Sika® Chapdur® Extra

Confirms to the requirements of EN 13813-CT-C70-F7-AR0.5, Declaration of Performance and provided with CE-marking.

Blend of natural and synthetic aggregates mixed with cement, admixtures and pigments.

12 months

Store properly in undamaged original sealed packaging, in dry cool conditions

~ 2,3 ± 0.05 kg/l

2 mm

Use products mentioned below as indicated in their respective Product Data Sheets.
 

Substrate:

• Fresh concrete slab (See Substrate Quality below).

Dry shake:

• Manual or machine application of Sika® Chapdur Extra
• Dry shake application by dispensing trolley or laser screed
• Final smoothing with power trowel.

Curing compound:    

• Sikafloor® ProSeal-12, Sikafloor® ProSeal-22, Sikafloor® ProSeal-10 W.

A1_fl

+5°C min. / +35°C max.

+5°C min. / +35°C max.

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

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 dry shake. Compaction with the trowel can start as soon as the weight of the power trowels is supported by the concrete.

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

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

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

~ 3.0-5.0 kg/m². This figure does not allow for surface profile and wastage.

• The concrete deliveries must be of consistent quality and meet requirements of EN 206-1.
• Concrete characteristics are specified by its class determined in the static design and by general recommendations for concrete mixture formulation. Typical concrete classes for armoured concrete floors are specified minimally as C20/25 (B25) or C25/30 (B30) exceptionally even as C30/37 (B35).
• Use of Sikament® or Sika Viscocrete® super plasticisers is advised to ensure the optimum quality and workability of concrete and where fibres are used, their optimum dispersion within the mix.
• Air Entrained Concrete is not a suitable substrate for the application of dry shake hardeners.

i) Mechanical Application - Automatic spreader in conjunction with a laser screed:

• Spread Sika® Chapdur® Extra evenly onto the concrete immediately after screeding at ~ 3.0- 5.0 kg/m² in one application.

(ii) - Manual application:

• Dependent on the conditions, remove the surface bleed water or allow it to evaporate.
• Sprinkle Sika® Chapdur® Extra onto the screeded concrete evenly in 2 stages (first stage: 3 kg/m²; second stage: 2 kg/m²). The first application must be worked into the slab followed immediately by the application of the second stage quantity of Sika® Chapdur® Extra.
• Care must be taken to apply the product without creating ripples etc. in the concrete surface. Overall application rate 5 kg/m². Casting Sika® Chapdur® Extra powder carelessly or further than 2 metres from point of casting will reduce the consistency of finish.

For more information please refer to Method Statement.

Notes:

• Never add water to the surface where the dry shake has been applied.
• Sika® Chapdur® Extra 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.
• Final finishing to close pores and remove undulations can be achieved either by hand or powered trowel.

• Cure and seal Sika® Chapdur® Extra immediately after finishing using any of the products from Sikafloor® ProSeal range (Refer to separate Product Data Sheet).
• Apply by roller of fine mist spray.
• Disperse any excess pools using a roller.

Joints:

• After finishing operations and completing saw cuts, clean off any residual saw lubricant / slurry without delay. Joints can be filled with Sikaflex® PRO-3 or another appropriate Sikaflex® sealant in accordance with the floor design requirements.

Clean all tools and application equipment with water immediately after use. Hardened / cured material can only be removed mechanically.

To maintain the appearance of the floor after application, Sika® Chapdur Extra 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.