CN112299743A - Concrete surface retarder and production process and use method thereof - Google Patents
Concrete surface retarder and production process and use method thereof Download PDFInfo
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- CN112299743A CN112299743A CN201910709310.3A CN201910709310A CN112299743A CN 112299743 A CN112299743 A CN 112299743A CN 201910709310 A CN201910709310 A CN 201910709310A CN 112299743 A CN112299743 A CN 112299743A
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a concrete surface retarder and a production process and a using method thereof, belonging to the technical field of concrete retarders, wherein the concrete surface retarder consists of the following raw materials in parts by weight: 0.1-1.5 parts of hydroxypropyl methyl cellulose, 0.05-5.0 parts of sodium gluconate, 0.1-0.50 part of xanthan gum, 1-15 parts of sorbitol solution, l-25 parts of glycerol, 0.1-0.50 part of defoaming agent, 0.1-0.50 part of preservative, 0.1-0.50 part of antirust agent and 20-90 parts of deionized water; and weighing the raw materials in proportion, mixing the raw materials in a container, and uniformly stirring to obtain the coagulation upper surface retarder. The water-based environment-friendly product is simple and convenient to operate and safe to use, greatly reduces the labor intensity of workers, improves the production efficiency, saves the construction cost, and has long slow setting time and good sagging property.
Description
Technical Field
The invention relates to the technical field of concrete retarders, in particular to a concrete surface retarder as well as a production process and a use method thereof.
Background
Along with the development of lotus of national economy of China and the continuous improvement of the living standard of people, people have stronger and stronger consciousness on environmental protection, especially along with the rapid development of recent economy of China, the building industrialization is produced, the assembly type building is developed rapidly, the assembly type building components are produced in factories, the dust pollution and the noise pollution of construction sites are greatly reduced, the labor intensity of workers is reduced, a large number of templates are saved, therefore, the assembly type building has great significance on environmental protection and energy conservation, and the development shadow is wide
After the assembly type building components are produced in a factory, the assembly type building components are transported to a site to be hoisted, a plurality of post-cast strips can be reserved among the components, and after the hoisting is finished, the post-cast strips are poured. In order to ensure the bonding strength between the post-cast strip and the concrete member, the contact surface is subjected to surface roughening treatment during the production of the member so as to achieve the effect of mechanical engagement.
The traditional surface roughening treatment is implemented by adopting tools such as a steel brush, an electric hammer, an air pick, a steel chisel and the like, the construction mode has the defects of high labor intensity of workers, low working efficiency, uneven exposure of aggregates, elegant dust everywhere, environmental pollution, high construction cost and the like, time and labor are wasted, the environment is polluted, the efficiency is low, the cost is high, and potential safety hazards caused by cracks generated in concrete due to vibration are easily caused
Chinese patent application CN187132A discloses a smearing type time-delay surface retarder which adopts vegetable oil and its derivatives or animal oil and its derivatives plus sugar or salt or acid, the retarder effect is not significant, and it is not friendly to the environment.
Chinese patent application CN104446642A discloses a concrete smearing type surface time-delay retarder which has the defects of poor sagging property and low construction efficiency (the concrete smearing type surface time-delay retarder is coated when the concrete smearing type surface time-delay retarder is horizontally placed before a template is supported, and the template can be supported after the concrete smearing type surface time-delay retarder is air-dried); secondly, the borax in the components has strong toxicity to human bodies.
Therefore, the invention provides a concrete surface retarder and a production process and a use method thereof. The concrete surface retarder is also called exposed aggregate.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a concrete surface retarder which can improve the production efficiency, reduce the construction cost, and is particularly safe to human bodies, environment-friendly, water-based, green and environment-friendly, and a production process and application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the concrete surface retarder comprises the following raw materials in parts by weight: 0.1-1.5 parts of hydroxypropyl methyl cellulose, 0.05-5.0 parts of sodium gluconate, 0.1-0.50 part of xanthan gum, 1-15 parts of sorbitol solution, l-25 parts of glycerol, 0.1-0.50 part of defoaming agent, 0.1-0.50 part of preservative, 0.1-0.50 part of antirust agent and 20-90 parts of deionized water; and weighing the raw materials in proportion, mixing the raw materials in a container, and uniformly stirring to obtain the coagulation upper surface retarder.
Preferably, the concrete surface retarder consists of the following raw materials in parts by weight: 0.5 part of hydroxypropyl methyl cellulose, 3.0 parts of sodium gluconate, 0.3 part of xanthan gum, 10 parts of sorbitol solution, 20 parts of glycerol, 0.3 part of defoaming agent, 0.3 part of preservative, 0.2 part of antirust agent and 65.4 parts of deionized water.
