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A kind of responsive concrete antifreeze agent and its preparation method and application

A technology of concrete and antifreeze, which is applied in the direction of applying stable tension/pressure to test the strength of materials, instruments, and analysis materials. It can solve the problems of negative impact on mechanical properties, many limiting factors in use, and complicated construction. The effect of simplicity, fewer restrictions on use, and easy construction

Active Publication Date: 2021-12-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of these measures has many restrictive factors, the construction is complicated, and it has a negative impact on the mechanical properties, so the application is greatly restricted.

Method used

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  • A kind of responsive concrete antifreeze agent and its preparation method and application
  • A kind of responsive concrete antifreeze agent and its preparation method and application
  • A kind of responsive concrete antifreeze agent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A responsive concrete antifreeze agent, the main raw materials are carboxylated chitosan, hydroxyethyl cellulose, chitin, polyvinyl alcohol, urea and sodium hydroxide, as shown in Table 1 below:

[0037] Table 1 Reagents used in the test

[0038]

[0039] According to the proportioning design of antifreeze, the former solution obtains the following table 2:

[0040] Table 2 Ratio design of antifreeze original solution

[0041]

[0042] Above-mentioned cellulose / chitosan former solution and PVA / chitin former solution are uniformly mixed, can make antifreeze, select two formulas (mass ratio) of preparation antifreeze, as shown in table 3:

[0043] Table 3 Antifreeze ratio

[0044]

[0045]Raw materials used to prepare ordinary concrete: P.O 42.5 ordinary Portland cement; natural river sand, medium sand with a fineness modulus of 2.7, and all indicators meet the requirements of the "Sand for Construction" (GB / T14684-2011) standard specification; The pebbles wit...

Embodiment 2

[0062] A kind of responsive concrete antifreeze, its preparation method comprises the following steps:

[0063] 1) adding NaOH and urea to water to obtain NaOH / urea solution;

[0064] 2) Add hydroxyethyl cellulose and carboxylated chitosan to NaOH / urea solution to obtain cellulose / chitosan solution; add polyvinyl alcohol and chitin to NaOH / urea solution to obtain polyvinyl alcohol / chitin solution;

[0065] 3) Mix the cellulose / chitosan solution with the polyvinyl alcohol / chitin solution evenly and remove air bubbles to obtain the responsive concrete antifreeze agent.

[0066] In step 1), in the NaOH / urea solution, the solvent is water, the mass percentage of NaOH is 1%, and the mass percentage of urea is 5%.

[0067] In step 2), the preparation process of the cellulose / chitosan solution is as follows: adding hydroxyethyl cellulose to the NaOH / urea solution at 35°C and stirring, then adding carboxylated chitosan and ultrasonically dispersing , followed by freezing and thawi...

Embodiment 3

[0078] A kind of responsive concrete antifreeze, its preparation method comprises the following steps:

[0079] 1) adding NaOH and urea to water to obtain NaOH / urea solution;

[0080] 2) Add hydroxyethyl cellulose and carboxylated chitosan to NaOH / urea solution to obtain cellulose / chitosan solution; add polyvinyl alcohol and chitin to NaOH / urea solution to obtain polyvinyl alcohol / chitin solution;

[0081] 3) Mix the cellulose / chitosan solution with the polyvinyl alcohol / chitin solution evenly and remove air bubbles to obtain the responsive concrete antifreeze agent.

[0082] In step 1), in the NaOH / urea solution, the solvent is water, the mass percentage of NaOH is 3%, and the mass percentage of urea is 3%.

[0083] In step 2), the preparation process of the cellulose / chitosan solution is as follows: adding hydroxyethyl cellulose to the NaOH / urea solution at 45°C and stirring, then adding carboxylated chitosan and ultrasonically dispersing , followed by freezing and thawi...

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Abstract

The invention relates to a responsive concrete antifreeze agent and its preparation method and application. The preparation method of the antifreeze agent comprises the following steps: 1) adding NaOH and urea to water to obtain NaOH / urea solution; 2) adding hydroxyethyl Add cellulose and carboxylated chitosan to NaOH / urea solution to obtain cellulose / chitosan solution; add polyvinyl alcohol and chitin to NaOH / urea solution to obtain polyvinyl alcohol / chitin solution; 3 ) Mix the cellulose / chitosan solution with the polyvinyl alcohol / chitin solution evenly and remove the air bubbles to obtain the responsive concrete antifreeze; during application, add the responsive concrete antifreeze to the concrete mixture, The dosage of the responsive concrete antifreeze agent is 2-10% of the mass of the cementitious material. Compared with the prior art, the invention can effectively reduce the freeze-thaw damage of the concrete and improve the service life of the concrete material under the condition of temperature alternation.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a responsive concrete antifreeze agent and a preparation method and application thereof. Background technique [0002] Concrete freeze-thaw damage refers to the destruction of the performance and appearance integrity of concrete materials under the action of freeze-thaw cycles. The frost resistance of concrete is one of the important indicators of concrete durability. Under the action of low-temperature freeze-thaw cycles, the internal structure of concrete will be damaged, and the durability will be reduced. The quality of the overall project will be greatly affected, and the life and performance of the project will be greatly affected. Significantly lower. [0003] The process of concrete freeze-thaw damage is a complex physical change process. At present, most studies believe that the frost resistance of concrete is related to the moisture in the pores and micro-crac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38G01N3/18C04B103/60
CPCC04B40/0046C04B2103/601G01N3/18G01N2203/0224C04B24/383C04B24/38C04B22/062C04B24/126C04B24/2623
Inventor 吴凯韩好龙江峰徐玲琳孙丹丹杨正宏
Owner TONGJI UNIV
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