CN112920347A - Preparation method of C70-based high-strength concrete crushed pebble and crushed stone concrete admixture - Google Patents

Preparation method of C70-based high-strength concrete crushed pebble and crushed stone concrete admixture Download PDF

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CN112920347A
CN112920347A CN202110373181.2A CN202110373181A CN112920347A CN 112920347 A CN112920347 A CN 112920347A CN 202110373181 A CN202110373181 A CN 202110373181A CN 112920347 A CN112920347 A CN 112920347A
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concrete
admixture
crushed
strength
crushed stone
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Inventor
魏伟
米婷婷
苗晓红
秦坤
景维富
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Gansu Construction Investment Commercial Concrete Co ltd
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Gansu Construction Investment Commercial Concrete Co ltd
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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
    • C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
    • C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
    • C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
    • 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
    • C04B24/165—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds containing polyether side chains
    • 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
    • C04B24/24—Macromolecular compounds
    • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/2641—Polyacrylates; Polymethacrylates
    • C04B24/2647—Polyacrylates; Polymethacrylates containing polyether side chains
    • 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
    • C04B24/24—Macromolecular compounds
    • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/2688—Copolymers containing at least three different monomers
    • C04B24/2694—Copolymers containing at least three different monomers containing polyether side chains
    • 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

Abstract

The invention discloses a preparation method of a C70-based high-strength concrete crushed pebble and crushed stone concrete admixture, which comprises the following steps: adding unsaturated polyoxyethylene ether macromonomer and water into a reaction kettle at the temperature of 25-30 ℃ in a mass ratio of 1:3, and stirring; after uniformly stirring, simultaneously dripping a material A and a material B, wherein the material A is a mixed aqueous solution of unsaturated anhydride or carboxylic acid, a reducing agent and a chain transfer agent for 3-3.5 h; the material B is an oxidant aqueous solution, and is dripped for 2 to 2.5 hours; after the curing is finished, adding sodium hydroxide solution, adjusting the pH value to 5-7, and obtaining the concrete polycarboxylic acid admixture with the solid content of 40-45%. The C70-based high-strength concrete crushed pebble and crushed stone concrete admixture is free of heating in the preparation process, energy is saved, pollution is reduced, the admixture is good in performance, and the concrete crushed pebble and crushed stone concrete admixture is applied to the preparation process and contributes to improving the compressive strength of concrete.

