CN112079653A - Concrete surface retarder and preparation method and application thereof - Google Patents
Concrete surface retarder and preparation method and application thereof Download PDFInfo
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- CN112079653A CN112079653A CN202010810394.2A CN202010810394A CN112079653A CN 112079653 A CN112079653 A CN 112079653A CN 202010810394 A CN202010810394 A CN 202010810394A CN 112079653 A CN112079653 A CN 112079653A
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/65—Coating or impregnation with inorganic materials
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5006—Boron compounds
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5007—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with salts or salty compositions, e.g. for salt glazing
- C04B41/5009—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with salts or salty compositions, e.g. for salt glazing containing nitrogen in the anion, e.g. nitrites
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a concrete surface retarder, and belongs to the technical field of concrete. The corrosion inhibitor comprises, by mass, 15-25% of a composite retarder, 0.5-1% of a thickener, 0.1-1% of a rust inhibitor and 0.3-2% of a preservative; the solid content of the surface retarder is 19-29%. The invention also provides a preparation method of the retarder and application of the retarder in concrete prefabricated parts. The invention improves the adaptability with cement and widens the application range of the surface retarder by adopting a mode of compounding various retarders; the surface retarder contains a high-temperature resistant retarder, has good high-temperature performance, is suitable for prefabricated parts for natural curing or high-temperature steam curing, and has a wide use temperature range; according to the invention, the types and the use amounts of the raw materials are optimized, the corrosion of the raw materials to the concrete template is fully considered, and the rust inhibitor is added, so that the negative effect of the surface retarder is effectively reduced; the surface retarder has the advantages of low raw material cost, difficult volatilization, environmental friendliness and suitability for popularization and application.
Description
Technical Field
The invention belongs to the technical field of cement additives, and particularly relates to a concrete surface retarder as well as a preparation method and application thereof.
Background
The concrete prefabricated part is a building part which is manufactured in a factory in advance by taking concrete as a basic material, comprises a beam, a plate, a column, building decoration accessories and the like, and has the advantages of high efficiency, energy conservation, environmental protection, cost reduction, service function and performance providing and the like. In recent years, various new building concepts such as building industrialization, energy conservation and emission reduction, quality safety, ecological environment protection and the like bring development opportunities for prefabricated components, a large amount of infrastructure construction in the urbanization process, large-scale guarantee rooms are urgently needed to standardize and quickly construct high-quality buildings, and wide space is provided for the prefabricated components.
The contact part of the prefabricated part and the cast-in-place needs to be roughened so as to increase the combination with the cast-in-place concrete. In the prior roughening process of the concrete prefabricated part, a mechanical rough treatment method is the most common method at present, but has the defects of high labor intensity, low construction efficiency, uneven aggregate exposure and the like.
The use of the surface retarder can also achieve the purposes of chiseling, exposing bones and the like, greatly simplify the chiseling process, reduce the labor intensity and improve the production efficiency. The surface retarder is an additive sprayed and brushed on the surface of concrete, so that the setting time of the surface of the concrete can be prolonged, the setting time, the strength and the like of the base concrete are not influenced, and then the aim of exposing bones, chiseling hair and the like can be fulfilled by adopting high-pressure water to wash the uncoagulated concrete. The prefabricated parts are usually maintained by high-temperature steam, and common surface retarders have poor performance in a high-temperature environment, so that the temperature adaptability of the prefabricated parts is weakened, and the retarder components in the prefabricated parts have poor high-temperature hydration inhibition effect on the cementing materials.
Disclosure of Invention
The invention aims to provide a concrete surface retarder as well as a preparation method and application thereof.
The purpose of the invention is realized by the following technical scheme:
a concrete surface retarder comprises, by mass, 15-25% of a composite retarder, 0.5-1.0% of a thickener, 0.1-1% of a rust inhibitor and 0.3-2.0% of a preservative; the solid content of the surface retarder is 19-29%.
Further, the compound retarder is compounded by raw materials comprising a polymer retarder, an organic phosphine compound and a coagulation auxiliary agent.
