New generation additive with great water-reducing power without loss of workability or performance. It allows the production of very fluid concretes.

Uses

• For making wet sprayed concrete.
• Specially designed for use as a single-product admixture in ready-mixed plant concrete.
• For all types of concrete requiring a normal workability period, high early strength and high performance.
• Very versatile admixture, suitable for use in synergy.

Advantages

• Significant improvement of both initial and final mechanical strengths.
• High water reducing power.
• Provides the concrete with excellent workability maintenance.
• Provides a stable and robust concrete avoiding large fluctuations in workability when little water is added.
• Allows the production of extremely fluid concretes for use on site without the need for vibration.

Standards

Complies with UNE-EN 934-2:2010 Tables 3.1. and 3.2. as a high activity water reducer/superplasticiser.

Typical dosage

To achieve specific requirements for Structuro 351, the optimum dosage should be determined by tests using the materials and conditions that will be tested in practice.

The dosage can range from 0.5 to 2% s.p.c. For flowable concrete the average dosage would be approximately 0.7%.

Properties

These results were obtained at a temperature of 20ºC:

• Appearance: Light brown liquid
• Density: 1,058 ± 0,01 kg/l
• pH: 6.5 ± 1.0
• Water soluble chloride content (CI-): ≤ 0,10%.
• Alkali content (Na2O equivalent): max. 2 % by mass
• Main function: Decrease water content. Increase workability
• Secondary function: To increase initial and final strengths.

Mode of use

Mixing design

Once the appropriate dosage has been determined, care must be taken to ensure the consistency of the materials used and the mixing and distribution processes.

Compatibility

This admixture 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.

It is suitable for use with all cements that comply with the RC-08 standard.

Dosing system

The correct quantity of admixture must be measured by means of a suitable dosing system. For best results, the admixture should be added to the concrete in the mixing water or directly in the mixer. In this case, increase the setting time. Contact the Fosroc Euco Technical Department for advice on the appropriate dosing equipment and its installation.

Effects of overdosage

An overdosage of twice the maximum dosage indicated may cause delayed setting of the concrete as well as additional air entrapment.

Curing

Good curing should generally be achieved in structural concrete, particularly in situations where overdosage has occurred. A Fosroc Euco Concure curing membrane, water (sprayed) or wet burlap should be used.

Clean up and disposal

Spillage of Structuro 351 should be absorbed with sand or earth and transferred to suitable containers. Product residues should be flushed away with large quantities of water. Disposal of the product and packaging is the responsibility of the end user.

Storage

Shelf life is 12 months if kept in a dry place in its original, sealed containers at a temperature between 2ºC and 40ºC. The colour of the additive may change over time, without affecting the properties of the additive.

Precautions

Safety and hygiene

Not to be ingested or in contact with skin and eyes. Wear protective gloves and goggles. Splashes on skin should be washed off with water. In case of contact with eyes, rinse immediately 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

Not flammable.