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What is the role of the air-entraining agent in concrete?

Air-entraining agents can introduce many evenly distributed, stable, and closed micro-bubbles in concrete mixing. Concrete mixed with an air-entraining agent can significantly improve the paste's compatibility and the hardened concrete permeability and frost resistance. Although mixed with air-entraining agent concrete production is very small, the impact on the concrete industry is very large, the main role of.

1. Improvement of concrete compatibility

Admixture of an air-entraining agent, the formation of a large number of tiny closed air bubbles in the mix, these micro-bubbles as a ball, reducing the aggregate particles between the Mochi-resistance, so that the mix of ten mixing fluidity increase, especially in artificial sand or natural sand particles coarse, poor grading and cement concrete ten in the use of the effect is better. At the same time, due to the uniform distribution of water in many bubbles on the surface, the amount of water can move freely to reduce the concrete water secretion.

2. Improve the impermeability, frost resistance, and durability of concrete.

Frost resistance

It is well known that the main function of air-entraining agents is to improve the frost resistance and durability of concrete. The air-entraining agent, as the most important technical measure to improve the frost resistance of concrete, has been widely used in engineering practice, and its effect has been recognized.

Generally, the air content of non-air-entraining concrete is less than 1.8%, and this part of the air bubbles are mostly trapped large bubbles, which have a very unfavorable effect on the performance of concrete. However, air-entraining agents produce mostly uniform tiny bubbles, which have many favorable effects on concrete properties and differ greatly from trapped large air bubbles.

The optimum air content introduced is 3-6% plain concrete and 9-10% mortar. Within the above control range, the frost resistance of concrete gradually improves with the increase of air content, up to tens of times. As the air-entraining agent in the concrete can introduce a lot of uniformly distributed tiny bubbles, all kinds of materials in the concrete have the role of inhibiting the settlement of water secretion and preventing the uneven configuration of concrete materials, thus preventing the occurrence of large air bubbles in the blank concrete on the unfavorable situation of concrete frost resistance. Tests show that with the introduction of 2.2% air content so that the total air content of concrete to 4%, the durability index of the soil mix can reach 120%. In comparison, the original only contains a 1.8% air content concrete durability index of only 15%.

However, it is not that the greater the air content, the better; the air content exceeds a certain limit, and the concrete frost resistance will be reduced, such as the amount of air-entraining increased by 1%, mixed tight ten strength decreased by 3% -5%.

Seepage resistance

Literature research shows that the introduction of 4% air content in concrete can make the impermeability of about 15% or more because the air-entraining agent changes the alkaline pore structure system, closes a lot of capillary pore channel, at the same time in the formation of cement particles on the surface of the water-repellent film, thus reducing the capillary suction effect.

Many of the introduction of secretions are small pores that can not be filled by water, excess down to relieve the physical expansion. This improves the permeability.

The water-cement ratio is the main factor affecting the performance of permeability. The larger the water-cement ratio surrounded by cement particles of the waterproof layer is thicker, many the mixing water in the cement stone to form interconnected and irregular capillary channels, increase the water permeability of the concrete, mixed with an air-entraining agent and high-efficiency water-reducing agent of the concrete water-cement ratio of 0.5 or less, or even up to 0.3 or less, the change in the porosity of the concrete, coupled with air-entraining agent produces a fine, uniform, independent and do not want to pass through the air bubbles, effectively isolate The change of porosity in concrete, coupled with the air-entraining agent produces small, uniform, independent bubbles that do not want to pass, effectively isolate the capillary channels in the concrete, preventing water penetration. We use a variety of methods of testing to show that the mixing of air-entraining agents of concrete impermeable marks up to S12 or more. Engineering practice has proved that air-entraining agents and water-reducing agents formulated concrete without needing other waterproofing measures, you can achieve the purpose of waterproofing and impermeability, and the economic benefits are very considerable.

