Sika MonoTop-615 is an R3 cementitious high build concrete repair mortar and one of the highlights in our Concrete Repair and Protection range. A one component cement based polymer, this product has been modified to function as a high build repair and reprofiling mortar for a variety of R3 applications as well as in place of R1& R2 mortars.
Perfect for both vertical and overhead repairs, Sika MonoTop 615 can be applied by hand or by using a spray gun. The concrete repair mortar is suitable for exterior and interior use on all types of structures.
Sika MonoTop615 is high build, creates low levels of wastage and does not contain any chloride admixtures. The repair mortar is sold pre-bagged to guarantee the highest quality and is ready to apply just after adding water. As an alternative to hand application, Sika MonoTop 615 can be wet sprayed onto substrates.
When stored in cool and dry conditions, sealed Sika MonoTop-615 bags have a maximum shelf-life of nine months from their production date.
Sika MonoTop615 can be mixed with a slow speed (< 500 rpm) electric drill mixer or by hand if you are applying very small quantities. To reach the required consistency, pour the required amount of water into a suitable mixing container and stir the powder in slowly, mixing thoroughly for at least three minutes.
When applying Sika MonoTop-615 to concrete substrates, ensure the surface is thoroughly cleaned and free of any surface contaminants, such as dust and loose material, to avoid reducing the bond or preventing suction or wetting by repair materials. You should also check that the substrate is clear of rust, scale, mortar and concrete if you are using Sika MonoTop615 for steel reinforcement.
Depending on whether you are applying the concrete by hand or using a spray gun, the application method for Sika MonoTop-615 will vary slightly.
Start by making sure the substrate is thoroughly wetted for a minimum of two hours prior to application and removing any excess damp with a cloth or a sponge.
If you are applying Sika MonoTop615 by hand, work the repair mortar into a pre-wetted substrate, compacting it with a trowel or gloved hand. Manual application also means you should add a scratch coat to the substrate.
Take care to avoid the formation of air pockets. Similarly, during a sprayed application, ensure there’s no loose rebound material or any voids when placing the repair mortar onto the pre-wetted substrate.
Do not allow the material to dry completely during application (for either of the application methods). If too much time has passed between layers, use a bonding primer such as Sika MonoTop-610 or SikaTop Armatec-110 EpoCem before continuing with the application of the repair mortar to achieve the desired “wet on wet” conditions.
Whether you are using hand or spray application, finish the surface to the required texture as soon as mortar begins to stiffen. We recommend using a float, as excess trowelling might create surface cracks.
We also advise that you use water to clean all tools and application equipment immediately after use. Leaving the material to harden or cure on the tools means you’ll need to remove it mechanically.
Cure the repair mortar immediately after application for a minimum of 3 days to minimise cracks and ensure full hydration of the cement. Approved methods include taping down polythene sheeting at the edges. We wouldn’t recommend using any curing compounds which may adversely affect the subsequent application of other products and systems.
Apply Sika MonoTop615 away from direct sun, strong wind and/or rain. When the repair mortar is freshly applied, take care to protect the material from freezing. Avoid adding water over recommended dosage and make sure to only apply to sound substrates clean from debris.
When it comes to the surface finishing, we advise against adding extra amounts of water, as this can lead to discoloration and cracking.