Sikafloor®-81 EpoCem®
Sikafloor®-81 EpoCem® is a 3-part, epoxy modified cementitious, fine textured mortar for self-smoothing floor screeds in thin layers of 1.5 to 3 mm.
- Can be overcoated with resin based floor finishes after 24 hours (+20°C, 75% r.h.)
- Prevents osmotic blistering of resin based coatings over damp substrates
- Economical and fast, easy application
- Concrete repair mortar: EN 1504-3:Class R4
- Good levelling properties
- Impervious to liquids, but permeable to water vapour
- Frost and de-icing salt resistant
- Good chemical resistance
- Thermal expansion properties similar to concrete
- Excellent bond to green or hardened concrete whether damp or dry
- Excellent early and final mechanical strengths
- Excellent resistance to water and oils
- Ideal preparation for smooth surface finishes
- Will not corrode reinforcement steel
Usage
Sikafloor®-81 EpoCem® may only be used by experienced professionals. As a Temporary moisture barrier (TMB) (min. 2 mm thick) allowing the application of Sika® Epoxy, Polyurethane and PMMA* resin floors requiring dry substrates, over high moisture content substrates even green concrete, for a lasting solution. As a self-smoothing screed for:- Levelling or patching horizontal concrete surfaces, in new work or repairs, in aggresive chemical environments
- Floor topping on non-ventilated damp substrates without particular aesthetic requirements
- Levelling layer under Sika® Epoxy, Polyurethane and PMMA* floor coatings / screeds, tiles, sheet floors, carpets or wooden floors
- Repair and maintenance of monolithic and vacuum concrete floors
Advantages
- Can be overcoated with resin based floor finishes after 24 hours (+20°C, 75% r.h.)
- Prevents osmotic blistering of resin based coatings over damp substrates
- Economical and fast, easy application
- Concrete repair mortar: EN 1504-3:Class R4
- Good levelling properties
- Impervious to liquids, but permeable to water vapour
- Frost and de-icing salt resistant
- Good chemical resistance
- Thermal expansion properties similar to concrete
- Excellent bond to green or hardened concrete whether damp or dry
- Excellent early and final mechanical strengths
- Excellent resistance to water and oils
- Ideal preparation for smooth surface finishes
- Will not corrode reinforcement steel
Packaging
| Part A | 1,14 kg |
| Part B | 2,86 kg |
| Part C | 19 kg |
Colour
| Part A: | white, liquid |
| Part B: | transparent yellowish, liquid |
| Part C: | natural grey aggregate, powder |
| Colour: | light grey |
| Finish colour: | matt |
Ral colours, please inquire Sika
In case of bright colour shades, e.g. yellow or orange, colour deviations may occur due to backfilling with quartz sand. Under direct sun radiation there may be some discolouration and colour deviation; this has no influence to the function and performance of the coating.
Product Details
APPROVALS / CERTIFICATES
- ITT reports (*) for EN 1504-2 Ref. 09/349-963, dated May 6th 2009 and EN 1504-3 Ref. 09/351-965 dated May 4th, 2009 by Applus Laboratory, Barcelona, Spain. *confirm with producing company
- Epoxy modified cementitious mortar for self-smoothing floor screeds according to EN 1504-2: 2004, EN 1504-3: 2005 and EN 13813:2002, DoP 02 08 02 01 001 0 000001 1001, certified by Factory Production Control Body No. 2116 and provided with CE-mark.
- JC/T 984
Composition
Epoxy modified cementitious mortar
Shelf life
| Part A and Part B: | 12 months |
| Part C: | 9 months |
Storage conditions
The product must be stored in original, unopened and undamaged packaging in dry conditions at temperatures between +5 °C and +30 °C.
| Part A and part B: | Protect from frost |
| Part C: | Protect from humidity |
Density
| Part A | ~1,05 kg/l |
| Part B | ~1,03 kg/l |
| Resin mixed | ~1,72 kg/l |
| Parts A+B+C mixed | ~2,10 kg/l |
All Density values at +20 °C.
Volatile organic compound (VOC) content
| < 60 g/L |
Compressive strength
| Time | +23°C / 50% r.h. |
| 1 day | ~15 MPa |
| 7 days | ~50 MPa |
| 28 days | ~60 MPa |
Tensile strength in flexure
| Time | +23 °C / 50 % r.h. |
| 1 day | ~5,8 N/mm2 |
| 7 days | ~11.1 N/mm2 |
| 28 days | ~14 N/mm2 |
Service temperature
-30 °C to +80 °C for continuous exposure.
Chemical resistance
The Sikafloor® EpoCem® product range has improved chemical resistance over plain concrete in aggresive environments, but is noy designed as a chemical protection. For specific chemical resistance, always overcoat with a suitable product of the Sikafloor® range. For occasional exposure or spillages, please consult Sika Technical Services department.