3. Reduce the strength of concrete; deformation capacity increases

Due to the presence of a large number of bubbles, reducing the effective bearing area of concrete so that the strength of concrete is reduced. General air content increases by 1%, the strength decreases by 4-6%, and the flexural strength decreases by 2-3%. To prevent the strength of concrete from decreasing too much, the construction should strictly control the content of air-entraining agents and introduce air-entraining water-reducing agents to make up. Mixed with an air-entraining agent, the concrete gas content limit can be controlled by the maximum particle size of the aggregate. The maximum particle size of coarse aggregate is larger, the smaller the appropriate air content of the response. For air-entraining agents with a certain water reduction effect, the concrete strength is compensated by reducing the water-cement ratio. Therefore, the use of air-entraining agents to strictly control its mixing amount to achieve the best results.

In addition, due to the presence of many bubbles, the elastic deformation of concrete increases, and the modulus of elasticity is reduced, which improves the crack resistance of mixed tight ten. Mixed with an air-entraining agent of concrete dry shrinkage deformation also increased slightly.

4. Increase the volume of concrete

Due to the introduction of many air-entraining agent bubbles, the volume of concrete increases, and the density decreases, so it can save materials and increase the construction area.

Tests have shown that the air-entraining agent or air-entraining water-reducing agent for concrete or cement mortar in the mortar or to get the adverse effects of the fluidity of the concrete small, especially for plain concrete; the effect is better. Therefore, the application effect of an air-entraining agent or air-reducing agent applied to cement mortar or directly with coagulation to test the results is more satisfactory.

In summary, the application range of air-entraining agents is relatively wide, and the technology is not complex, mainly the selection of better products, strict control of the dosage, and comprehensive consideration of various factors on the impact of gas content will be able to achieve the best economic benefits.

Concrete additives Supplier

TRUNNANO is a reliable concrete additives supplier with over 12-year experience in nano-building energy conservation and nanotechnology development.

If you are looking for high-quality concrete additives, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com)

We accept payment via Credit Card, T/T, West Union, and Paypal. TRUNNANO will ship the goods to customers overseas through FedEx, DHL, by air, or by sea.

What is chopped carbon fiber?

Carbon fiber chopped strands are cut from carbon fiber filaments, and their basic properties mainly depend on the properties of their raw materials—carbon fiber filaments. Carbon fiber refers to high-strength and high-modulus fibers with more than 90% carbon content. High-temperature resistance ranks first among all chemical fibers. Carbon fiber is made of acrylic and viscose fiber, oxidized and carbonized at high temperatures. It is an outstanding material for manufacturing aerospace and other high-tech equipment.

Features of Chopped Carbon Fiber

1. Chopped carbon fiber comprises graphite sheets composed of condensed polycyclic aromatic hydrocarbons belonging to the two-dimensional turbostratic graphite structure.

2. The quality of chopped carbon fiber is lighter than metal aluminum. Still, its strength is higher than that of steel, and it has the characteristics of high hardness, high strength, lightweight, high chemical resistance, and high-temperature resistance.

3. Chopped carbon fiber has the inherent characteristics of carbon materials and the soft machinability of textile fibers. It is a new reinforcing fiber, making it widely used in aerospace, civil engineering, military, racing, and other competitive sports products, which is very popular.

What is chopped carbon fiber used for?

Carbon fiber materials have been diffusely used in various military and civilian industries. Carbon fiber-reinforced composite materials can be used in military fields such as aircraft manufacturing and industrial fields like wind power blades, electromagnetic shielding materials, artificial ligaments, and other body substitutes. Carbon fiber is a typical new industrial material in the high-tech field.

Is chopped carbon fiber strong?

Chopped carbon fiber is a widely preferred material for injection and compression molding applications. The resulting product or component is extremely durable, corrosion-resistant, and unrivaled in rigidity. For example, machine parts and gears are subject to long-term operation with minimal wear.

Chopped Carbon Fiber Supplier

TRUNNANO is a reliable chopped carbon fiber supplier with over 12-year experience in nano-building energy conservation and nanotechnology development.

If you are looking for high-quality chopped carbon fiber, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com)

We accept payment via Credit Card, T/T, West Union, and Paypal. TRUNNANO will ship the goods to customers overseas through FedEx, DHL, by air, or by sea.

What is gypsum defoamer?

