Cementitious self leveling, self smoothing compound

This section covers the standard requirements for Flooring Application using GRANDFLOR LEVELLER 10 (Cementitious self leveling, self smoothing compound).
Correct evaluation and subsequent preparation of the existing concrete floor is required to achieve a good performance of the finished floor system. This to both new construction and refurbishment work.
Assessment of existing floor
The first step in the installation of GRANDFLOR LEVELER 10 products is to carry out a detailed survey of the existing floor and an assessment of the service conditions, which will determine the performance characteristics required of the new floor. Any signs of damage, contamination or other defects should be noted and corrected.
Floor strength
A weak substrate can lead to floor topping failure usually due to impact damage or abrasion.
Floor strength should be at least 3,000 psi (210 N/mm2). New concrete floors must normally be at least 14 days old prior to application of GRANDFLOR LEVELER 10 flooring systems.

1)    Surface Preparation Works
   1.1 The substrate must be clean, sound and free from dust, oil, grease or surface contaminants.
    1.2 Removed any cement laitance, formwork traces and loosely bonded particles.
    1.3 New  concrete  should  be  at  least  14  days  before  application  of GRANDFLOR LEVELER 10.
    1.4 Large cracks or holes must be filled using equal volumes of GRANDFLOR LEVELER 10 and clean sand  to trowellable mortar.
2)    Priming
    2.1 All surfaces should be sealed prior to application of GRANDFLOR LEVELER 10.
    2.2   Prime the surface with GRANDCRETE ACR, 1:1 water/Grandcrete ACR mixture by volume. The primer should be allowed to dry to form an impervious barrier  between substrate and the GRANDFLOR LEVELER 10 to improve bond and prevent release of air from the substrate.
    2.3   The second priming of the floor is carried out when the first priming coat is dry.
    2.4    If the floor is extremely porous it may be necessary to prime a third time with the primer diluted at 1:1 ratio with clean water.
    Note: The primer must be well brushed out to avoid ponding of primer because this can lead to failure at the bond line.
    2.5    Once the primer has dried (film formation can be seen on the surface), GRANDFLOR LEVELER 10 product can be applied to the floor.
3)    Mixing
    3.1 Mix 25 kg bag of GRANDFLOR LEVELER 10 with 6.0 to 6.5 liters of clean water.
    3.2 Pour the water into a clean mixing vessel. Add the powder slowly to the water while mixing continuously with a heavy duty drill fitted with purpose made paddle.
    3.3  Continue mixing for at least 3 minutes until a creamy consistency is obtained.
    3.4 Do not mix more GRANDFLOR LEVELER 10 that can be laid in about 15 minutes but ensure that the next mix is ready so that pouring can be continued until the whole area to be applied is complete.
    3.5  No additional water above the normal 6.0 to 6.5 liters should be used.
    3.6 Ensure that sufficient labor is available to enable continuous mixing and pouring.

4)    Application
4.1  Application by pump
4.1.1    Installation should start at a corner with the operator walking slowly at constant rate across the floor, allowing material to flow from the discharge hose.
4.1.2    The hose should be positioned so that the material discharges marginally into the material laid previously.
4.1.3    The maximum bay width which can be applied depends on the temperature, type of mixer pump and the thin flooring products used.
4.1.4    Roll surface with spiked roller to aid air release and leveling. This procedure which aid air release should be carried out immediately after material has been discharged onto the floor. It also provides the final smoothing of the surface layer.
4.2    Application by hand
    4.2.1    Pour the mixed material into the dry primed surface immediately, spread out with trowel and then allow to flow smooth.
    4.2.2    Finish by drawing across the surface of the previously laid material with a spiked roller to aid air release and leveling. Do not over roll. Best results are achieved when the pouring and leveling is a continuous process.
    4.2.3    The required thickness must be achieved in one application.
    1.    Do not attempt to float the setting surface.
    2.    If a mix stiffens before it has been spread, it must be discarded. Do NOT attempt to remix with water.
5)    Curing and Protection
    5.1 Curing should be carried out in conditions of high ambient temperatures, direct sunlight, drying winds, etc. Freshly hardened surfaces should be covered with polythene  sheets  for at least two days.