Sikafloor®-81 EpoCem®
Epoxy-cement hybrid multipurpose flooring mortar and self-smoothing screed (1.5–3.0 mm)
Sikafloor®-81 EpoCem® is a 3-part, epoxy modified cementitious, multipurpose flooring mortar.
- Can be overcoated with resin based floor finishes after 24 hours
- Prevents osmotic blistering of resin based floor finishes on damp substrates
- Fast and easy application
- Concrete repair mortar: EN 1504-3:Class R4
- Good levelling properties
- Impervious to liquids, permeable to water vapour
- Freeze thaw and de-icing salt resistant
- Good chemical resistance
- Thermal expansion properties similar to concrete
- Good bond to green or hardened concrete whether damp or dry
- Good early and final mechanical strengths
- Good resistance to water and oils
- Suitable surface for overlaying smooth floor finishes
- Low VOC emissions
- Will not corrode reinforcement steel
Usage
On interior industrial flooring cementitious substrates including vacuum dewatered concrete floors as a: Temporary moisture barrier (TMB)- Allows the application of Sika® Epoxy, Polyurethane and PMMA resin floors onto high moisture content substrates or green concrete
- Levelling or patch repairing horizontal floors for new, refurbishment or maintenance works
- Unaesthetic floor topping on non-ventilated damp substrates
- Levelling layer under Sika® Epoxy, Polyurethane and PMMA flooring systems, tiles, carpets, laminate, wooden, linoleum and vinyl sheet flooring
- Repairing the substrate before application of Sika® Epoxy, Polyurethane and PMMA flooring systems
- Suitable for moisture control (Principle 2, method 2.3 of EN 1504-9)
- Suitable for physical resistance (Principle 5, method 5.1 of EN 1504-9)
- Suitable for restoration work (Principle 3, method 3.1 of EN 1504-9).
- Suitable for preserving or restoring passivity (principle 7, method 7.1 and 7.2 of EN 1504-9).
- Suitable for increasing resistivity (Principle 8, method 8.3 of EN 1504-9)
Advantages
- Can be overcoated with resin based floor finishes after 24 hours
- Prevents osmotic blistering of resin based floor finishes on damp substrates
- Fast and easy application
- Concrete repair mortar: EN 1504-3:Class R4
- Good levelling properties
- Impervious to liquids, permeable to water vapour
- Freeze thaw and de-icing salt resistant
- Good chemical resistance
- Thermal expansion properties similar to concrete
- Good bond to green or hardened concrete whether damp or dry
- Good early and final mechanical strengths
- Good resistance to water and oils
- Suitable surface for overlaying smooth floor finishes
- Low VOC emissions
- Will not corrode reinforcement steel
Packaging
Pre-batched 21 kg × 2 units.
| Part A | 1.05 kg container × 2 |
| Part B | 2.63 kg container × 2 |
| Part C | 17.32 kg bags × 2 |
Colour
Final floor appearance: Smooth, matt finish
| Part A - resin | white liquid |
| Part B - hardener | translucent white liquid |
| Part C - filler | off white aggregate powder |
| Final floor finish colour | light grey |
Product Details
APPROVALS / STANDARDS
- Migration test EN 23270, Sikafloor®-81 EpoCem, kiwa, Report No. P 8740a
- Water permeability test DIN 1048-5, Sikafloor®-81 EpoCem, Polymer Institut, Report No. P 3439
- Fire testing EN 13501-1, Sikafloor®-81 EpoCem, MPA Dresden, Report No. 041706
- Fire testing EN 13501-1, Sikafloor®-81 EpoCem, Hoch, Report No. KB-Hoch-170138
- Sliding test DIN 51130, Sikafloor®-264 N, Roxeler, Certificates No. 020044-17-7, 020044-17-7a, 020044-17-8a
Product declaration
EN 1504-2 - Surface protection product for concrete - Coating
Complies with the general requirements of EN 1504-3: Class R4
EN 13813 - Resin screed material for internal use in buildings
Chemical base
Epoxy modified cementitious mortar
Shelf life
| Part A and Part B | 12 months from date of production |
| Part C | 09 months from date of production |
Storage conditions
The product must be stored in original, unopened and undamaged packaging in dry conditions at temperatures between +5 °C and +30 °C. Always refer to packaging.
