Conheft

PRE-TREATMENT

1.1 Pre-treatment of substrate – concrete:

The substrate must be clean and free of dust, grease, chlorides and other impurities that can impair adhesion. In the case of methods for pre-treating substrates that can lead to joint damage near the surface of remaining old concrete, e.g. chiseling, tapping, milling, blasting, the treated surfaces must be finished with, e.g. high-pressure washing. The concrete substrate should have a roughened and raw surface with densely occurring irregularities with an average of -1 mm. Tensile strength average value in the substrate should be >1 N/mm2 and the concrete quality should be at least C30/37. The connecting edges of the damaged area should be perpendicular to prevent the repair from loosening. Water the substrate sufficiently at intervals during 24 hours before applying the product, watering is required at least 2 hours before applying Bemix Conheft. Water used must be clean drinking water. Before application, remove excess water, e.g. with a clean sponge. The surface must have a dark matt appearance without shine, surface pores and pits must not contain water, condensation water must not be on the surface as it can impair adhesion. The substrate must be saturated with water but in a surface dry state.

1.2 Pre-treatment of substrate – steel reinforcement:

Rust, mortar, concrete, dust, chlorides and other loose or harmful material that reduces adhesion or contributes to corrosion must
be removed from the steel reinforcement using a suitable method and degree of cleanliness.

MIXTURE

Use a high-speed mixer when mixing. Measure the water with a measuring vessel or weigh the water to obtain a high quality of the end product in accordance with the technical data. The temperature of the finished mass should always be 20 °C.

1. Pour water and add dry mortar

2. Mix for about 3 minutes

3. Leave to mature for about 2 minutes

4. Mix again for about 0.5 minutes. Stir the material again if necessary. It is not perrnitted to add more water when stirring.

TOOL

Conheft is applied with a suitable tool, steel trowel, grinding steel, repair trowel, trowel or a harder brush.

PROCESSING

The surface is only processed when the material has stiffened a little. Depending on the desired aesthetics or function on the surface, the mill is processed by e.g. felting, slathering with a coarse brush/brush, smoothing or scraping. The putty strokes can be smoothed with a slightly moistened sponge or brush on the slightly damp mortar.

AFTER TREATMENT OF THE SURFACE

Free and unprotected surfaces are protected immediately after casting so that shrinkage and desiccation cracks do not occur. Prevent rapid drying out from sun, wind, heat radiation, etc. with a protective cover, make sure that plastic/covering foil does not touch the surface of the mortar. Re-water if necessary after the surface has been protected for the first day. Afler 2-3 days, the covering is removed and re-watering is completed so that drying and film formation can take place.

INFORMATION!

To early rewatering can negatively affect the surface and the color can become more flaming, a completely even color tone on the surface of the mortar is not possible. lf Bemix Conhefl is exposed to dripping water, rain or drizzle before sufficient curing is achieved, depending on the temperature and humidity, white lime deposits may appear as streaks or spots on the surface. Lime deposits decrease over time. For specific requirements on carrying out repairs, refer to EN 1504-10