Preferably, the defoaming agent is polydimethylsiloxane, the preservative is butyl p-hydroxybenzoate, and the antirust agent is benzotriazole.
A production process of a concrete surface retarder comprises the following steps:
step 1, putting the deionized water and the sorbitol liquid in parts by weight into a high-speed liquid stirrer container;
step 2, adding the antirust agent and the preservative which are dissolved by ethanol in parts by weight into a stirrer container, and stirring while adding;
step 3, uniformly mixing the hydroxypropyl methyl cellulose, the sodium gluconate and the xanthan gum in parts by weight in advance, slowly adding the mixture into a stirrer container, stirring while adding, starting to stir slowly at a low speed, after completely adding, quickly stirring for 5-8 minutes, standing for 1-3 minutes, and quickly stirring for 3-5 minutes;
step 4, sequentially adding the glycerol and the defoaming agent in parts by weight, stirring and adding,
and (4) uniformly mixing to obtain the concrete surface retarder.
A method for using a concrete surface retarder comprises the following steps,
s1, brushing a layer of surface retarder on the concrete template needing to be made into a rough surface by a brush or a roller;
s2, pouring concrete, vibrating to be dense, and immersing the surface retarder into the concrete of the contact surface;
s3, removing the formwork after the strength of the concrete reaches the strength required by the formwork removal;
and S4, washing the surface of the concrete by using a high-pressure water gun to expose the aggregate and reach the etching depth required by the design.
The action mechanism of the concrete surface retarder of the invention is mainly as follows:
the sodium gluconate is hydroxyl carboxylate, has strong inhibiting effect on cement hydration product tricalcium silicate, and greatly prolongs the hydration reaction time. Sorbitol and glycerol are polyols, have a strong inhibiting effect on cement hydration, and have the effects of moisturizing and preventing freezing. Hydroxypropyl methyl cellulose belongs to nonionic cellulose mixed ether and has the functions of retarding coagulation, emulsifying, dispersing, stabilizing, thickening and water retention. Xanthan gum is a monad polysaccharide produced by fermentation of Pseudomonas and has the effects of retarding coagulation, moistening, emulsifying, suspending and stabilizing. Defoaming agent: reducing air bubbles in the system. Preservative: the prepared surface retarder is prevented from going bad after being placed for a period of time, and the shelf life is prolonged. Antirust agent: the retarder can be prevented from rusting the steel template after being smeared on the steel template.
The concrete surface retarder has the advantages that:
the water-based environment-friendly product has no volatile harmful gas, is safe to human bodies and is environment-friendly.
The operation is simple, the labor intensity of workers is greatly reduced, and the construction cost is saved.
The slow setting time is long: the retarder time of the concrete surface retarder can reach more than 7 days.
Good sagging property: the surface retarder has very good sagging property, and can be coated once without secondary coating.
Deep etching depth: the surface retarder has very good sagging property, so the coating thickness can be selected according to the actual engineering requirement, and the thicker the coating is, the deeper the etching depth is, and the highest etching depth can reach 20 mm.
The cement variety has the following application range: the retarder has obvious retarding effect on Portland cement, common Portland cement, slag Portland cement, fly ash Portland cement and Portland cement.
The temperature application range is wide: can be used in the range of-15 ℃ to +40 ℃. The concrete can be coated at 40 ℃ in hot summer under direct sunlight, then concrete is poured, and the formwork is removed and washed after the concrete is naturally cured until the strength of the concrete reaches the strength required by formwork removal; or brushing at-15 ℃ in cold winter, then pouring concrete, performing steam curing until the strength of the concrete reaches the strength required by form removal, and then removing the form and washing; the retarding effect of the surface retarder is not influenced.
The operation time range is wide: the concrete can be poured immediately after being painted, or can be poured after being placed for hours or even days after being painted, and the retarding effect of the concrete surface retarder is not influenced.
The strength grade of the concrete has wide application range: the concrete has obvious retardation effect on both low-strength C20 concrete and high-strength C60 concrete.
The application range of the template is wide: the method is suitable for the surface of any template, including steel templates, bamboo plywood, wood templates, engineering plastic templates and the like.
