CN112175129A - Concrete workability regulator and preparation method thereof - Google Patents
Concrete workability regulator and preparation method thereof Download PDFInfo
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- CN112175129A CN112175129A CN202011039393.9A CN202011039393A CN112175129A CN 112175129 A CN112175129 A CN 112175129A CN 202011039393 A CN202011039393 A CN 202011039393A CN 112175129 A CN112175129 A CN 112175129A
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- concrete
- concrete workability
- workability regulator
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
- C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
- C04B24/163—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F4/00—Polymerisation catalysts
- C08F4/40—Redox systems
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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention discloses a concrete workability regulator and a preparation method thereof, and the preparation method comprises the following steps: adding acrylic acid, maleic anhydride, propanesulfonic acid and allyl phosphate into a reaction container, exhausting air, and heating to 10-40 ℃; adding an initiator to react for 1-2 hours to obtain the workability regulator. The raw materials are as follows by mass percent: 25-50% of acrylic acid, 5-30% of maleic anhydride, 1-10% of propanesulfonic acid and 1-30% of allyl phosphate. The obtained concrete workability regulator can instantly generate a large amount of anions when added into concrete, can occupy adsorption points on cement particles, can be balanced with cations in the atmosphere, and can effectively improve the cohesiveness of the concrete through the special physical magnetic field effect. Meanwhile, the raw material cost is low, the reaction condition is mild, no additional reaction solvent is required, the environment is friendly, and the method is suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a concrete workability regulator and a preparation method thereof.
Background
Compared with the traditional concrete, the modern concrete has the changes of low water-cement ratio design, multi-component active admixture doping, multi-component compound high-efficiency admixture addition and the like, the raw materials of the concrete are changed more and more, and the powder is characterized in that: the fineness of cement and admixture is larger and larger, a large amount of chemical substances are left after desulfurization and denitrification of the fly ash, and the quality of substitute materials (limestone powder, composite powder and the like) is uneven; aggregate aspect: due to the fact that river sand and machine-made sand with poor fineness and gradation are generally applied due to resource exhaustion, the large water reducing rate is pursued on the aspect of the admixture, and due to changes, the concrete is extremely sensitive to the yield of the admixture and is easy to separate and bleed.
The workability regulators currently used can be roughly divided into three groups according to the source: (1) natural organic macromolecular compounds: xanthan gum, welan gum, cellulose, starch, and the like; (2) modified natural organic macromolecular compound: modified polysaccharide compounds, modified cellulose, and the like; (3) artificially synthesizing a high molecular compound: polyacrylamide, polyvinyl alcohol, polyacrylic acid-acrylamide, and the like. (1) (2) the viscosity is rapidly reduced due to the electrolyte effect in the application process of the concrete; (3) the viscosity of the concrete is easily increased, and the slump and the expansion degree are easily reduced.
Disclosure of Invention
The invention aims to provide a novel concrete workability regulator and a preparation method thereof, the obtained workability regulator can instantly generate a large amount of anions when added into concrete, then the cations in the atmosphere are promoted to generate a natural equilibrium state, the cohesiveness of the concrete can be effectively improved by the special physical magnetic field effect, the cost of the related raw materials is low, the reaction condition is mild, no additional reaction solvent is required to be added, and the concrete workability regulator is environment-friendly and suitable for popularization and application.
In order to achieve the purpose, the technical scheme is as follows:
a concrete workability modifier having the following structural formula:
in the formula, R1，R2Selected from alkyl with 1-3 carbon atoms; r3is-H or-CH3。
The preparation method of the concrete workability regulator comprises the following steps:
adding acrylic acid, maleic anhydride, propanesulfonic acid and allyl phosphate into a reaction container, exhausting air, and heating to 10-40 ℃; adding an initiator to react for 1-2 hours to obtain the workability regulator.
According to the scheme, the raw materials comprise the following components in percentage by mass: 25-50% of acrylic acid, 5-30% of maleic anhydride, 1-10% of propanesulfonic acid and 1-30% of allyl phosphate.
According to the scheme, the initiator consists of an oxidant component and a reducing agent component, wherein the oxidant component is organic peroxide, and the reducing agent component is an aromatic tertiary amine compound; wherein the amount of the initiator is 0.1-1 wt% of the total amount of the monomers.
According to the scheme, the organic peroxide is dibenzoyl peroxide; the aromatic tertiary amine compound is N, N-dimethylaniline, N-dimethyl-p-phenylmethylamine or a homologue.
According to the scheme, the weight average molecular weight of the obtained concrete workability regulator is 8000-10000.
According to the scheme, the solid content of the obtained concrete workability regulator is 100%.
