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Prerepar S 

High performance mortar for application in rehabilitation and restoration works

Description

PREREPAR S is a one-component fast setting powder mortar, based on Portland cement resistant to sulfates, siliceous aggregates of analyzed grain size, polymers, fibers and admixtures. It is suitable for concrete structural repair due to its high adhesion to steel and concrete.

Technical Data

• Type: Fast setting cement enhanced mortar.
• Aspect: Powder.
• Colour: Grey.
• pH: 12.
• Density of mortar: 2.0 kg/dm³.
• Workability time at 20 ºC: 1 hour.
• Drying time 20oC: 12 hours.
• Max. grain size: 2 mm.
• Application temperature: > 5 ºC.
• Mechanical strength (EN 12190):
• Compressive str. at 24h: > 150 kg/cm².
• Compressive str. at 28d: > 600 kg/cm².
• Flexural str. at 28d: > 80 kg/cm².
• Elasticity modulus: 25.000 N/mm².
• Thickness of application: 4-40 mm.

Features

• High adhesion to the concrete substrate.
• Good workability. Non-bleeding.
• Adequate handling time.
• Non-shrinkage.
• High resistance.
• Can be pumped or projected.

Application procedure

Substrate preparation: The application substrate must be sound, with irregularities bigger than 3 mm (if adherent is not used) and water saturated for at least 6 hours before the application. Eliminate deteriorated concrete or laitance by means of chisel, mechanical means, water under high pressure, etc. until the desired adherence is achieved. (Sand blasting is not always sufficient to obtain a sound and rough surface). The depth of the repair has to be at least 1 cm after the residuals have been eliminated.

The framework oxides must be eliminated and replaced if necessary. Once cleaned, the frameworks are covered with a coat of PREREPAR S 100. If water leakages exist on the surface to treat, these must be eliminated by PRERESEAL 75 PLUG. The surface must be free from any grease residuals, oil stains, paint, mud or dust.

If the repair surface depth is bigger than 20 mm, it will be necessary to attach a rebar to the concrete to treat, leaving some space between the two and ensuring the fixing by means of separators. If the thickness is less than 20 mm, a rebar is not necessary.

Mortar preparation: Mix the mortar, by hand or by mechanical stirring, with water at a rate of 4.5 liters per 25 kg sack for about 2-3 minutes. The substrate must be water saturated, clean and free from friable material.

Curing: Non-shrinkage mortars with these characteristics should always be cured with water or with appropriate curing liquid to avoid the hydration water evaporation. Notwithstanding, even without this curing protection, in normal conditions of application, PREREPAR S forms no fissures unlike other mortars which have not been protected adequately in the first 24-48 hours.

If initial very high resistance is necessary to achieve at a very early age, the following instructions are recommended to follow:

• Store in a place protected from the cold.
• Use hot water for the mixing.
• Start the application in the morning.
• Once applied, the product must be covered with a plastic cover, to protect it from the cold.

Tools cleaning: Tools and application equipments are washed with water immediately after use. If the product hardens, it can only be removed by mechanical means.

Recommended for

• Concrete repair.
• Damaged corners and edges repair.
• Concrete repair in aggressive environment (bridges, marine areas, aggressive waters, etc.).
• Concrete structures repair.
• Prefabricated elements repair.
• Top layers repair.
• Repair of concrete damaged by impact.
• Repair of elements subject to recurring high performance.

Special precautions

This product contains cement. Avoid contact with the eyes and skin. Do not inhale it. Use rubber gloves and goggles. Keep out of children‘s reach.

Do not apply the product at temperatures lower than 5ºC.

Empty packaging must be disposed of according to the local legal environmental regulations.

Consumption

The product yields 2 kg /m²/ mm thickness.

Packaging

The product is supplied in 25 kg bags.

Storage

PREREPAR S must be stored in a dry place, protected from the frost and direct sunlight, in its original unopen containers. Its shelf life is 12 months after the date of manufacturing, provided it is well kept.

Activities where this product appears:

• 03. Repair and Rehabilitation Systems

The information and technical data in this «Product Guide» are indicative and are subject to change without notice. Are based on ourexperience and knowledge and customary uses and applications of the product. The specified values may suffer some variationsdepending on: conditions of entry into work, manufacturing tolerances, testing, etc. For this reason, our warranty is limited to thequality delivered.For further expansion or consult our Technical Department.
This information supersedes all previously issued.