Sikagard®-75 EpoCem® CA
Sikagard®-75 EpoCem® CA is a three-component, epoxy-modified, cementitious, solvent-free, moisture-insensitive, structural resurfacing and pore-filling mortar. It is specially formulated for vertical levelling and structural reprofiling of damp, “green” or saturated surface dry concrete.
- Economical structural repair and resurfacing compound.
- Self Priming, fast and easy to apply. Sprayable.
- Excellent adhesion to damp, green or, saturated surface dry concrete substrates.
- Can be overcoated with resin based coatings after ~ 24 hours at 20°C (68°F).
- Prevents osmotic blistering of resin based coatings over damp concrete substrates.
- Good adhesion after long term water immersion.
- Compatible with coefficient of thermal expansion of concrete.
- Suitable for interior and exterior use.
- Water based, solvent-free and virtually odourless.
- VOC content 0 g/L
Usage
Sikagard®-75 EpoCem® CA may only be used by experienced professionals. For resurfacing 0.5-3 mm (20 - 120 mil) thick:- On green or damp concrete, mortar and stone.
- As a thin-film sealer coat for vertical and horizontal surfaces.
- As a temporary moisture barrier prior to the application of resin based coatings [minimum 2 mm (80 mil) thickness]. Note: Sikagard®-75 EpoCem® CA must be sealed with a suitable Sika® epoxy coating to form a permanent vapour barrier. Contact Sika Canada for recommendations.
- For repairing spalled and pitted concrete, blowholes and honeycombing.
- Ideal for the repair of damp or saturated substrates such as sewage treatment plants, water treatment plants, tanks, tunnels, drains, etc.
- On grade, above and below grade on concrete.
Advantages
- Economical structural repair and resurfacing compound.
- Self Priming, fast and easy to apply. Sprayable.
- Excellent adhesion to damp, green or, saturated surface dry concrete substrates.
- Can be overcoated with resin based coatings after ~ 24 hours at 20°C (68°F).
- Prevents osmotic blistering of resin based coatings over damp concrete substrates.
- Good adhesion after long term water immersion.
- Compatible with coefficient of thermal expansion of concrete.
- Suitable for interior and exterior use.
- Water based, solvent-free and virtually odourless.
- VOC content 0 g/L
Packaging
23 kg (51 lb) / 11.3 L (3 US gal.) unit
Colour
Dark Grey, when mixed
Product Details
APPROVALS / CERTIFICATES
Meets the requirements of CFIA and USDA for use in food plants.
Shelf Life
1 year in original, unopened packaging.
Storage Conditions
Store dry at temperatures between 5 °C and 32 °C (41 °F and 89 °F). Protect from freezing and high temperatures. If frozen, discard.
Compressive Strength
| 10 °C (50 °F) | 20 °C (68 °F) | 30 °C (86 °F) | |
| 1 day | ~7 MPa (~1015 psi) | ~15 MPa (~2176 psi) | ~19 MPa (~2757 psi) |
| 7 days | ~35 MPa (~5078 psi) | ~44 MPa (~6384 psi) | ~47 MPa (~6819 psi) |
| 28 days | ~45 MPa (~6529 psi) | ~55 MPa (~7980 psi) | ~54 MPa (~7835 psi) |
Pull-Off Strength
| > 2.5 MPa (> 362 psi) (substrate failure) | (CAN/CSA A23.2-6B) |
Coefficient of Thermal Expansion
| ~9.9 X 10-6/°C (~5.5 x 10-6/°F) | (ASTM C531) |
Application
Mixing Ratio
(By Weight)
| Component A | 1.07 kg |
| Component B | 2.93 kg |
| Component C | 16-19 kg depending on consistency required |
Product Temperature
Condition product between 18 °C to 24 °C (65 °F to 75 °F) before use.
Ambient Air Temperature
Minimum 8 °C (46 °F) Maximum 25 °C (77 °F)
Application under extreme conditions (high temperature and low humidity) which can cause fast drying of the product must be avoided as the product does not allow the use of curing compounds. Prevent premature drying by protecting from strong wind and do not expose to direct sun light while fresh.
Apply Sikagard®-75 EpoCem® CA mortar on a falling temperature. If applied during rising temperatures “pin holing” and surface defects can occur.
Relative Air Humidity
Minimum 20% Maximum: 75 % (during application and cure)
Substrate Temperature
Minimum 8 °C (46 °F) Maximum 25 °C (77 °F)
Mixing and Application attempted at Material, Ambient and/or Substrate Temperature conditions less than 18 °C (65 °F) will result in a decrease in product workability and slower cure rates.