The steel form and the steel bar are not corroded, and the strength of the body on the concrete and the bond stress of the steel bar are not reduced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Example 1
This example illustrates the configuration of 100g of concrete surface retarder:
the invention provides a concrete surface retarder which is prepared from the following raw materials in parts by weight: 0.4g of hydroxypropyl methyl cellulose, 3.0g of sodium gluconate, 0.3g of xanthan gum, 10g of sorbitol solution, 20g of glycerol, 0.4g of defoaming agent, 0.3g of butyl p-hydroxybenzoate, 0.2g of benzotriazole and 65.4g of deionized water.
The invention provides a production process of a concrete surface retarder, which comprises the following steps:
step 1, putting 65.4g of deionized water and 10g of sorbitol liquid into a container of a high-speed liquid stirrer;
step 2, adding 0.3g of butyl p-hydroxybenzoate and 0.2g of benzotriazole which are dissolved by ethanol in advance into a stirrer container, and adding the mixture while stirring;
step 3, 0.4g of hydroxypropyl methyl cellulose, 3.0g of sodium gluconate and 0.3g of xanthan gum are uniformly mixed in advance, then slowly added into a stirrer container, the mixture is stirred and added at the same time, slow and low-speed stirring is started, after the mixture is completely added, the mixture is quickly stirred at 1000rpm for 5 minutes, the mixture is kept still for 2 minutes, and then the mixture is quickly stirred at 1000rpm for 3 minutes, so that the materials are completely dissolved;
and 4, sequentially adding 20g of glycerol and 0.4g of polydimethylsiloxane defoaming agent, and adding while stirring. And (4) uniformly mixing to obtain the concrete surface retarder.
The invention provides a using method of a concrete surface retarder, which comprises the following steps,
s1, before concrete is poured (before or after formwork support), a layer of surface retarder is coated on the surface of the concrete formwork needing to be roughened by a brush or a roller, the coating thickness is determined according to the required depth of exposed aggregate, and the thicker the coating is, the deeper the etching is, the deeper the exposed aggregate is;
s2, pouring concrete, vibrating to be compact, immersing the surface retarder into the concrete on the contact surface, and naturally curing or steaming;
s3, removing the formwork after the strength of the concrete reaches the strength required by the formwork removal;
and S4, after the maintenance is finished, washing the surface of the concrete by using a high-pressure water gun to remove a smooth cement surface, and exposing the aggregate to the rough surface to reach the etching depth required by the design.
Example 2
This example illustrates the configuration of 100g of concrete surface retarder:
the invention provides a concrete surface retarder which is prepared from the following raw materials in parts by weight: 0.5g of hydroxypropyl methyl cellulose, 3.5g of sodium gluconate, 0.30g of xanthan gum, 10g of sorbitol solution, 20g of glycerol, 0.3g of polydimethylsiloxane, 0.3g of butyl p-hydroxybenzoate, 0.2g of benzotriazole and 64.9g of deionized water.
The invention provides a production process of a concrete surface retarder, which comprises the following steps:
step 1, putting 64.9g of deionized water and 10g of sorbitol solution into a container of a high-speed liquid stirrer;
step 2, adding 0.3g of butyl p-hydroxybenzoate and 0.2g of benzotriazole which are dissolved by ethanol in advance into a stirrer container, and adding the mixture while stirring;
step 3, 0.5g of hydroxypropyl methyl cellulose, 3.5g of sodium gluconate and 0.3g of xanthan gum are uniformly mixed in advance, then slowly added into a stirrer container, the mixture is stirred and added at the same time, slow and low-speed stirring is started, after the mixture is completely added, the mixture is quickly stirred at 1000rpm for 5 minutes, the mixture is kept still for 2 minutes, and then the mixture is quickly stirred at 1000rpm for 3 minutes, so that the materials are completely dissolved;
and 4, sequentially adding 20g of glycerol and 0.3g of polydimethylsiloxane, stirring and uniformly mixing to obtain the concrete surface retarder.
The invention provides a using method of a concrete surface retarder, which comprises the following steps,
s1, before concrete is poured (before or after formwork support), a layer of surface retarder is coated on the surface of the concrete formwork needing to be roughened by a brush or a roller, the coating thickness is determined according to the required depth of exposed aggregate, and the thicker the coating is, the deeper the etching is, the deeper the exposed aggregate is;
s2, pouring concrete, vibrating to be compact, immersing the surface retarder into the concrete on the contact surface, and naturally curing or steaming;
s3, removing the formwork after the strength of the concrete reaches the strength required by the formwork removal;
and S4, after the maintenance is finished, washing the surface of the concrete by using a high-pressure water gun to remove a smooth cement surface, and exposing the aggregate to the rough surface to reach the etching depth required by the design.