According to the scheme, the mixing amount of the obtained concrete workability regulator in the concrete is 0.5g/m3～2.0g/m3。
The chemical reaction formula for preparing the concrete workability regulator is as follows:
the concrete workability regulator obtained by the invention can instantly generate a large amount of anions when added into concrete, can occupy adsorption points on cement particles, can be balanced with cations in the atmosphere, and can effectively improve the cohesiveness of the concrete through the special physical magnetic field effect. Meanwhile, the raw materials involved in the method are low in cost, the reaction conditions are mild, no additional reaction solvent is required to be added, and the method is environment-friendly and suitable for popularization and application.
The traditional substance action mechanism for improving the concrete workability is that adjacent molecule side chains of the workability regulator attract each other to cause the formation and entanglement of a gel network structure, thereby preventing the migration of free water, increasing the viscosity of the whole system, and causing the great influence on the working state of the concrete.
Compared with the prior art, the invention has the beneficial effects that:
1) when the concrete workability regulator is added, aggregate in the concrete is in a suspension state, so that segregation and bleeding can be effectively reduced, and the sensitivity of the polycarboxylic acid water reducing agent is reduced.
2) The concrete workability regulator of the invention has small dosage and good economical efficiency.
3) The concrete workability regulator of the invention does not increase the viscosity of the concrete and has no adverse effect on the working performance of fresh concrete and the mechanical performance and durability of hardened concrete.
4) The method has the advantages of low cost of raw materials, mild reaction conditions, no need of adding additional reaction solvent, environmental friendliness and suitability for popularization and application.
Detailed Description
In order to better understand the present invention, the following embodiments are further illustrated, but the present invention is not limited to the following embodiments.
Example 1
A concrete workability regulator is prepared by using acrylic acid, maleic anhydride, propanesulfonic acid and allyl phosphate as main raw materials and performing bulk polymerization under the action of an initiator, and comprises the following specific steps:
weighing 50g of acrylic acid, 20g of maleic anhydride, 10g of propanesulfonic acid and 20g of allyl phosphate, adding into a reaction kettle, uniformly stirring, exhausting air, and heating to 40 ℃; 0.24g of dibenzoyl peroxide (BPO) and 0.1g of N, N-Dimethylaniline (DMA) are weighed and added into a reaction kettle, and the temperature is kept at 40 ℃ for reaction for 1 hour to obtain the workability regulator HY-01.
The weight average molecular weight of the product obtained in the example and the workability modifier HY-01 was 9201, which was determined by gel permeation chromatography.
Example 2
A concrete workability regulator is prepared by using acrylic acid, maleic anhydride, propanesulfonic acid and allyl phosphate as main raw materials and performing bulk polymerization under the action of an initiator, and comprises the following specific steps:
weighing 50g of acrylic acid, 30g of maleic anhydride, 8g of propanesulfonic acid and 12g of allyl phosphate, adding into a reaction kettle, uniformly stirring, exhausting air, and heating to 10 ℃; weighing 0.24g of dibenzoyl peroxide (BPO) and 0.1g of N, N-dimethyl-p-toluidine (DMT), adding into a reaction kettle, and continuously stirring; keeping the temperature at 10 ℃ for 2 hours to obtain the workability regulator HY-02.
The weight average molecular weight of the product obtained in the example and the workability modifier HY-02 was 8750 as determined by gel permeation chromatography.
Example 3
A concrete workability regulator is prepared by using acrylic acid, maleic anhydride, propanesulfonic acid and allyl phosphate as main raw materials and performing bulk polymerization under the action of an initiator, and comprises the following specific steps:
weighing 30g of acrylic acid, 30g of maleic anhydride, 10g of propanesulfonic acid and 30g of allyl phosphate, adding into a reaction kettle, uniformly stirring, exhausting air, and heating to 25 ℃; weighing 0.35g of dibenzoyl peroxide (BPO) and 0.15g of N, N-Dimethylaniline (DMA), adding into a reaction kettle, and continuously stirring; keeping the temperature at 25 ℃ for reaction for 1.5 hours to obtain the workability regulator HY-03.
The product obtained in this example and the workability modifier HY-03 was determined by gel permeation chromatography and had a weight average molecular weight of 9860.
Application example
The workability regulator prepared in the embodiments 1-3 of the invention is applied to the preparation of concrete, the commercial common warm wheel rubber (comparative example 1), polyacrylamide (comparative example 2) and modified cellulose (comparative example 3) are adopted in the comparative examples, the prepared concrete is respectively subjected to working performance and mechanical performance tests, and the test method refers to GB/T50080-2016 (Standard for testing the Performance of the mixture of common concrete) and GB/T50081-2019 (Standard for testing the mechanical Performance of the common concrete). The concrete collapse method is adopted to measure the concrete viscosity: inverting the slump bucket, filling the slump bucket with concrete and leveling, quickly lifting the slump bucket about 40cm, measuring the concrete emptying time by using a stopwatch, calculating the mixing amount according to the concrete consumption of each side, and obtaining a test result shown in table 1.
