Year1
- 桶装：
- 50kg
Beijing concrete curing agent manufacturer price
Execution standards:
Concrete curing agent, also known as spray film curing, is a curing agent that is sprayed or brushed on the surface of structural components. After the water in the solution evaporates, A layer of plastic film is formed on the concrete surface to separate the concrete surface from the air, prevent internal water from evaporating, and complete the hydration of the cement.
Structure components cured with curing agents do not require watering and maintenance, which saves labor and maintenance water, but the age strength is about low. Suitable for structures with large surface areas that are inconvenient for watering and maintenance (such as chimney walls, components poured at intervals, facades of buildings, and the underside of poured parts, etc.), concrete floors, concrete road pavements, highway pavements, airport runways, or Used in water-scarce areas.
1. Overview of concrete curing agents
． Commonly used curing agents
Film curing agent Film curing agent is a liquid material made by dissolving the base material in a solvent or emulsifier. According to different preparation methods, film curing agents can be divided into solvent-based and emulsified formulations. Solvent-based coatings are more uniform and faster than emulsion-based coatings. The disadvantage is that the solvent evaporates and emits an odor. The emulsified type is low in cost, but due to the slow evaporation of water, it is prone to flowing when used on vertical surfaces. When the curing agent is sprayed on the concrete surface, after the solvent evaporates or the emulsion cracks, some solid matter remains on the concrete surface to form an impermeable film, thereby isolating the concrete from the air and trapping moisture in the concrete. Concrete relies on its own moisture to hydrate to achieve the purpose of curing. In order to reflect sunlight and provide visual inspection of the integrity of the coating film, an appropriate amount of white or gray short-acting dye is usually added to the curing agent.
． Key points for using film curing agents
) Film curing agents can be applied manually or sprayed mechanically, but mechanical spraying produces a uniform coating and is fast in operation, making it especially suitable for large-area use.
) The spraying time depends on the environmental conditions and concrete bleeding conditions. Usually, when there are no water stains on the concrete surface and there are no marks left on the concrete surface, it can be sprayed.
) Spraying too early will affect the bond between the coating film and the concrete surface. Spraying too late will cause the curing agent to be easily absorbed by the pores on the concrete surface and affect the strength of the concrete.
) For the concrete in the form, curing agent should be sprayed immediately after the form is removed. If the concrete surface is obviously dry or has serious water loss, water should be sprayed to make it moist evenly. The curing agent can be sprayed only after the free water on the surface disappears.
) The technical requirements for film curing agents are that they should be non-toxic, able to adhere to the concrete surface, and should also have a certain degree of elasticity and be able to form a film that will not break at least internally.
) Since the film is quite thin and has poor thermal insulation performance, it should be covered or shielded from the sun to avoid exposure to the scorching sun during use in hot summer.
A liquid film concrete curing agent compounded from water-based polymer emulsion, specially designed to prevent moisture loss during early hydration of concrete. This curing agent has good film-forming and permeability properties. When sprayed on the surface of initial setting concrete and cement slurry, it can form a continuous colorless and impermeable high-efficiency curing film. At the same time, it can penetrate into the pores of the concrete and seal it. Capillary pores prevent water evaporation and bleeding on the surface of cement concrete, play a very good role in retaining water and moisturizing, promote complete hydration of cement, improve the structural strength and wear resistance of concrete, and prevent ash and efflorescence. happened.
This product can be used both indoors and outdoors.
2. Performance of concrete curing agent
(1) Characteristics
Water-based environmentally friendly product, low
, colorless and transparent coating, no yellowing
, can Reduce cracks due to plastic shrinkage
, can be applied to the maintenance of planes, facades and complex structural parts
, significantly improve early strength, shorten the construction period
, the color and appearance of concrete Not affected
, water saving, time saving, labor saving
(2), technical data
, color: milky white
, specific gravity:.
, average particle size :＜
, Viscosity:＜. Water retention rate
, value:
, hourly water loss rate <.
, dosage, sprayed square meters per kilogram.
(3) Implementation standards:
Effective water retention rate,
Compressive strength ratio,
Abrasion amount, .
Solid content,
/> Drying time,
Solubility in water after film formation should be indicated as soluble or insoluble
Film formation heat resistance is qualified
(4), Packaging and recommended usage
, Packaging : This product is packed in a plastic barrel.
Construction: This product can be used immediately after opening the barrel. It can also be diluted with water according to the needs of construction. After the newly poured concrete has initially set (approximately ~), or after the concrete has been stripped, immediately spray this product into a uniform film with a spraying equipment, or apply it with a brush or roller.
, Recommended area: It is recommended to spray or coat ~㎡ per kilogram. The specific application area depends on construction needs and concrete surface properties. It is recommended to carry out small-scale construction first to determine the area.
(5) Shelf life:
The shelf life when originally sealed at ~℃ is three years.
