Sika Sikafloor 280

Sika Sikafloor 280 is a three part epoxy mortar, consisting of an epoxy binder and quartz sand with a maximum grain size of 1.2 mm.

Best Uses

Sika Sikafloor 280 is formulated for use as an epoxy screed with a layer thickness of 2–10 mm. This mortar screed is suitable for heavy mechanical wear environments such as in the metal industry, print shops, loading ramps, etc. Sika Sikafloor 280 is also suitable as a repair mortar for floors and civil structures (e.g. bridges etc.) or embedding of balustrades and nosings etc.

• Very high abrasion resistance
• Very high impact resistance
• High compressive and flexural strength
• High bond strength
• Supplied in pre-batched units
• Efficient and easy application

Application

The concrete substrate must be sound and of sufficient compressive strength (minimum 25 N/mm2) with a minimum pull off strength of 1.5 N/mm2. The substrate must be clean, dry and free of all contaminants such as dirt, oil, grease, coatings and surface treatments, etc. Concrete substrates must be prepared mechanically
using abrasive blast cleaning or scarifying equipment to remove cement laitance and achieve an open textured surface.

Weak concrete must be removed and surface defects such as blow holes and voids must be fully exposed. Repairs to the substrate, filling of blowholes / voids and surface levelling must be carried out using appropriate products from the Sikafloor®, Sikadur® and Sikagard® range of materials. All dust, loose and friable material must be completely removed from all surfaces before application of the product, preferably by brush or vacuum.

Prior to mixing, stir part A mechanically. When all of part B has been added to part A, mix continuously for 3 minutes until a uniform mix has been achieved. When parts A and B have been mixed, add the quartz sand and if required the Extender T and mix for a further 2 minutes until a uniform mix has been achieved. To ensure thorough mixing pour materials into another container and mix again to achieve a consistent mix. Over mixing must be avoided to minimise air entrainment

Prior to application, confirm substrate moisture content, relative humidity and dew point. If substrate moisture content is more than 4 % pbw, Sikafloor® EpoCem® may be applied as a temporary moisture barrier (T.M.B.) system. For strongly absorbent substrates apply a primer coat. The primer has to be cured tack free before the bonding bridge is applied.

Primer:
Make sure that a continuous, pore free film covers the substrate. Apply Sikafloor®-156/-161 by brush, roller or squeegee. Preferred application is by using a squeegee and then backrolling crosswise.

Bonding bridge / impregnation:

Make sure that a continuous, pore free film covers the substrate. Apply Sikafloor®-156/-161 by brush, roller or squeegee. Preferred application is by using a squeegee and then backrolling crosswise.

Mortar screed:
Apply the mortar screed evenly on the tacky bonding bridge, using levelling boards and guide rails as necessary. After a short waiting time compact and finish the
mortar with a trowel or Teflon coated power float (usually 20 - 90 rpm). Power floats can only be used on mortar layers > 8 mm.