Sika® Chapdur IN

Natural mineral aggregates graded and mixed with cement, admixtures and pigments

12 months from date of production

The product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +10 °C and +30 °C

1.5 ± 0.1 kg/L at +27 °C

2.5–3.0 mm at dosage of ~5.0 kg/m²  

+5 °C min. / +35 °C max.

30% min. / 98% max.

+5 °C min. / +35 °C max.

The above values are at substrate temperature of +27 °C and dependant upon the concrete reaching its design strength for serviceability and will be affected by changing ambient conditions, particularly temperature and relative humidity.

• The concrete deliveries must be of consistent quality.
• A concrete slump in the range 75 to 110 mm will normally give best results.
• The slab must be of good quality concrete with a minimum water/cement ratio consistent with the production of a fully compacted slab.
• The compressive strength must be a minimum of 20 N/mm².
• Use of Sikament® or Sika® Viscocrete® super plasticisers is advised to ensure the optimum quality of concrete and where fibers are used, their optimum dispersion within the mix.
• Air Entrained Concrete is not a suitable substrate for the application of dry shake hardeners.

Application time for dryshake products is influenced by every variable which affects the placing of concrete, and can therefore vary substantially, depending on the prevailing conditions.

Dependent on the conditions, remove the surface bleed water or allow it to evaporate. Sprinkle Sika® Chapdur IN onto the screed concrete evenly in 2 stages, first stage 60% and second stage 40%. Care must be taken to apply the product without creating ripples etc. in the concrete surface. The first application must be worked into the slab immediately followed by application of the second stage quantity of Sika® Chapdur IN. Final finishing, closing pores and removing undulations can be achieved either by hand or powered trowel.

Please also note:

• Never add water to the surface where the dry shake has been applied.
• Sika® Chapdur IN results in the slab surface becoming stiff more quickly than usual. Careful trimming must take place along the edges where adjoining slabs are to be poured.

Periodical checking of the condition and development of the concrete will determine the correct time frame for each stage and sequence of application.

For mechanical application with automatic spreader and laser screed, the spreading can start almost immediately after the concrete has been levelled to allow for the hydration of the dryshake. Compaction with the trowel can start as soon as the weight of the power trowels is supported by the concrete.

For manual application, the dryshake must be spread once the concrete can be stepped on, without leaving a print deeper than 3–5 mm.

Cure Sika® Chapdur IN immediately after finishing using clean water. For chemical curing, please consult Sika Technical Service team.

To maintain the appearance of the floor after application, Sika® Chapdur IN must have all spillages removed immediately and must be regularly cleaned using rotary brush, mechanical scrubbers, scrubber dryer, high pressure washer, wash and vacuum techniques, etc., using suitable detergents and waxes.