The concrete consists of a cementing material, machine-made sand, coarse aggregate and water, wherein the content of the cementing material is 600kg/m3(including cement and fly ash, wherein the dosage of the cement is 500kg/m3100kg/m of fly ash3Cement is Huaxin P. O42.5R, fly ash is I-grade ash), the machine-made sand content is 780kg/m3(fineness modulus of 2.8) and coarse aggregate content of 910kg/m3(5-20 continuous grading basalt) and the water-glue ratio is 0.25.
TABLE 1 working Performance test results for concrete
As can be seen from the table 1, when the workability regulator prepared in the embodiments 1 to 3 of the invention is applied to the common C70 concrete, the mixing amount can be reduced in different degrees, and collapse experiments show that the collapse time of the workability regulator prepared in the invention is shortened by 50 to 75 percent, and the viscosity reduction effect is obvious; meanwhile, the bleeding rate is obviously reduced.
The invention can be realized by the raw materials and the upper and lower limit values and interval values thereof, and the invention can be realized by the lower limit values and interval values of the process parameters (such as temperature, time and the like), and the examples are not listed. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and changes can be made without departing from the inventive concept of the present invention, and these modifications and changes are within the protection scope of the present invention.
Claims (8)
1. A concrete workability modifier characterized by the following structural formula:
in the formula, R1，R2Selected from alkyl with 1-3 carbon atoms; r3is-H or-CH3。
2. A method for preparing the concrete workability regulator according to claim 1, characterized by comprising the steps of:
adding acrylic acid, maleic anhydride, propanesulfonic acid and allyl phosphate into a reaction container, exhausting air, and heating to 10-40 ℃; adding an initiator to react for 1-2 hours to obtain the workability regulator.
3. The preparation method of the concrete workability regulator as claimed in claim 2, characterized in that the raw materials are, in mass percent: 25-50% of acrylic acid, 5-30% of maleic anhydride, 1-10% of propanesulfonic acid and 1-30% of allyl phosphate.
4. A method of preparing a concrete workability regulator according to claim 2, characterized in that the initiator consists of an oxidizing agent component which is an organic peroxide and a reducing agent component which is an aromatic tertiary amine compound; wherein the amount of the initiator is 0.1-1 wt% of the total amount of the monomers.
5. A method for preparing a concrete workability regulator according to claim 2, characterized in that the organic peroxide is dibenzoyl peroxide; the aromatic tertiary amine compound is N, N-dimethylaniline, N-dimethyl-p-phenylmethylamine or a homologue.
6. The method for preparing a concrete workability modifier according to claim 2, wherein the weight-average molecular weight of the concrete workability modifier is 8000 to 10000.
7. A method for preparing a concrete workability regulator according to claim 2, characterized in that the concrete workability regulator obtained has a solids content of 100%.
8. The method for preparing the concrete workability regulator according to claim 2, wherein the concrete workability regulator is added to the concrete in an amount of 0.5g/m3～2.0g/m3。
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| CN202011039393.9A CN112175129A (en) | 2020-09-28 | 2020-09-28 | Concrete workability regulator and preparation method thereof |
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| CN202011039393.9A CN112175129A (en) | 2020-09-28 | 2020-09-28 | Concrete workability regulator and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108373524A (en) * | 2018-03-23 | 2018-08-07 | 刘翠芬 | High-adaptability type polycarboxylate water-reducer pulvis and its bulk polymerization preparation method |
| CN108484842A (en) * | 2018-05-03 | 2018-09-04 | 科之杰新材料集团有限公司 | Low responsive type polycarboxylate water-reducer of a kind of esters and preparation method thereof |
| WO2019100372A1 (en) * | 2017-11-27 | 2019-05-31 | 科之杰新材料集团有限公司 | Rapid low-temperature preparation method for mixing amount low sensitive polycarboxylic acid |
-
2020
- 2020-09-28 CN CN202011039393.9A patent/CN112175129A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019100372A1 (en) * | 2017-11-27 | 2019-05-31 | 科之杰新材料集团有限公司 | Rapid low-temperature preparation method for mixing amount low sensitive polycarboxylic acid |
| CN108373524A (en) * | 2018-03-23 | 2018-08-07 | 刘翠芬 | High-adaptability type polycarboxylate water-reducer pulvis and its bulk polymerization preparation method |
| CN108484842A (en) * | 2018-05-03 | 2018-09-04 | 科之杰新材料集团有限公司 | Low responsive type polycarboxylate water-reducer of a kind of esters and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 曲烈等: "《预拌砂浆生产与工程应用》", 30 November 2018, 北京：中国建材工业出版社 * |
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Application publication date: 20210105 |