Density
| Part A | ~1.08 kg/L |
| Part B | ~1.03 kg/L |
| Parts A+B+C mixed | ~2.10 kg/L |
All density values at +30 °C.
Compressive strength
| Time | Compressive strength |
| 1 day | ~20 N/mm2 |
| 7 days | ~45 N/mm2 |
| 28 days | ~50 N/mm2 |
Values +23 °C / 50 % r.h.
Flexural strength
| Time | Flexural strength |
| 1 day | ~8 N/mm2 |
| 7 days | ~10 N/mm2 |
| 28 days | ~13 N/mm2 |
Values at +23 °C / 50 % r.h.
Coefficient of thermal expansion
| 15.2×10-6 1/K | (EN 1770) |
Service temperature
-30 °C to +80 °C for continuous exposure.
Water absorption
| 0.02 kg·m-2·h-0.5 | (DIN 52617) |
Permeability to water vapour
| µH2O = 252 Equivalent air layer depth for 3 mm thickness: Sd = 0.75 m | (DIN 52615) |
Permeability to carbon dioxide
| µC02 ≈ 4168 | (SN EN 1062-6) |
Chemical resistance
Resistant to many chemicals. Contact Sika Technical Services for additional information.
Freeze thaw de-icing salt resistance
| Resistance factor WFT-L 98 % (High) | D-R (SN / VSS 640 461) |
Carbonation resistance
Carbonation resistance for 3 mm thickness: R ≈ 12.5 m
Reaction to fire
| A2(fl) S1 | (EN 13501-1) |
Application
Mixing ratio
Packaging size:
Part A : Part B : Part C = 1.05 : 2.63 : 17.32
TMB and Self-smoothing screed
| Temperature | Mixing Ratio by weight |
| +12 °C min. / +25 °C max. | Part A : Part B : Part C = 1 : 2.5 : 17 Parts (A+B) : Part C = 4 kg : 19 kg |
| +8 °C min. / +12 °C max. +25 °C min. / +30 °C max. | Parts (A+B) : Part C = 4 kg : 18 kg To improve workability, Part C can be reduced to 18 kg. Never reduce Part C to less than 18 kg |
Concrete patch repair mortar
The standard Sikafloor®-81 EpoCem® mix can be bulked out with dry quartz sand.
For each 21 kg unit of mixed Sikafloor®-81 EpoCem® add 4–8 kg of: (quartz sand 0.7–1.2 mm) and (quartz sand 2.0–3.0 mm) Final mix will be: 32–41 kg
Layer thickness
| Temporary moisture barrier (TMB) | 2.0 mm min. |
| Self-smoothing screed | 1.5 mm min. / 3.0 mm max. |
| Concrete patch repair mortar maximum surface area ~3 × 5 cm | 3.0 mm min. / 9.0 mm max. |
Ambient air temperature
+8 °C min. / +30 °C max.
Relative air humidity
20 % min. / 80 % max.
Substrate temperature
+8 °C min. / +30 °C max.
Substrate moisture content
Can also be applied on green or damp concrete with no standing water. Although the system can be applied onto green concrete surfaces (> 24 hours), it is advised to allow at least 3 days for early concrete shrinkage to occur in order to prevent shrinkage cracks from appearing on the TMB / screed surface.
Pot life
| Temperature | Time |
| +10 °C | ~40 minutes |
| +20 °C | ~20 minutes |
| +30 °C | ~10 minutes |
21 kg units, values at 75 % r.h.
Curing time
Once Sikafloor®-81 EpoCem® is tack free it is possible to apply vapour permeable resin finishes.