Further, the polymer retarder is prepared by free radical polymerization of raw materials including maleic acid glycoside, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and an initiator, wherein the mass ratio of the maleic acid glycoside to the acrylic acid to the 2-acrylamide-2-methylpropanesulfonic acid to the initiator is 5-15: 10-20: 15-35: 1, the total solid content of the polymer retarder is 50%, and the initiator is potassium persulfate.
Further, the organic phosphine retarder is one or more of amino trimethylene phosphonic acid, hydroxy ethylidene diphosphonic acid, sodium ethylene diamine tetra methylene phosphonic acid, diethylene triamine penta methylene phosphonic acid, 2-phosphonic butane-1, 2, 4-tricarboxylic acid, 2-hydroxyphosphonoacetic acid and polyamino polyether methylene phosphonic acid.
Further, the retarding aid is two or more of glucose, sodium gluconate, sucrose, calcium saccharate, syrup, tartaric acid, citric acid and maltodextrin.
Further, the thickening agent is one or more of guar gum, xanthan gum, konjac gum, hydroxypropyl cellulose ether, hydroxyethyl cellulose ether, diutan gum, welan gum, corn starch, scleroglucan, xanthan gum, water-soluble polyvinyl alcohol, polyvinylpyrrolidone and the like.
Further, the rust inhibitor is one or more of sodium benzoate, potassium chromate, sodium nitrite and calcium nitrite.
Further, the preservative is borax.
A preparation method of a concrete surface retarder comprises the following steps:
1) preparing a polymer retarder: adding maleic acid glycoside, acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid into deionized water, dissolving and stirring uniformly, introducing nitrogen, heating, adding an initiator, and reacting to obtain a macromolecular retarder maleic acid glycoside-acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer;
2) mixing liquid raw materials: uniformly mixing liquid raw materials in a polymer retarder, an organic phosphine compound, a retarding aid, a thickening agent, an anti-embroidery agent and a preservative with deionized water;
3) dissolving solid raw materials: dissolving solid raw materials in the polymer retarder, the organic phosphine compound, the retarding aid, the embroidery inhibitor and the preservative into the mixed solution obtained in the step 2), and uniformly stirring;
4) dissolving the solid thickener: slowly adding the solid components in the thickening agent, stirring, dissolving and uniformly mixing to obtain the concrete surface retarder.
In the preparation process, the total using amount of water is adjusted by the solid content of the surface retarder being 19-29%, and the solid content is preferably 27%.
The application of a concrete surface retarder in a concrete prefabricated part.
Compared with the prior art, the invention has the following beneficial effects:
the surface retarder is a viscous pasty liquid, wherein the retarding aid can delay the hydration process by chelating calcium ions and simultaneously adsorbing the calcium ions on the surfaces of cement particles to inhibit the crystallization and nucleation process of hydration products, and also can delay the hydration of cement and prolong the setting time of concrete by inhibiting the dissolution of cement minerals and delaying the formation of supersaturated solution. The composite retarder contains the polymer retarder and the organic phosphine compound, and both have the characteristics of temperature resistance and salt tolerance, so that the retarder still has strong adsorption effect on cement particles even under the high-temperature condition, and has a high-temperature retarding effect. The thickening agent endows the surface retarder with a pseudoplastic fluid characteristic, the viscosity of the fluid is reduced under the action of stress shearing, so that the surface retarder is easy to brush and construct, after the stress shearing action is cancelled, the apparent viscosity of the surface retarder is increased, the flowing property is greatly reduced, the anti-sagging property of the surface retarder on the side surface of a concrete template is increased, the surface retarder can be uniformly adhered to the surface of the template, and meanwhile, the surface retarder can be uniformly and effectively acted on surface concrete. The rust inhibitor can greatly reduce the corrosion of the surface retarder to the template under the normal temperature or high temperature steam curing condition. The preservative acts to extend the life of the surface retarder.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention improves the adaptability with cement and widens the application range of the surface retarder by adopting a mode of compounding various retarders.
2. The surface retarder contains the high-temperature resistant retarder, improves the high-temperature performance of the surface retarder, is suitable for prefabricated parts for natural curing or high-temperature steam curing, and has a wide use temperature range.
3. The invention optimizes the types and the use amounts of the raw materials, fully considers the corrosion of the raw materials to the concrete template, and simultaneously adds the rust inhibitor, thereby effectively reducing the negative effect of the surface retarder.