Gypsum defoamer is a defoamer particularly designed for gypsum. The main components are modified polyether, esterification, and higher carbon alcohol. Defoamers refer to substances that can reduce the surface tension of water, solutions, suspensions, etc., prevent foam formation, or reduce or eliminate the original foam. Many defoamers, such as organosiloxane, polyether, silicon, and ether graft, contain amine, imine, and amide, which have faster defoaming speeds, longer foam suppression time, and a wider range of applicable media, even harsh media environments such as high temperatures, strong acids, and strong alkali.

Features of Gypsum Defoamer

1. Gypsum defoamer has no oil drift, no suspension, is suitable for anion and cationic systems, alkali resistance, defoaming, long antifoaming time, wide application range, and good defoaming and antifoaming effect.

2. The gypsum defoamer overcomes the problems of common silicone defoamers that are prone to oil slick, demulsification, and oil slick under high temperatures and alkaline conditions.

3. Gypsum defoamer is especially suitable for defoaming and antifoaming under alkaline conditions, high-temperature resistance, strong alkali resistance, and strong stability.

What is gypsum defoamer used for?

Gypsum defoamers can be used in various construction additives, which is unlimited to the problem of gypsum foam. As cement superplasticizer, gypsum, polycarboxylate superplasticizer, cement mortar, cement mortar admixture, waterproofing agent, concrete admixture, construction admixture, and other foam problems, gypsum defoamer can be used. Industrial defoamers are mainly used in water treatment, paint, textile printing and dyeing, paper, and industrial cleaning.

What are the common defoamers?

The most widely used are mineral oil-based materials because of their best performance and lower cost. Non-organic silicon defoamers are also formulated with vegetable oils, white oils, esters, fatty alcohols, synthetic polymers, etc., according to each foaming system's characteristics, compatibility, and requirements.

Gypsum Defoamer Supplier

TRUNNANO is a reliable gypsum defoamer supplier with over 12-year experience in nano-building energy conservation and nanotechnology development.

If you are looking for high-quality gypsum defoamer, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com)

We accept payment via Credit Card, T/T, West Union, and Paypal. TRUNNANO will ship the goods to customers overseas through FedEx, DHL, by air, or by sea.

What is aerogel powder?

Aerogel powder refers to SiO airgel powder products with nanoporous structures. This product has the characteristics of extremely high porosity, extremely low density, high specific surface area, ultra-high pore volume, etc. Also, it has excellent heat insulation performance, good sound insulation, strong adsorption, green environmental protection, flame retardant, and hydrophobic And other excellent performance.

Aerogel Powder Characteristics

1. Excellent thermal insulation performance: the thermal conductivity at room temperature (25°C) is less than 0.018W/m·K.

2. High hydrophobicity: the hydrophobic effect is like a lotus leaf, and the hydrophobicity rate is ≧90%.

3. Extremely low density: light in weight, with a porosity of over 90%.

4. Green and environmental protection: the aerogel powder is composed of inorganic materials, does not contain harmful substances to the human body, and is safe and reliable.

5. Long-lasting heat resistance: The unique nano-three-dimensional network structure provides excellent thermal stability, avoiding the long-term use of traditional thermal insulation materials.

6. Strong adsorption: Aerogel powder has a high surface area and excellent adsorption performance.

What is aerogel powder used for?

1. Aerogel powder is suitable for manufacturing water-based aerogel thermal insulation coatings and water-based airgel slurries.

2.Aerogel powder can be used for polyester chips and functional polyester films.

3. Aerogel powder can be used as filler for thermal insulation foam board.

4. Aerogel powder can be used to purify and adsorb functional fillers.

5. Aerogel powder can be used as a nano-oil displacement agent, "strongly hydrophobic and strong lipophilic," which repels water and is compatible with oil.

6. Aerogel powder can lower the density of composite materials and facilitate the thermal insulation performance, fire resistance performance, and impact resistance performance of composite materials.

Why is aerogel so expensive?

Aerogel preparation involves expensive precursors and chemicals and requires supercritical drying, making it relatively more expensive than conventional building insulation materials.

Aerogel powder Supplier

TRUNNANO is a reliable aerogel powder supplier with over 12-year experience in nano-building energy conservation and nanotechnology development.

If you are looking for high-quality aerogel powder, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com)

We accept payment via Credit Card, T/T, West Union, and Paypal. TRUNNANO will ship the goods to customers overseas through FedEx, DHL, by air, or by sea.