(6) Characteristic analysis
, preparation principles, main raw materials and technical performance
In order to achieve better curing effect, after the cement concrete is poured, it must effectively prevent the loss of internal moisture. To this end, the curing agent must have good film-forming properties and be able to form a water-impermeable film on the surface of the concrete to prevent surface water from evaporating. It must also have a certain permeability and be able to chemically react with the surface concrete to block the pores and allow water molecules to migrate. difficulty. In addition, it must have a certain viscosity and stability to ensure good construction performance. Based on these principles, water glass is selected as the main film-forming material, and chemical raw materials such as triethanolamine, urea, and sodium fluorosilicate are added for modification, and a curing agent with a density of . The main technical properties of this curing agent are shown in the table.
Main technical properties of surface curing agent
Appearance stability, solid content, film formation time, water retention rate, effect on concrete
Translucent liquid does not layer and has no side effects
, curing mechanism
The early hydration of cement mainly involves the hydration of tricalcium aluminate (C, C) into calcium aluminate hydrate, and the hydration of tricalcium silicate (C, C) into calcium silicate hydrate and calcium hydroxide.
When the curing agent is sprayed on the concrete surface, on the one hand, an impermeable film is formed on the concrete surface to prevent water evaporation; on the other hand, the above-mentioned chemical reaction occurs within a certain permeable layer of the surface layer, and a layer of The solid film blocks the pores in the concrete and prevents the free water in the cement from evaporating prematurely and excessively, so that the cement can be fully hydrated by its own mixing water to achieve the purpose of self-trophy.
, Curing agent technical performance experiment
Curing agent film thickness and sealing observation test
Spray a standard dose of curing agent on the glass plate to make an air-dried film. Observe that the thickness of the curing agent after film formation is uniform and can form a closed water-tight film without pores for water vapor leakage.
Inspection and Engineering Application
) Raw Materials
Use cement, the alkali content is not greater than.
Use Liaohe sand with fineness modulus, mud content, and no potential alkali-silicate reaction hazard.
The gravel is Leshan gravel, the particle size is ~continuously graded, and there is no potential alkali-silicate reaction hazard.
The admixture adopts air-entraining and anti-bending enhanced admixture.
) Concrete mix ratio
According to the concrete design strength requirements, after mix ratio calculation and trial mix adjustment, the final mix ratio of concrete is determined as: water: cement: sand: gravel: admixture.::. :.:..
) Water retention efficiency test
Using a standard shaking table and plastic test mold, the concrete slump is. The specimens are grouped into blocks. One group of specimens is not sprayed with curing agent, and the remaining groups of specimens are used as benchmark specimens and are sprayed with curing agent, , , respectively. After placing the set of specimens in an environmental control box (test temperature °C, relative humidity, wind speed...), use an electronic balance (sensing) to weigh the moisture loss. The water retention rate test results are shown in the table. After spraying the curing agent, the effective water retention rates of the concrete specimens are above.
Surface water retention test results
No. Spraying amount of curing agent Effective water retention rate
㎡
㎡
㎡
㎡
) Compressive strength ratio Test
Mix concrete according to the above proportions, use a test mold to form a piece, remove the mold after curing in the curing room (temperature is ℃°C), put it into a sealed plastic bag, and use sealing tape to align the surface of the test piece along the sides. Seal the plastic bag. Spray curing agents, , and , respectively on the molding surface. After the surface is dry, place the specimen in a dry chamber (temperature is ℃, relative humidity is). The comparison specimens were placed in the standard curing room for curing.
For comparison, the compressive strengths of the specimens sprayed with curing agent are ., ., ., and ., ., ., ., ., . The compressive strengths of the specimens without curing agent sprayed in the dry chamber are . and . , respectively. It can be seen that after the curing agent is sprayed, the compressive strengths of the concrete specimens are above.
) Solid content test of curing agent
The solid content test results of curing agent show that the solid content reaches..., exceeding the specified requirements.
) Wear resistance test
After the test block is cured, it is taken out from the dry chamber, and then the wear resistance test (type concrete abrasion testing machine) is carried out. The wear amount is used to indicate its wear resistance. .
The abrasion amount of the specimens sprayed with curing agent,,, and are respectively .,.,.,., while the abrasion amount of the specimens without curing agent sprayed is. It can be seen that after spraying curing agent, the concrete specimens The wear resistance of the two groups has been significantly improved, but there is no obvious difference between the wear resistance of the specimens with large spraying volume and the two groups of specimens. It is believed that it may be due to the difference between the pavement concrete and the penetration depth of the pavement concrete involved in the reaction of the curing agent when the spraying volume is too large. There is not much change between them.
) Curing agent drying time test
When the temperature is ℃, the relative humidity is , and the air flow rate is , the drying time of the curing agent is .
) Strength Test
When the concrete surface is smoothed and calendered, lightly pressed and free of fingerprints, use a sprayer to spray the prepared curing agent. The nozzle should be about ~c away from the concrete surface. Spray in two passes, with directions perpendicular to each other. Spray for maintenance.
When the curing agent was sprayed on the concrete slab of an airport pavement, no fine cracks or hairline cracks were seen, indicating a good curing effect. The curing agent is rich in raw materials, low in dosage, low in price, simple in preparation process, and easy to construct. It has good film-forming properties and certain permeability. The concrete surface hardens quickly and has strong wear resistance. It is helpful for accelerating the construction progress and improving the performance of the curing agent. The durability of concrete works well.
Contact information: Contact person Liu Xiaohong
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