4. The surface retarder has the advantages of low raw material cost, difficult volatilization, environmental friendliness and suitability for popularization and application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The surface retarder of this example was prepared as follows:
1. preparing a polymer retarder: 10kg of maleic acid glycoside, 15kg of acrylic acid and 24kg of 2-acrylamide-2-methylpropanesulfonic acid are added into 50kg of deionized water, dissolved and stirred uniformly, nitrogen is introduced for 15min, the temperature is raised to 60 ℃, 1kg of potassium persulfate is added, and the reaction is carried out for 2h, so as to prepare the polymer retarder with the total solid content of 50%.
2. Mixing liquid raw materials: 730kg of deionized water, 5kg of borax, 50kg of 2-hydroxyphosphonoacetic acid and 100kg of polymer retarder are weighed and placed in a 1t stirring kettle to be stirred for 5 min.
3. Dissolving solid raw materials: and (3) weighing 100kg of sodium gluconate and 5kg of calcium nitrite, placing the weighed materials in the mixed solution obtained in the step (2), and stirring for 30min until the solution is transparent and clear.
4. Dissolving the solid thickener: 10kg of corn starch was weighed, slowly added to the solution obtained in step 3 and stirred until the solution turned into a viscous liquid.
The solid content of the surface retarder in this example was 22%, wherein the composite retarder was 20% (5% polymer retarder, 5% 2-hydroxyphosphonoacetic acid, 10% sodium gluconate), the thickener (corn starch) was 1%, the rust inhibitor (sodium nitrite) was 0.5%, the preservative (borax) was 0.5%, and the balance was water.
The surface retarder is used on a smooth template, oil stains on the template are cleaned before painting, then the surface retarder is evenly painted on the surface of the template, and concrete can be poured after air drying for 0.5-1 h. And (3) curing for 12h by adopting steam at 50 ℃, and continuously flushing the surface of the test piece by using a high-pressure water gun with the pressure of more than 5MPa until no concrete chips exist. After the concrete workpiece is washed, the surface of the concrete workpiece is better in scabbling effect, the scabbling depth is 3.2mm, and the strength of the main body of the workpiece is not affected.
Example 2
The surface retarder of this example was prepared as follows:
1. preparing a polymer retarder: adding 9kg of maleic acid glycoside, 10kg of acrylic acid and 30kg of 2-acrylamide-2-methylpropanesulfonic acid into 50kg of deionized water, dissolving, uniformly stirring, introducing nitrogen for 15min, heating to 60 ℃, adding 1kg of potassium persulfate, and reacting for 2h to obtain the polymer retarder with the total solid content of 50%.
2. Mixing liquid raw materials: 730kg of deionized water, 5kg of borax, 50kg of amino trimethylene phosphonic acid and 100kg of polymer retarder are weighed and placed in a 1t stirring kettle to be stirred for 5 min.
3. Dissolving solid raw materials: and (3) weighing 100kg of sucrose and 5kg of calcium nitrite, placing the mixture obtained in the step (2), and stirring for 30min until the solution is transparent and clear.
4. Dissolving the solid thickener: 10kg of corn starch was weighed, slowly added to the solution obtained in step 3 and stirred until the solution turned into a viscous liquid.
The surface retarder of this example has a solid content of 22%, wherein the retarder comprises 20% (5% polymer retarder, 5% amino trimethylene phosphonic acid, 10% sucrose), the thickener (corn starch) 1%, the rust inhibitor (calcium nitrite) 0.5%, the preservative (borax) 0.5%, and the balance water.
The surface retarder is used on the template, the treatment mode is the same as that of the embodiment 1, after washing, the surface roughening effect of the obtained concrete workpiece is good, the roughening depth is 3.4mm, and the strength of the workpiece main body is not affected.
Example 3
The surface retarder of this example was prepared as follows:
1. preparing a polymer retarder: 5kg of maleic acid glycoside, 10kg of acrylic acid and 34kg of 2-acrylamide-2-methylpropanesulfonic acid are added into 50kg of deionized water, dissolved and stirred uniformly, nitrogen is introduced for 15min, the temperature is raised to 60 ℃, 1kg of potassium persulfate is added, and the reaction is carried out for 2h, so as to prepare the polymer retarder with the total solid content of 50%.