Pot Life
| 10 °C (50 °F) | 20 °C (68 °F) | 30 °C (86 °F) |
| ~45 min | ~35 min | ~25 min |
Do not use after this period.
Setting Time
| Initial | ~4 hours to ~5 hours |
| Final | ~7 hours to ~8 hours |
Finishing Time: ~45 minutes to ~2 hours after combining components depending on temperature, relative humidity and type of finish required.
| 10 °C (50 °F) | 20 °C (68 °F) | 30 °C (86 °F) | |
| Light mechanical loading | ~3 days | ~2 days | ~1 day |
| Final cure | ~14 days | ~7 days | ~5 days |
Curing times will vary according to ambient air and substrate temperatures and relative humidity.
Freshly applied material should be protected from dampness, condensation and water for at least 24 hours.
Mechanical, chemical and physical properties will be fully achieved at full cure.
Waiting Time / Overcoating
| Temperature | 10 °C (50 °F) | 20 °C (68 °F) | 30 °C (86 °F) |
| Top coat with epoxy coating | ~1 day | ~18 hours | ~12 hours |
NOTE: Temporary Moisture Barrier (TMB) effect of Sikagard®-75 EpoCem® CA is limited in time. Maximum overcoating time is 3 days at 20 °C (68 °F). If the 3-day overcoat time has passed, Sikagard®-75 EpoCem® CA must be mechanically prepared to achieve a dust free, open textured profile equivalent to ICRI/ CSP 3.
Permanent Moisture Barrier (PMB) effect is only achieved when Sikagard®-75 EpoCem® CA is sealed with a suitable epoxy coating such as Sikafloor®-1610 or Sika® MT Primer to form a permanent vapour barrier.
Maximum surface moisture content of Sikagard®-75 EpoCem® CA before application of standard Sikafloor®, Sikagard® or Sikalastic® resin-based coatings must be ≤ 4 % by mass (pbw – part by weight) as measured with a Tramex® CME/CMExpert type concrete moisture meter. Moisture tolerant primers; Sikafloor®-1610 and Sika® MT Primer can be applied over Sikagard®-75 EpoCem® CA if the surface moisture content is < 6 % by mass (pbw – part by weight) as measured with Tramex® CME/CMExpert type concrete moisture meter.
Yield
~5.5 m2/unit (~59 ft2/unit) when applied at a thickness of 2 mm (80 mil)
~3.7 m2/unit (~40 ft2/unit) when applied at a thickness of 3 mm (120 mil)
Maximum applied thickness of Sikagard®-75 EpoCem® CA is 3 mm (120 mils) per layer.
NOTE: Actual coverage rates and materials consumption will depend upon porosity and profile of substrate, and Component C mix ratio. Test sections are recommended to establish correct coverage.
MIXING
Do not hand mix Sikagard® materials. Mechanical mix only.
Pre-mix Component A and Component B by shaking vigorously in their respective containers for 30 seconds to ensure all solids are uniformly in suspension. Pour the binder mixture (A + B) into a clean, dry 20 L (5 US gal.) pail. Blend the combined Components (A+B) at low speed (300 - 450 rpm) thoroughly for 30 seconds using a drill fitted with an Exomixer® or Jiffy type paddle suited to the dimensions of the mixing container. Progressively add Component C while mixing, keeping the mixing paddle in the mortar to minimize entrapped air. Continue mixing thoroughly for three (3) minutes after complete addition of Component C. During the mixing operation, scrape down the sides and bottom of the pail with a flat or straight edge trowel at least once to ensure thorough mixing.
Note: The consistency of the mix may be adjusted to suit application requirements by slightly reducing the Component C powder. Contact Sika Canada for more information. Under no circumstances add additional water to the mix, which would disturb the surface finish and cause discolouration. A seamless finish can be achieved if a wet edge is maintained during application.
APPLICATION
At the time of application, surface should be saturated surface dry (SSD). Sikagard®-75 EpoCem® CA can be applied to the prepared substrate with a trowel and hawk. A lightly moistened rubber sponge float or mason’s brush may be used as required to provide a fine textured finish. A steel trowel may be used to provide a denser, smooth finish. To repair surface irregularities and holes greater than 3 mm (120 mils) in depth, consult Sika Canada.
Alternatively, Sikagard®-75 EpoCem® CA may be spray-applied. For spray application information, contact Sika Canada.
CLEAN UP
Clean all tools and equipment immediately after use with water. Onced hardened, the product can only be removed mechanically.