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Conplast AE300 - Concrete aerating additive

Chloride-free aerating additive based on a neutralised vinsol resin. Brown coloured solution which disperses instantly in water and acts at the interface between the mixing water and the cement/aggregate particles to produce microscopic air bubbles, which are evenly distributed throughout the concrete.

Consumption: approx. 0.08 of the weight of cement.

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Conplast AE300 is a chloride-free aerating additive based on a neutralised vinsol resin. It is supplied as a brown solution that instantly disperses in water.

Conplast AE300 acts at the interface between the mixing water and the cement/aggregate particles to produce microscopic air bubbles, which are evenly distributed throughout the concrete.

Uses

  • For the production of aerated concrete to increase durability and resistance to freezing and de-icing salts, reducing surface spalling and concrete cracking problems. Typical applications include roads, bridges, airport runways, and other large areas of concrete exposed to frost damage.
  • To improve the cohesion and workability of concrete mixes with poor fines content and to prevent exudation and segregation.

Advantages

  • Air occlusion improves workability and aids in the production of a dense, uniform, tighter textured, tighter surface, free of gravel concentrations and segregation, resulting in a more durable concrete.
  • The excellent stability of the air bubbles provided allows Conplast AE300 to be used with a wide range of different aggregates and mixing conditions.

Standards

Conplast AE300 complies with UNE-EN 934-2:2010 Table 5 as an air inclusor.

Typical dosage

The optimum dosage of Conplast AE300 to achieve specific requirements should be determined by trials using the materials and conditions that will be tested in practice. This allows optimisation of the admixture dosage and mix and provides a complete assessment of the concrete.

A starting point for such tests is to use a dosage of 0.05 to 0.15 litres per 100 kg of cementitious material, including ash, slag or microsilica.

As an example, a dosage of 0.08 litres/100 kg of cement normally gives an air content of 5% + 1.5% in a medium workability concrete with a cement content of 250 - 300 kg/m3. Where other cementitious materials are used, these should be included in the cement content for the purpose of calculating the admixture dosage. The presence of ash or microsilica may increase the dosage to obtain a particular air content.

In special applications, e.g. extruded, poured or New Jersey concretes, the required dosages may be higher. Consult Fosroc Technical Department.

Properties

  • The following results were obtained at a temperature of 20ºC:
  • Appearance: Light brown liquid
  • Density: 1,005 ± 0,01 kg/l
  • pH: 9,5 ± 1,0
  • Water soluble chloride content (CI-): ≤ 0,10%.
  • Alkali content (Na2O equivalent): max. 1% by mass
  • Primary function: air-locking of concrete
  • Secondary function: Increases workability

Mode of application

Analysis and control

Once the appropriate dosage has been selected, care should be taken to ensure the consistency of the materials used and the mixing and distribution processes. The air content should be analysed regularly.

Factors affecting air occlusion

There are several factors that can affect the air-lock obtained for a particular dosage of air-entraining admixture, such as the type of sand used, the fineness of the cement, the presence of carbon or organic impurities, the temperature of the concrete, the type of mixer, the transit time or compaction.

Consult Fosroc Euco's technical department regarding the changes that these factors may cause in the concrete mix.

Compatibility

Conplast AE300 is only compatible with the superplasticisers of the Fosroc Euco range if the lowest possible w/c ratio is to be maintained. If more than one admixture is used, they should be added to the concrete separately and not mixed together before being added. The resulting properties of concrete containing more than one admixture should be checked by prior testing.

Conplast AE300 is suitable for use with all cements complying with RC-08.

Dosing system

Overdosing twice the normal amount of Conplast AE300 results in a significant increase in occluded air, which reduces resistance. The degree of this effect will depend on the particular mixture and the level of overdosing. This increase in air entrainment caused by overdosing tends to increase the plasticising effect. A slight increase in setting time may also occur.

Curing

The final characteristics of any structural concrete will depend on good curing practice. It is therefore very important to use a curing membrane such as Fosroc Euco Concure, water spray or wet burlap.

Clean-up and disposal

Spills of Conplast AE300 should be absorbed with sand or earth and transferred to suitable containers. Product residues should be flushed away with a large amount of water. Disposal of the product and packaging is the responsibility of the end user.

Limitations

Some substantive cement materials, particularly low grade fly ash, may lead to a significant increase in the required dosage of Conplast AE300 to produce the desired air content.

Storage

Conplast AE300 has a storage life of 12 months if kept in a dry place in its original, sealed containers at a temperature between 2ºC and 40ºC.

Freezing point: 0°C approx.

Precautions

Safety and Hygiene

Conplast AE300 is alkaline and irritant and should not be ingested or put in contact with skin and eyes. Wear protective gloves and goggles. Splashes on the skin should be washed off with water. In case of contact with eyes, flush with plenty of water and seek medical advice. If swallowed, seek immediate medical attention. Do not induce vomiting.

For further information, please refer to the Material Safety Data Sheet.

Fire

Conplast AE300 is water based and non-flammable.

Fosroc
119387

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