2. Mixing liquid raw materials: 730kg of deionized water, 5kg of borax, 50kg of ethylenediamine tetramethylene phosphonic acid and 100kg of polymer retarder acid are weighed and placed in a 1t stirring kettle to be stirred for 5 min.
3. Dissolving solid raw materials: and (3) weighing 100kg of sucrose and 5kg of sodium oxalate, placing the mixture into the mixed solution obtained in the step (2), and stirring for 30min until the solution is transparent and clear.
4. Dissolving the solid thickener: 10kg of xanthan gum was weighed, slowly added to the solution obtained in step 3, and stirred until the solution turned into a viscous liquid.
The surface retarder of this example has a solid content of 22%, wherein the retarder comprises 20% (5% polymer retarder, 5% ethylenediamine tetramethylene phosphine, 10% sucrose), 1% thickener (xanthan gum), 0.5% rust inhibitor (sodium oxalate), 0.5% preservative (borax), and the balance water.
The surface retarder is used on the template, the treatment mode is the same as that of the embodiment 1, after washing, the surface roughening effect of the obtained concrete workpiece is good, the roughening depth is 3.0mm, and the strength of the workpiece main body is not affected.
Example 4
The surface retarder of this example was prepared as follows:
1. preparing a polymer retarder: adding 14kg of maleic acid glycoside, 20kg of acrylic acid and 15kg of 2-acrylamide-2-methylpropanesulfonic acid into 50kg of deionized water, dissolving, uniformly stirring, introducing nitrogen for 15min, heating to 60 ℃, adding 1kg of potassium persulfate, and reacting for 2h to obtain the polymer retarder with the total solid content of 50%.
2. Mixing liquid raw materials: 740kg of deionized water, 5kg of borax, 30kg of sodium ethylene diamine tetramethylene phosphonate and 60kg of polymer retarder are weighed and placed in a 1t stirring kettle for stirring for 5 min.
3. Dissolving solid raw materials: weighing 150kg of calcium sucrose and 5kg of sodium benzoate, placing in the mixed solution obtained in the step 2, and stirring for 30min until the solution is transparent and clear.
4. Dissolving the solid thickener: 10kg of guar gum are weighed, slowly added to the solution obtained in step 3 and stirred until the solution turns into a viscous liquid.
The surface retarder of this example has a solid content of 23%, wherein the retarder is 21% (3% polymer retarder, 3% sodium ethylene diamine tetra methylene phosphonate, 15% calcium sucrose), the thickener (guar gum) is 1%, the rust inhibitor (sodium benzoate) is 0.5%, the preservative (borax) is 0.5%, and the balance is water.
The surface retarder is used on the template, the treatment mode is the same as that of the embodiment 1, after washing, the surface roughening effect of the obtained concrete workpiece is good, the roughening depth is 2.6mm, and the strength of the workpiece main body is not affected.
Example 5
The surface retarder of this example was prepared as follows:
1. preparing a polymer retarder: adding 12kg of maleic acid glycoside, 13kg of acrylic acid and 24kg of 2-acrylamide-2-methylpropanesulfonic acid into 50kg of deionized water, dissolving and uniformly stirring, introducing nitrogen for 15min, heating to 60 ℃, adding 1kg of potassium persulfate, and reacting for 2h to obtain the polymer retarder with the total solid content of 50%.
2. Mixing liquid raw materials: 635kg of deionized water, 150kg of polymer retarder, 50kg of 2-phosphonobutane-1, 2, 4-tricarboxylic acid and 3kg of borax are weighed and placed in a 1t stirring kettle to be stirred for 5 min.
3. Dissolving solid raw materials: and (3) weighing 150kg of calcium saccharate, 1kg of calcium nitrite and 1kg of potassium chromate, putting the mixture obtained in the step (2), and stirring for 30min until the solution is transparent and clear.
4. Dissolving the solid thickener: 10kg of hydroxypropyl cellulose ether was weighed, slowly added to the solution obtained in step 3 and stirred until the solution turned into a viscous liquid.