Description

Preparation method of C70-based high-strength concrete crushed pebble and crushed stone concrete admixture
Technical Field
The invention relates to the technical field of concrete preparation, in particular to a preparation method of a C70-based high-strength concrete gravel and gravel concrete admixture.
Background
With the continuous development of the world building industry, the average strength of concrete is greatly improved in the construction process, which provides higher requirements for the performance of the admixture and provides conditions for development. The additive reduces the unit water consumption in concrete construction, improves the strength of the fluid concrete, thereby improving the construction efficiency and quality, and the function of the additive can be developed towards high reinforcement and fluidization. In the development process of the polycarboxylic acid admixture, the polycarboxylic acid admixture is an admixture which reaches the standard of railway concrete use due to the superiority of the polycarboxylic acid admixture, and the requirements on the quality and performance of concrete are higher and higher along with the continuous development of construction in China, so that the polycarboxylic acid admixture is inevitably developed in the market.
The use of the admixture is a development direction of various concretes, and the vigorous development and popularization of the concrete admixture can promote the concrete preparation process and the development of novel concrete and also is an important way for promoting the scientific progress of the construction industry. With the continuous development and increase of the variety of concrete admixtures, the quality can be gradually improved, the application can be increasingly wide, the research can be deeper, and the concrete admixtures can play great roles and good benefits in the construction industry. No toxic gas is discharged into the atmosphere in the production of the polycarboxylic acid admixture, no pollution is caused, and the polycarboxylic acid admixture has remarkable social benefit.
The problems generally existing in the industry at present are that various additives are various and influence on the additives and concrete is not different. In the actual production process, due to the factors of various cement varieties, more mud in concrete aggregate and the like, the problems of poor adaptability of the admixture and the cement, poor concrete workability, large concrete slump loss and the like often occur, and the construction requirements of actual engineering are difficult to meet.
Disclosure of Invention
The invention aims to provide a preparation method of a C70-based high-strength concrete crushed pebble and crushed stone concrete admixture, which aims to solve the problems that the existing admixture has poor adaptability to cement, poor concrete workability, large concrete slump loss and difficulty in meeting the construction requirements of actual engineering in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of a C70-based high-strength concrete crushed pebble and crushed stone concrete admixture comprises the following steps:
step one, adding an unsaturated polyoxyethylene ether macromonomer and water into a reaction kettle at a mass ratio of 1:3 at a temperature of 25-30 ℃, and stirring;
step two, after stirring uniformly, simultaneously dripping a material A and a material B, wherein the material A is a mixed aqueous solution of unsaturated anhydride or carboxylic acid, a reducing agent and a chain transfer agent, and the dripping time is 3-3.5 hours; the material B is an oxidant aqueous solution, and is dripped for 2 to 2.5 hours;
and step three, after the dropwise addition and the curing are finished for 1 hour, adding a sodium hydroxide solution, and adjusting the pH value to 5-7 to obtain the concrete polycarboxylic acid admixture with the solid content of 40-45%.
Preferably, in the first step, the unsaturated polyoxyethylene ether macromonomer has the saturation degree of not more than 0.37 and the molecular weight of 2400;
preferably, the aqueous solution of the oxidant in the second step is at least one of ammonium persulfate, potassium persulfate and permanganic acid;
preferably, the reducing agent in the second step is at least one of VC, ferrous sulfate, oxalic acid, and sodium thiosulfate.
Preferably, in the second step, the temperature of the material A and the material B is accurately controlled in the dripping process, and the temperature is measured every half hour, so that the temperature is stably increased, and the phenomenon that the copolymerization phenomenon is generated due to too fast temperature rise and the performance of the mother solution is influenced is avoided.
Compared with the prior art, the invention has the beneficial effects that: the C70-based high-strength concrete crushed pebble and crushed stone concrete admixture is free of heating in the preparation process, energy is saved, pollution is reduced, the admixture is good in performance, and the concrete crushing and mixing additive is applied to the preparation process of crushed pebbles and crushed stone concrete, contributes to improving the compressive strength of concrete, and can provide a basis for future high-strength concrete trial-production.
Drawings
FIG. 1 is a flow chart of the preparation of the high-strength concrete gravel and gravel concrete admixture based on C70 according to the present invention;
FIG. 2 is a graph showing the change of compressive strength of the admixture of example 2 in 7 days in the course of application to C70-based high-strength concrete crushed gravel and crushed gravel concrete;
FIG. 3 is a graph showing the change of 28-day compressive strength of the admixture of example 2 of the present invention applied to the crushed pebbles and crushed stone concrete of C70-based high-strength concrete during the preparation process;
FIG. 4 is a graph showing the comparison of the strength representative values of the admixture of example 2 of the present invention applied to the crushed pebbles of C70-based high-strength concrete and the crushed pebble concrete in the course of 7 days and 28 days.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, a method for preparing a high-strength concrete crushed pebble and crushed stone concrete admixture based on C70 comprises the following steps: 360 g of methacrylic polyoxyethylene ether having a molecular weight of 2400 and 270 g of water were put into a four-necked flask and stirred for 20 minutes. A solution A was obtained by dissolving 43 g of acrylic acid, 1.6 g of mercaptopropionic acid and 0.66 g of VC in 86 g of water. 4.42 grams of hydrogen peroxide and 52 grams of water were mixed to give a B solution. And (3) the material A is added for three hours, the material B is added for 2.5 hours, heating is not needed in the dripping process, the material B is cured for 1 hour after dripping, and water is added to adjust the concentration to 40 percent, so that the concrete polycarboxylic acid additive is obtained.
Example 2
Referring to fig. 1, a method for preparing a high-strength concrete crushed pebble and crushed stone concrete admixture based on C70 comprises the following steps: putting 360 g of prenyl polyoxyethylene ether into a reaction kettle, adding a mixed solution consisting of 5.8 g of acrylic acid, 0.23 g of ammonium persulfate and 180 g of water, and stirring until the bottom materials are completely dissolved. After the bottom material is dissolved, a solution consisting of 3.4 g of hydrogen peroxide and 15 g of water is added, and after uniform stirring, a solution consisting of an AB material, 26.6 g of acrylic acid, 19.5 g of hydroxypropyl acrylate and 85 g of tap water is added dropwise. The material B is a solution consisting of 1 g of VC, 8.3 g of sodium methallyl sulfonate, 0.8 g of zinc chloride and 165 g of water. And (3) finishing adding the material A for 3 hours and finishing adding the material B for 3.5 hours, continuing to react for one hour after adding the material B, adding water to dilute until the solid content is 40 percent, and neutralizing with a sodium hydroxide solution until the pH value is 6 to obtain the concrete polycarboxylic acid admixture.
Example 3
Referring to fig. 1, a method for preparing a high-strength concrete crushed pebble and crushed stone concrete admixture based on C70 comprises the following steps: 240 g of prenyl polyoxyethylene ether is put into a reaction kettle, 277 g of tap water is added, and the mixture is stirred until the prenyl polyoxyethylene ether is completely dissolved. After the dissolution of the base material, a solution of 1.35 g of 30% hydrogen peroxide and 15 g of water was added. The material A is a solution composed of 18 g of acrylic acid, 23.2 g of hydroxypropyl acrylate and 52 g of water. Material B was a solution consisting of 0.62 g VC, 1.06 g mercaptopropionic acid and 82 g water. Material A for 2.5 hours and material B for 3 hours. A. And after the material B is added, continuously reacting for 1 hour, and then adding sodium hydroxide to neutralize to PH6-7 to obtain the concrete polycarboxylic acid admixture.
The concrete admixture prepared in example 1 was examined and the examination results are shown in Table 1.
TABLE 1
Figure BDA0003010098060000041
Figure BDA0003010098060000051
The admixture prepared in example 2 is applied to the crushed cobbles and crushed stone concrete prepared based on C70 high-strength concrete, the number is 1, and the specific mixing ratio and the material use condition are shown in Table 2.
TABLE 2 trial mix ratio and material consumption (kg/m)3)
Figure BDA0003010098060000052
Figure BDA0003010098060000061
FIG. 2(a) shows the 7-day compressive strength, FIG. 3(b) shows the 28-day compressive strength, and FIG. 4(c) shows a comparison of representative strength values, with specific strength values shown in Table 3.
TABLE 3 compression Strength values/MPa (100 mm. times.100 mm)
Figure BDA0003010098060000062
As can be seen, the 1# trial matching strength is higher than that of the 1# trial matching strength in comparison with that of the 2# trial matching, namely, the concrete strength can be effectively improved by the admixture with the new formula. Comprehensive comparison, 4# trial with the highest intensity, R7dIs 66.7MPa, R28dThe concrete cubic compressive strength is 76.7MPa, is 109.6 percent of the designed value of the cubic concrete compressive strength and is less than 1.15 times of the designed strength, but the mixture ratio does not reach the standard. Therefore, the admixture prepared in the embodiment 2 is applied to the preparation of C70 high-strength concrete crushed pebbles and crushed stone concrete, which is beneficial to improving the compressive strength of the concrete and can provide a basis for the trial preparation of the high-strength concrete in the future.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims (4)