The concrete surface retarder has the advantages that:
the water-based environment-friendly product has no volatile harmful gas, is safe to human bodies and is environment-friendly.
The operation is simple, the labor intensity of workers is greatly reduced, and the construction cost is saved.
The slow setting time is long: the retarder time of the concrete surface retarder can reach more than 7 days.
Good sagging property: the surface retarder has very good sagging property, and can be coated once without secondary coating.
Deep etching depth: the surface retarder has very good sagging property, so the coating thickness can be selected according to the actual engineering requirement, and the thicker the coating is, the deeper the etching depth is, and the highest etching depth can reach 20 mm.
The cement variety has wide application range: the retarder has obvious retarding effect on Portland cement, common Portland cement, slag Portland cement, fly ash Portland cement and Portland cement.
The temperature application range is wide: can be used in the range of-15 ℃ to +40 ℃. The concrete can be coated at 40 ℃ in hot summer under direct sunlight, then concrete is poured, and the formwork is removed and washed after the concrete is naturally cured until the strength of the concrete reaches the strength required by formwork removal; or brushing at-15 ℃ in cold winter, then pouring concrete, performing steam curing until the strength of the concrete reaches the strength required by form removal, and then removing the form and washing; the retarding effect of the surface retarder is not influenced.
The operation time range is wide: the concrete can be poured immediately after being painted, or can be poured after being placed for hours or even days after being painted, and the retarding effect of the concrete surface retarder is not influenced.
The strength grade of the concrete has wide application range: the concrete has obvious retardation effect on both low-strength C20 concrete and high-strength C60 concrete.
The application range of the template is wide: the method is suitable for the surface of any template, including steel templates, bamboo plywood, wood templates, engineering plastic templates and the like.
The steel form and the steel bar are not corroded, and the strength of the body on the concrete and the bond stress of the steel bar are not reduced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. The concrete surface retarder is characterized by comprising the following raw materials in parts by weight: 0.1-1.5 parts of hydroxypropyl methyl cellulose, 0.05-5.0 parts of sodium gluconate, 0.1-0.50 part of xanthan gum, 1-15 parts of sorbitol solution, l-25 parts of glycerol, 0.1-0.50 part of defoaming agent, 0.1-0.50 part of preservative, 0.1-0.50 part of antirust agent and 20-90 parts of deionized water; and weighing the raw materials in proportion, mixing the raw materials in a container, and uniformly stirring to obtain the coagulation upper surface retarder.
2. The concrete surface retarder according to claim 1, which is prepared from the following raw materials in parts by weight: 0.5 part of hydroxypropyl methyl cellulose, 3.0 parts of sodium gluconate, 0.3 part of xanthan gum, 10 parts of sorbitol solution, 20 parts of glycerol, 0.3 part of defoaming agent, 0.3 part of preservative, 0.2 part of antirust agent and 65.4 parts of deionized water.
3. The concrete surface retarder according to claim 1 or 2, wherein the defoaming agent is polydimethylsiloxane, the preservative is butyl p-hydroxybenzoate, and the antirust agent is benzotriazole.
4. A process for producing the concrete surface retarder of claim 1, comprising the steps of:
step 1, putting the deionized water and the sorbitol liquid in parts by weight into a high-speed liquid stirrer container;
step 2, adding the preservative and the antirust agent which are dissolved by ethanol in parts by weight into a stirrer container, and stirring and adding the preservative and the antirust agent;
step 3, uniformly mixing the hydroxypropyl methyl cellulose, the sodium gluconate and the xanthan gum in parts by weight in advance, slowly adding the mixture into a stirrer container, stirring while adding, starting to stir slowly at a low speed, after completely adding, quickly stirring for 5-8 minutes, standing for 1-3 minutes, and quickly stirring for 3-5 minutes;
step 4, sequentially adding the glycerol and the defoaming agent in parts by weight, stirring and adding,
and (4) uniformly mixing to obtain the concrete surface retarder.
5. A method of using the concrete surface retarder of claim 1, comprising the steps of,
s1, brushing a layer of surface retarder on the concrete template needing to be made into a rough surface by a brush or a roller;
s2, pouring concrete, vibrating to be dense, and immersing the surface retarder into the concrete of the contact surface;
s3, removing the formwork after the strength of the concrete reaches the strength required by the formwork removal;
and S4, washing the surface of the concrete by using a high-pressure water gun to expose the aggregate and reach the etching depth required by the design.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113735624A (en) * | 2021-06-04 | 2021-12-03 | 中建科技(济南)有限公司 | Exposed aggregate surface water washing agent and preparation method thereof |
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