The surface retarder of this example has a solid content of 26.5%, wherein 25% of retarder (7.5% polymer retarder, 5% butane-2-phosphonate-1, 2, 4-tricarboxylic acid, 12.5% calcium saccharate), 1% of thickener (hydroxypropyl cellulose ether), 0.2% of rust inhibitor (calcium nitrite and potassium chromate), 0.3% of preservative (borax), and the balance water.
The surface retarder is used on the template, the treatment mode is the same as that of the embodiment 1, after washing, the surface roughening effect of the obtained concrete workpiece is good, the roughening depth is 2.7mm, and the strength of the workpiece main body is not affected.
Example 6
The surface retarder of this example was prepared as follows:
1. preparing a polymer retarder: adding 11kg of maleic acid glycoside, 18kg of acrylic acid and 20kg of 2-acrylamide-2-methylpropanesulfonic acid into 50kg of deionized water, dissolving and uniformly stirring, introducing nitrogen for 15min, heating to 60 ℃, adding 1kg of potassium persulfate, and reacting for 2h to obtain the polymer retarder with the total solid content of 50%.
2. Mixing liquid raw materials: weighing 624kg of deionized water, 200kg of polymer retarder, 20kg of 2-hydroxyphosphonoacetic acid and 20kg of borax, placing in a 1t stirring kettle, and stirring for 5 min.
3. Dissolving solid raw materials: and (3) weighing 130kg of calcium saccharate and 1kg of sodium nitrite, placing the calcium saccharate and the sodium nitrite into the mixed solution obtained in the step (2), and stirring for 30min until the solution is transparent and clear.
4. Dissolving the solid thickener: 5kg of polyvinylpyrrolidone was weighed, slowly added to the solution obtained in step 3, and stirred until the solution turned into a viscous liquid.
The surface retarder of this example has a solid content of 28.6%, wherein 25% of the retarder (10% of polymer retarder, 2% of 2-hydroxyphosphonoacetic acid, 13% of calcium saccharate), 0.5% of thickener (polyvinylpyrrolidone), 0.1% of rust inhibitor (sodium nitrite), 2% of preservative (borax), and the balance of water.
The surface retarder is used on the template, the treatment mode is the same as that of the embodiment 1, after washing, the surface roughening effect of the obtained concrete workpiece is good, the roughening depth is 2.8mm, and the strength of the workpiece main body is not affected.
Example 7
The surface retarder of this example was prepared as follows:
1. preparing a polymer retarder: adding 11kg of maleic acid glycoside, 18kg of acrylic acid and 20kg of 2-acrylamide-2-methylpropanesulfonic acid into 50kg of deionized water, dissolving and uniformly stirring, introducing nitrogen for 15min, heating to 60 ℃, adding 1kg of potassium persulfate, and reacting for 2h to obtain the polymer retarder with the total solid content of 50%.
2. Mixing liquid raw materials: 750kg of deionized water, 120kg of polymer retarder, 20kg of polyamino polyether methylene phosphonic acid and 10kg of borax are weighed and placed in a 1t stirring kettle to be stirred for 5 min.
3. Dissolving solid raw materials: and (3) weighing 50kg of calcium sucrose, 20kg of maltodextrin, 20kg of sodium gluconate, 3kg of calcium nitrite and 2kg of potassium chromate, putting the mixture into the mixed solution obtained in the step (2), and stirring for 30min until the solution is transparent and clear.
4. Dissolving the solid thickener: and (3) weighing 5kg of konjac glucomannan, slowly adding the konjac glucomannan into the solution obtained in the step (3), and stirring until the solution is converted into viscous liquid.
The surface retarder of this example has a solid content of 19%, wherein the retarder is 17% (6% polymer retarder, 2% polyamino polyether methylene phosphonic acid, 5% calcium sucrose, 2% maltodextrin, 2% sodium gluconate), the thickener (konjac gum) is 0.5%, the rust inhibitor (calcium nitrite and potassium chromate) is 0.5%, the preservative (borax) is 1%, and the balance is water.
The surface retarder is used on the template, the treatment mode is the same as that of the embodiment 1, after washing, the surface roughening effect of the obtained concrete workpiece is good, the roughening depth is 3.2mm, and the strength of the workpiece main body is not affected.