Reaction to fire
| Class A2(fl) | (EN 13501-1) |
Application
Mixing ratio
Part A : Part B : Part C - packing size : 1,14 : 2.86 : 19 kg
Flooring Screed:
At temperatures between +12°C to +25°C:
1 : 2.5 : 17 (by weight)
Parts (A+B) : C = 4 kg : 19 kg
At temperatures between +8°C to +12°C and +25°C to +30°C:
The amount of Part C can be reduced to 18 kg in order to improve workability.
Never reduce Part C by more than this amount.
1 : 2.5 : 15.8 (by weight)
Parts (A+B) : C = 4 kg : 18 kg
For this application, to achieve a good bond of the mortar to the substrate, SikaTop® -Armatec® -110 EpoCem® must be used as bonding bridge. Apply the mortar wet on wet to the primer.
Layer thickness
1.5 mm min. / 3.0 mm max.
If Sikafloor®-81 EpoCem® is used as a Temporary moisture barrier (TMB), a minimum of 2 mm must be applied.
Ambient air temperature
+8 °C min. / +30 °C max.
Relative air humidity
20 % min. / 80 % max.
Dew point
Beware of condensation!
The substrate and uncured floor temperature must be at least 3°C above the dew point to reduce the risk of condensation or blooming on the floor finish.
Substrate temperature
+8 °C min. / +30 °C max.
Substrate moisture content
Can be applied on green or damp concrete, without any standing water.
Pot Life
| Temperature | Time |
| +10 °C | ~ 40 minutes |
| +20 °C | ~ 20 minutes |
| +30 °C | ~ 10 minutes |
23 kg units
Waiting time to overcoating
Before applying Sikafloor®-81 EpoCem® on Sikafloor®-81 EpoCem® (A+B) allow:
| Substrate temperature | Minimum | Maximum |
| +10 °C | ~ 12 hours | ~ 72 hours |
| +20 °C | ~ 6 hours | ~ 48 hours |
| +30 °C | ~ 4 hours | ~ 24 hours |
Sikafloor®-81 EpoCem® can be overcoated with vapour tight coatings when the surface humidity falls below 4%! Not ealier than:
| Substrate temperature | Minimum |
| +10 °C | 2 days |
| +20 °C | 1 day |
| +30 °C | 1 day |
Times are approximate at 75% r.h. and will be affected by changing ambient and substrate conditions, particularly temperatures and relative humidity.
Consumption
Self-smoothing screed:
| Coating system | Product | Consumption |
| Primer: | Sikafloor®-81 EpoCem® (A+B) | 2 x 0.1-0.2 kg/m2/layer |
| Surface coating: | Sikafloor®-81 EpoCem® (A+B+C) | ~ 2,25 kg/m2/mm (for T.M.B at least 2mm) |
These figures are theoretical and do not allow for any additional material due to surface porosity, surface profile, variations in level or wastage, etc.
EQUIPMENT
Mix using a slow speed electric mixer (300–400 rpm) with helical paddle or other suitable equipment.
Recommended are single or counter rotating double mortar (basket type) and forced action (pan type) mixers. Free fall mixers must not be used.
MIXING
Part A : Part B : Part C - packing size : 1,14 : 2.86 : 19 kg
Flooring Screed:
At temperatures between +12°C to +25°C:
1 : 2.5 : 17 (by weight)
Parts (A+B) : C = 4 kg : 19 kg
At temperatures between +8°C to +12°C and +25°C to +30°C:
The amount of Part C can be reduced to 18 kg in order to improve workability.
Never reduce Part C by more than this amount.
1 : 2.5 : 15.8 (by weight)
Parts (A+B) : C = 4 kg : 18 kg
For this application, to achieve a good bond of the mortar to the substrate, SikaTop® -Armatec® -110 EpoCem® must be used as bonding bridge. Apply the mortar wet on wet to the primer.
APPLICATION
Prior to mixing, shake part A (white liquid) briefly until homogenous, then pour into container of part B and shake vigorously again for at least 30 seconds. When dosing out of drums, stir and homogenise first. Pour the mixed binder mixture (A+B) into a suitable mixing container (capacity of about 30 litres) and gradually add part C to the mixer while stirring with a power mixer. Mix thoroughly for 3 minutes until a uniform mix has been achieved.
When dosing with additional aggregates, add them after adding part C to the mix.
Mix thoroughly for 3 minutes until a uniform mix has been achieved.
CLEANING OF EQUIPMENT
Clean all tools and application equipment with water immediately after use. Hardened / cured material can only be removed mechanically.