After the initiator aqueous solution is added dropwise, M w = 79860 ionic poly...

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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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