Preparation method for early-strength agent for concrete

An early strength agent and concrete technology, which is applied in the field of concrete additive preparation, can solve the problems of slow hardening time, limited strength improvement, and lack of plastic retention performance, and achieve the effects of improving performance, increasing strength, and accelerating hardening time

Active Publication Date: 2017-10-20
攀枝花市润泽建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a preparation method of concrete early-strength agent in view of the current existing concrete early-strength agent that can only increase the strength of concrete at different ages, and has the defects of lack of plastic retention and slow hardening time.

Method used

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  • Preparation method for early-strength agent for concrete

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preparation example Construction

[0022] The preparation method of concrete early strength agent of the present invention, comprises the steps:

[0023] (1) Put cellulose, acetamide and water into the container according to the mass ratio of 4~6:3:8, stir at 150r / min for 10~15min, use sodium hydroxide solution to adjust the pH to 8.0~8.5, at 80 Insulate at ~85℃ for 1~2h;

[0024] (2) After the heat preservation is over, add bromooctadecane with 30-35% cellulose mass, stir evenly, cool down to 60-65°C, let stand for 3-6 hours, filter the mixture in the container while it is hot, and collect The filter residue is washed with water until the washing solution becomes neutral, the washed filter residue is collected, and the washed filter residue is air-dried to collect the air-dried matter;

[0025] (3) According to the mass ratio of 1:3~5, put the air-dried matter and tetrahydrofuran into the reactor, use nitrogen protection, and add 10-15% of the air-dried matter's n-butyllithium dropwise at -80~-75°C , control...

example 1

[0029] The preparation method of concrete early strength agent of the present invention, comprises the steps:

[0030] (1) Put cellulose, acetamide and water into a container at a mass ratio of 4:3:8, stir at 150r / min for 10min, adjust the pH to 8.0 with sodium hydroxide solution, and keep warm at 80°C for 1h;

[0031] (2) After the heat preservation is over, add bromooctadecane with 30% cellulose mass, stir evenly, cool down to 60°C, let it stand for 3 hours, filter the mixture in the container while it is hot, collect the filter residue, and wash the filter residue with water Until the washing solution becomes neutral, collect the washed filter residue, air-dry the washed filter residue, and collect the air-dried matter;

[0032] (3) According to the mass ratio of 1:3, put the air-dried matter and tetrahydrofuran into the reactor, use nitrogen protection, and add 10% n-butyl lithium dropwise at -80°C, and control the dropping time for 1h , then dropwise add dimethylformamid...

example 2

[0034] The preparation method of concrete early strength agent of the present invention, comprises the steps:

[0035] (1) Put cellulose, acetamide and water into a container at a mass ratio of 5:3:8, stir at 150r / min for 13min, adjust the pH to 8.3 with sodium hydroxide solution, and keep warm at 83°C for 1h;

[0036] (2) After the heat preservation is over, add bromooctadecane with 33% cellulose mass, stir evenly, cool down to 63°C, let it stand for 5 hours, filter the mixture in the container while it is hot, collect the filter residue, and wash the filter residue with water Until the washing solution becomes neutral, collect the washed filter residue, air-dry the washed filter residue, and collect the air-dried matter;

[0037] (3) According to the mass ratio of 1:4, put the air-dried matter and tetrahydrofuran into the reactor, use nitrogen protection, and add n-butyllithium with 13% air-dried matter at -78°C dropwise, and control the dropping time to 1h , then dropwise ...

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Abstract

The invention belongs to the technical field of concrete additive preparation, and particularly relates to a preparation method for an early-strength agent for concrete. According to the preparation method, cellulose, acetamide and water are first uniformly mixed, sodium hydroxide solution is used for regulating pH, temperature is then kept for reaction, bromooctadecane is then added, mixing and filtration are carried out, filter residue is collected, washed and air-dried, afterwards the air-dried matter is collected to react with tetrahydrofuran, n-butyllithium and dimethylformamide, discharge is carried out, the collected discharged matter and Gamma-aminopropyltriethoxysilane are then uniformly mixed and distilled, finally distilled residue, nano-titanium dioxide and aluminium silicate are mixed, the stirred mixture is collected, and thereby the early-strength agent for concrete is obtained. The early-strength agent obtained by the invention can effectively increase the strength of concrete at each age, and can also effectively shorten concrete hardening time, and in addition, the plasticity-maintaining property is good as well.

Description

technical field [0001] The invention belongs to the technical field of concrete additive preparation, and in particular relates to a preparation method of concrete early strength agent. Background technique [0002] Concrete is one of the most widely used building materials in construction engineering, but due to different application environments, the performance requirements of concrete are different. The probability of cracks caused by temperature stress, and some emergency repair projects require concrete to set quickly and gain strength to meet the needs of emergency repairs. [0003] Patent application number CN200510037161.9 discloses a cement early strength agent and its preparation method. It is composed of ferrous sulfate, industrial salt, fly ash and calcium carbonate powder. When adding 3 to 5‰ to cement, It can promote the early strength of cement up to 20.9MPa in 3 days. But on the one hand, the early strength improvement in this technical solution is not lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42
Inventor 李兴才王磊潘宏梅
Owner 攀枝花市润泽建材有限公司
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