For the application of vapour tight resin finishes on Sikafloor®-81 EpoCem®, allow the substrate moisture content to fall below 4 % and not earlier than:
| Substrate temperature | Waiting time |
| +10 °C | ~48 hours |
| +20 °C | ~24 hours |
| +30 °C | ~24 hours |
Consumption
| TMB and Self-smoothing screed: Sikafloor®-81 EpoCem® | ~2.25 kg/m2/mm |
| Concrete patch repair mortar: Sikafloor®-81 EpoCem® | ~2.4 kg/m2/mm |
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
Select the most appropriate equipment required for the project:
Substrate preparation
- Abrasive blasting cleaning equipment
- Planing machine
- Scarifying machine
- High pressure water blasting equipment
-
Mechanical hand held tools for breaking out concrete
For other types of preparation equipment, contact Sika Technical Services
Mixing
- Electric single or double paddle mixer (300–400 rpm) with helix paddle
- Forced action / rotating pan / double paddle or trough type mixer (300–400 rpm).
- Scraper
- Clean mixing containers
For other types of mixing equipment, contact Sika Technical Services
Application: TBM & Self-levelling screed
- Mixed material carrier
- Pin leveller
- Trowels
- Spiked roller
- Squeegee
- Fleece rollers
Application: Concrete patch repairs
- Plasterers hawk
- Trowel
Finishing
- Trowel (PVC or wooden)
- Sponge
MIXING
TMB and Self-levelling screed
Prior to mixing, shake Part A (white liquid) briefly until uniformly mixed. Then pour into Part B container and shake vigorously for at least 30 seconds. When dosing out of drums, uniformly mix Parts A and B separately before mixing together.
Pour the mixed binder mixture (Parts A+B) into a suitable mixing container (capacity ~30 litres). Using an electric single or double paddle mixer or other similar equipment, gradually add Part C. Mix for a further 3.0 minutes until a uniform lump free mix has been achieved. Mix full units only. Do not add water. Mixing time for A+B = ~30 seconds. A+B+C = ~3.0 minutes 30 seconds.
Concrete patch repair mortar
Prior to mixing, shake Part A (white liquid) briefly until uniformly mixed. Then pour into Part B container and shake vigorously for at least 30 seconds. When dosing out of drums, uniformly mix Parts A and B separately before mixing together.
Pour the mixed binder mixture (Parts A+B) into a suitable mixing container (capacity ~30 litres). Using an electric single or double paddle mixer or other similar equipment, gradually add Part C. Mix for a further 3.0 minutes until a uniform lump free mix has been achieved. When Parts A+B+C have been thoroughly mixed, gradually add the additional aggregates in the required quantities. Mix for a further 3.0 minutes until a uniform mix has been achieved. Mix full units only. Do not add water. Mixing time for A+B = ~30 seconds. A+B+C = ~3.0 minutes 30 seconds. A+B+C+ aggregate = ~6.0 minutes 30 seconds.
APPLICATION
TMB and SELF- LEVELLING SCREED
Primer
Pour mixed Sikafloor®-80 EpoCem® Primer onto the prepared substrate and apply by brush, roller or squeegee then back roller in two directions at right angles to each other. Ensure a continuous, pore free coat covers the substrate.
Sikafloor®-81 EpoCem®
Pour mixed Sikafloor®-81 EpoCem® onto the prepared primed substrate and spread evenly using a suitable trowel or pin leveller to the required thickness.
Spike roller immediately in two directions at right angles to each other to remove trowel marks, aid air release, ensure an even thickness and obtain the required surface finish. A seamless finish can be achieved if a ‘wet’ edge is maintained during application.
CONCRETE PATCH REPAIR
Bonding primer
Apply the mixed SikaTop® Armatec®-110 EpoCem® onto the prepared substrate by brush.
Repair Mortar
Place the mixed Sikafloor®-81 EpoCem® repair mortar onto the bonding primer 'wet on wet' by gloved hand or trowel between the minimum and maximum layer thicknesses without the formation of voids.
Surface finishing
Finishing must be carried out to the required surface texture using trowel and / or sponge as soon as the repair mortar has started to harden.
CLEANING OF TOOLS
Clean all tools and application equipment with water immediately after use. Hardened / cured material can only be removed mechanically.