Example 8
The surface retarder of this example was prepared as follows:
1. preparing a polymer retarder: 10kg of maleic acid glycoside, 15kg of acrylic acid and 24kg of 2-acrylamide-2-methylpropanesulfonic acid are added into 50kg of deionized water, dissolved and stirred uniformly, nitrogen is introduced for 15min, the temperature is raised to 60 ℃, 1kg of potassium persulfate is added, and the reaction is carried out for 2h, so as to prepare the polymer retarder with the total solid content of 50%.
2. Mixing liquid raw materials: 750kg of deionized water, 120kg of polymer retarder, 20kg of polyamino polyether methylene phosphonic acid and 10kg of preservative (borax) are weighed and placed in a 1t stirring kettle to be stirred for 5 min.
3. Dissolving solid raw materials: 50kg of calcium saccharate, 100kg of maltodextrin, 100kg of sodium gluconate, 3kg of calcium nitrite and 2kg of potassium chromate are weighed and placed in the mixed solution obtained in the step 2, and the mixed solution is stirred for 30min until the solution is transparent and clear.
4. Dissolving the solid thickener: and (3) weighing 5kg of konjac glucomannan, slowly adding the konjac glucomannan into the solution obtained in the step (3), and stirring until the solution is converted into viscous liquid.
The surface retarder of the present example has a solid content of 27%, wherein 25% of the retarder (2% of polyamino polyether methylene phosphonic acid, 5% of calcium sucrose, 8% of maltodextrin, 10% of sodium gluconate), 0.5% of the thickener (konjac glucomannan), 0.5% of the rust inhibitor (calcium nitrite and potassium chromate), 1% of the preservative (borax), and the balance of water.
The surface retarder is used on the template, the treatment mode is the same as that of the embodiment 1, after washing, the surface roughening effect of the obtained concrete workpiece is good, the roughening depth is 3.0mm, and the strength of the workpiece main body is not affected.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The concrete surface retarder is characterized by comprising, by mass, 15% -25% of a composite retarder, 0.5% -1% of a thickener, 0.1% -1% of a rust inhibitor and 0.3% -2% of a preservative; the solid content of the surface retarder is 19-29%.
2. The concrete surface retarder of claim 1, wherein the composite retarder is compounded from raw materials comprising a polymeric retarder, an organic phosphonic compound, and a set retarder aid.
3. The concrete surface retarder according to claim 2, wherein the polymer retarder is prepared by free radical polymerization of raw materials comprising maleic acid glycoside, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid and an initiator, wherein the mass ratio of the maleic acid glycoside to the acrylic acid to the 2-acrylamide-2-methylpropanesulfonic acid to the initiator is 5-15: 10-20: 15-35: 1, the total solid content of the polymer retarder is 50%, and the initiator is potassium persulfate.
4. The concrete surface retarder of claim 2, wherein the organophosphine retarder is one or more of aminotrimethylenephosphonic acid, hydroxyethylidene diphosphonic acid, sodium ethylenediaminetetramethylidene phosphonate, ethylenediaminetetramethylidene phosphonic acid, diethylenetriaminepentamethylenephosphonic acid, 2-phosphonobutane-1, 2, 4-tricarboxylic acid, 2-hydroxyphosphonoacetic acid, polyaminopolyether methylene phosphonic acid.
5. The concrete surface retarder of claim 2, wherein the retarding aid is two or more of glucose, sodium gluconate, sucrose, calcium saccharate, syrup, tartaric acid, citric acid, and maltodextrin.
6. The concrete surface retarder of claim 1, wherein the thickener is one or more of guar gum, xanthan gum, konjac gum, hydroxypropyl cellulose ether, hydroxyethyl cellulose ether, diutan gum, welan gum, corn starch, scleroglucan, xanthan gum, water-soluble polyvinyl alcohol, polyvinylpyrrolidone, and the like.
7. The concrete surface retarder of claim 1, wherein the rust inhibitor is one or more of sodium benzoate, stannous chloride, potassium chromate, sodium nitrite, calcium nitrite, sodium oxalate, fluoroaluminate, organic phosphonate, and compound amino alcohol rebar rust inhibitor.
