Sika® Chapdur® Premix

VOC Content < 0 g/L

Blend of high grade mineral aggregates mixed with cement, admixtures and pigments.

12 months from date of production if stored properly in original unopened packing.

Original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5°C and +30°C.

~ 1.4 kg/I.

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

> 375%    Compared to C25 concerete    ( CS17 , 1000 Cycle , 1000g )      ASTM D4060 

77 N/mm2                                                                    ASTM C579 Method B

> 1.5 N/mm2                                                                    Pull Off Test

4.83%                                                                                      ASTM C413

+5°C min. / +35°C max.

30% r.h. min. / 98% r.h. max.

+5°C min. / +35°C max.

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 to 5.0 kg/m², yielding a surface strengthening coat of approx.  2  -  3  mm thickness.

• 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 25 N/mm2.
• Use of Sikament® or super plasticisers is advised to ensure the optimum quality of concrete , their optimum dispersion within the mix.
• The concrete should contain an adequate proportion of cement (300-350 kg/m³) and the slab should be at least 12 cm thickness for the best result.
• Flatten out the freshly poured concrete with a vibrating beam. As soon as its plasticity permits, smooth the concrete preferably using a mechanical trowel.
• Air Entrained Concrete is not a suitable substrate for the application of dry shake hardeners.

The concrete should Contain an adequate proportion of cement. It is recommended to add a suitable Sika® concrete admixture to improve its properties (e.g. Sikament®).

Level the freshly poured concrete by means of a vibrating beam. As soon as the plasticity permits, smooth the concrete preferably by using a mechanical trowel.

Broadcasting of Chapdur PremixBroadcasting of Chapdur Premix :

The concrete slab is ready for the Chapdurs cement coating when a thumb pressed hard onto the surface only leaves a ‘print’ of about 3 - 5 mm depth.

Broadcast the mix evenly by hand or with suitable device. Apply approx. 3.0 to 5.0 kg/m2

Compaction :

Wait until the Chapdur-Premix has been evenly moistened by the water in the concrete. Use a low rpm mechanical trowel, held perfectly flat.

Note:

If parts of the surface come loose or if the laitance rises, this means the concrete is still too fresh.

Smoothing :

As soon as the plasticity or initial set allows, perform preliminary smoothing with the same machine running at low speed but equipped with metal smoothing blades, set at minimum angle.

Any final smoothing required should be performed later with the machine running at high speed.

The Sika Chapdur® -Premix surface must be protected to prevent early dry-out, crazing and bloom.

Immediately after smoothing, apply a coat of curing compound (Antisol -  90)  on the concrete (dosage approx. 100 – 150gr/m2).

Joints:
Floor joints should be sawed out with a light saw within 1-7 day(s) after application according to the ambient temperature.

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