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A kind of concrete workability modifier and preparation method thereof

A conditioner and concrete technology, applied in the field of concrete, can solve problems such as inconvenient construction, excessive air content in concrete, poor cohesion of concrete, etc., and achieve the effect of improving poor cohesion and workability

Active Publication Date: 2021-05-25
CHINA TIESIJU CIVIL ENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the large-scale construction of concrete construction projects across the country, the demand for concrete has increased suddenly, and the environmental protection has increased in recent years. The particle gradation of sand is poor, there are many fine particles, and the mud content is large, and the cohesion of the mixed concrete is not good, loose and easy to segregate, which is not convenient for construction; on the other hand, with the promotion of energy conservation and environmental protection, minerals in cement There are more and more types of admixtures, and the adaptability of polycarboxylate superplasticizers to cement is also particularly prominent.
[0003] In response to the above problems, those skilled in the art are also constantly researching countermeasures, such as using thickeners, air-entraining agents, etc. to improve the workability of concrete, but the problem cannot be completely solved during use.
Because commonly used thickeners such as cellulose, wenlun gum, and rubber powder are not compatible with polycarboxylate water reducers due to their own solubility; and there are many types of air-entraining agents, and the dosage is small, and air bubbles will be introduced when used improperly. The size is not easy to control, and the air content of concrete exceeds the standard, etc.

Method used

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  • A kind of concrete workability modifier and preparation method thereof
  • A kind of concrete workability modifier and preparation method thereof
  • A kind of concrete workability modifier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Under normal temperature (no external heating source) condition, in the four-neck flask of 2L, add the molecular weight of 600g after TPEG of 2000 and the tap water of 600g are stirred to dissolve, then add the thiourea dioxide of 1.02g, stir until the material in the flask dissolves; Simultaneously Add liquid A and liquid B that have been prepared dropwise, add liquid A dropwise for 2.5 hours, add liquid B dropwise for 3 hours, and the reaction will naturally heat up. After the temperature at the end of the dropwise addition is kept for 1 hour, add 40wt% sodium hydroxide to neutralize until the pH is 6-8, to obtain the concrete workability regulator.

[0033] Among them, liquid A is prepared by dissolving 32.4g of acrylic acid, 10.66g of acrylamide, and 3.1g of 2-acrylamide-2-methylpropanesulfonic acid in 120g of water, and liquid B is prepared by dissolving 1.5g of potassium dichromate in 100g of water. made.

Embodiment 2

[0035] At normal temperature (without external heating source), add 600g of TPEG with a molecular weight of 2400, 4.8g of vinyl acetate and 600g of tap water into a 2L four-necked flask and stir to dissolve, then add 4.02g of urea and stir into the flask The material is dissolved, and the prepared liquid A and liquid B are added dropwise to the kettle at the same time. The liquid A is added dropwise for 2.5 hours, and the liquid B is added dropwise for 3 hours. Sodium oxide is neutralized to a pH of 6-8 to obtain the concrete workability regulator;

[0036] Liquid A is prepared by dissolving 55g of acrylic acid, 5.33g of acrylamide, and 20g of 2-acrylamide-2-methylpropanesulfonic acid in 120g of water, and liquid B is prepared by dissolving 3g of potassium permanganate in 100g of water.

Embodiment 3

[0038] Under normal temperature (no external heating source) condition, in the four-necked flask of 2L, add the TPEG that the molecular weight of 600g is 4000, the hydroxyethyl acrylate of 4.8g and the running water of 600g stir and dissolve, add the thiourea of ​​2.5g, stir until The material in the flask is dissolved, and the prepared liquid A and liquid B are added dropwise to the kettle at the same time. The liquid A is added dropwise for 2.5 hours, and the liquid B is added dropwise for 3 hours. % sodium hydroxide is neutralized to pH 6-8 to obtain the concrete workability regulator;

[0039] Among them, liquid A is prepared by dissolving 37.9g ​​methacrylic acid, 28.62g itaconic acid, 7.5g N-methylolacrylamide, 1.6g sodium p-styrene sulfonate in 120g water, and liquid B is 3.7g permanganese It is prepared by dissolving potassium acid in 100g of water.

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Abstract

The invention discloses a concrete workability regulator and a preparation method thereof, which comprises the following components: an unsaturated polyether macromonomer, an unsaturated ester monomer, a chain transfer agent, a strong oxidant, and a hydrophilic modifier ; Wherein the molar ratio of unsaturated polyether macromer, unsaturated ester monomer and hydrophilic modifier is 0.5~1.5:0~0.2:1.65~5.3; the addition amount of described chain transfer agent, strong oxidizing agent is respectively Accounting for 0.17~0.67% and 0.25~1% of the mass of unsaturated polyether macromonomer; the chain transfer agent is a reducing chain transfer agent, and the strong oxidant is potassium permanganate, potassium dichromate at least one. The invention utilizes a chain transfer agent with weak reducing property and a strong oxidant to polymerize under the condition of no external heating source to prepare a concrete workability regulator, which has a larger molecular weight, has the function of thickening and water retention, improves the workability of concrete and It will not cause the air content of concrete to exceed the standard.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a concrete workability regulator and a preparation method thereof. Background technique [0002] Polycarboxylate high-performance water reducer is widely used in various industries due to its advantages of low dosage, high water reducing rate, low slump loss, low shrinkage, no environmental pollution in the production process and designability of the product itself. It is also the most active high-performance superplasticizer researched at home and abroad in recent years. However, with the large-scale construction of concrete construction projects across the country, the demand for concrete has increased suddenly, and the environmental protection has increased in recent years. The particle gradation of sand is poor, there are many fine particles, and the mud content is large, and the cohesion of the mixed concrete is not good, loose and easy to segregate, which is n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/56C08F220/58C04B24/26
Inventor 汪志勇林春红陈娟黄海温建峰李双超汪春满訾贺李芳芳李双许立
Owner CHINA TIESIJU CIVIL ENG GRP CO LTD