8. The method for preparing a concrete surface retarder according to any one of claims 1 to 7, comprising the steps of:
1) preparing a polymer retarder: adding maleic acid glycoside, acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid into deionized water, dissolving and stirring uniformly, introducing nitrogen, heating, adding an initiator, and reacting to obtain a macromolecular retarder maleic acid glycoside-acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer;
2) mixing liquid raw materials: uniformly mixing liquid raw materials in a polymer retarder, an organic phosphine compound, a retarding aid, a thickening agent, an anti-embroidery agent and a preservative with deionized water;
3) dissolving solid raw materials: dissolving solid raw materials in the polymer retarder, the organic phosphine compound, the retarding aid, the embroidery inhibitor and the preservative into the mixed solution obtained in the step 2), and uniformly stirring;
4) dissolving the solid thickener: slowly adding the solid components in the thickening agent, stirring, dissolving and uniformly mixing to obtain the concrete surface retarder.
9. The use of a concrete surface retarder according to any one of claims 1 to 7 in precast concrete components.
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| CN202010810394.2A CN112079653A (en) | 2020-08-13 | 2020-08-13 | Concrete surface retarder and preparation method and application thereof |
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| CN202010810394.2A CN112079653A (en) | 2020-08-13 | 2020-08-13 | Concrete surface retarder and preparation method and application thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112961658A (en) * | 2021-03-09 | 2021-06-15 | 嘉华特种水泥股份有限公司 | Long-sealing-section large-temperature-difference cement slurry system for well cementation |
| CN112980409A (en) * | 2021-03-09 | 2021-06-18 | 嘉华特种水泥股份有限公司 | Retarder suitable for large-temperature-difference well cementation and preparation method thereof |
| CN113292267A (en) * | 2021-01-15 | 2021-08-24 | 云南森博混凝土外加剂有限公司 | Malt syrup retarder and preparation method and application thereof |
| CN113896448A (en) * | 2021-11-25 | 2022-01-07 | 十九冶成都建设有限公司 | Additive for ultra-large volume concrete |
| CN114014608A (en) * | 2021-11-11 | 2022-02-08 | 云南中建西部建设有限公司 | Preparation method and construction method of pervious concrete capable of being transported and constructed in ultra-long distance |
| CN114351457A (en) * | 2022-01-11 | 2022-04-15 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Super-retarding exposed stone material for railway prefabricated sleeper and construction method thereof |
| CN115215579A (en) * | 2021-04-21 | 2022-10-21 | 泰安市联强远大住宅工业有限公司 | Exposed aggregate agent for fabricated building and gypsum product and preparation method thereof |
| CN115819114A (en) * | 2022-10-28 | 2023-03-21 | 中铁建设集团有限公司 | High-performance aggregate exposing agent for assembled concrete member and preparation method thereof |
| CN116425565A (en) * | 2022-12-13 | 2023-07-14 | 广东红墙新材料股份有限公司 | Surface retarder and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113292267A (en) * | 2021-01-15 | 2021-08-24 | 云南森博混凝土外加剂有限公司 | Malt syrup retarder and preparation method and application thereof |
| CN112961658A (en) * | 2021-03-09 | 2021-06-15 | 嘉华特种水泥股份有限公司 | Long-sealing-section large-temperature-difference cement slurry system for well cementation |
| CN112980409A (en) * | 2021-03-09 | 2021-06-18 | 嘉华特种水泥股份有限公司 | Retarder suitable for large-temperature-difference well cementation and preparation method thereof |
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| CN114014608A (en) * | 2021-11-11 | 2022-02-08 | 云南中建西部建设有限公司 | Preparation method and construction method of pervious concrete capable of being transported and constructed in ultra-long distance |
| CN113896448A (en) * | 2021-11-25 | 2022-01-07 | 十九冶成都建设有限公司 | Additive for ultra-large volume concrete |
| CN114351457A (en) * | 2022-01-11 | 2022-04-15 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Super-retarding exposed stone material for railway prefabricated sleeper and construction method thereof |
| CN115819114A (en) * | 2022-10-28 | 2023-03-21 | 中铁建设集团有限公司 | High-performance aggregate exposing agent for assembled concrete member and preparation method thereof |
| CN116425565A (en) * | 2022-12-13 | 2023-07-14 | 广东红墙新材料股份有限公司 | Surface retarder and preparation method thereof |
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Application publication date: 20201215 |