1. The preparation method of the crushed pebble and crushed stone concrete admixture based on the C70 high-strength concrete is characterized by comprising the following steps of: the method comprises the following steps:
step one, adding an unsaturated polyoxyethylene ether macromonomer and water into a reaction kettle at a mass ratio of 1:3 at a temperature of 25-30 ℃, and stirring;
step two, after stirring uniformly, simultaneously dripping a material A and a material B, wherein the material A is a mixed aqueous solution of unsaturated anhydride or carboxylic acid, a reducing agent and a chain transfer agent, and the dripping time is 3-3.5 hours; the material B is an oxidant aqueous solution, and is dripped for 2 to 2.5 hours;
and step three, after the dropwise addition and the curing are finished for 1 hour, adding a sodium hydroxide solution, and adjusting the pH value to 5-7 to obtain the concrete polycarboxylic acid admixture with the solid content of 40-45%.
2. The method for preparing the C70-based high-strength concrete crushed gravel and crushed stone concrete admixture as claimed in claim 1, wherein the method comprises the following steps: in the first step, the saturation degree of the unsaturated polyoxyethylene ether macromonomer is not more than 0.37, and the molecular weight is 2400.
3. The method for preparing the C70-based high-strength concrete crushed gravel and crushed stone concrete admixture as claimed in claim 1, wherein the method comprises the following steps: and in the second step, the aqueous solution of the oxidant is at least one of ammonium persulfate, potassium persulfate and permanganic acid.
4. The method for preparing the C70-based high-strength concrete crushed gravel and crushed stone concrete admixture as claimed in claim 1, wherein the method comprises the following steps: and in the second step, the reducing agent is at least one of VC, ferrous sulfate, oxalic acid and sodium thiosulfate.
CN202110373181.2A 2021-04-07 2021-04-07 Preparation method of C70-based high-strength concrete crushed pebble and crushed stone concrete admixture Pending CN112920347A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104371076A (en) * 2014-12-04 2015-02-25 河北铁园科技发展有限公司 Method of synthesizing polycarboxylate superplasticizer at normal temperature
CN104987469A (en) * 2015-06-30 2015-10-21 同济大学 Preparing method for high dispersion type polycarboxylate water reducing agent

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104371076A (en) * 2014-12-04 2015-02-25 河北铁园科技发展有限公司 Method of synthesizing polycarboxylate superplasticizer at normal temperature
CN104987469A (en) * 2015-06-30 2015-10-21 同济大学 Preparing method for high dispersion type polycarboxylate water reducing agent

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Application publication date: 20210608