Sikafloor® CureHard-24
Sodium silicate liquid surface hardener and dust proofer for concrete
Sikafloor® CureHard-24 is a high volume solids, one-part, clear, sodium silicate-based liquid used to harden and densify fresh or hardened concrete.
- Treated concrete has reduced dust emissions when compared to the same concrete untreated
- Treated concrete has increased abrasion resistence when compared to the same concrete untreated
- Seals concrete surfaces
- Very good yellowing resistance
- One-part ready to use
- Easy to apply
- High gloss with regular cleaning
- Odourless
Usage
Sikafloor® CureHard-24 is used for:- Hardening and densifying concrete surfaces where a hard surface with light to moderate abrasion resistance is required
- Dust-proofing prefabricated concrete elements
- Horizontal old or new concrete surfaces
- Prefabricated concrete elements
- Industrial buildings
- Commercial and public buildings
Advantages
- Treated concrete has reduced dust emissions when compared to the same concrete untreated
- Treated concrete has increased abrasion resistence when compared to the same concrete untreated
- Seals concrete surfaces
- Very good yellowing resistance
- One-part ready to use
- Easy to apply
- High gloss with regular cleaning
- Odourless
Packaging
One Part Container | 25 L container and 200 L drum |
Refer to the current price list for available packaging variations.
Colour
Colour | Clear |
Product Details
ENVIRONMENTAL INFORMATION
Contributes towards satisfying Materials and Resources (MR) Credit: Building Product Disclosure and Optimization — Material Ingredients under LEED® v4 — 1 point
Environmental Product Declaration (EPD) in accordance with EN 15804. EPD independently verified by Institut für Bauen und Umwelt e.V. (IBU)
APPROVALS / STANDARDS
CE marking and declaration of performance based on EN 1504-2:2004 Products and systems for the protection and repair of concrete structures — Surface protection systems for concrete — Impregnation
Chemical Base
Sodium silicate water dilution
Shelf Life
24 months from date of production
Storage Conditions
The Product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +40 °C. Always refer to the packaging.
Refer to the current Safety Data Sheet for information on safe handling and storage.
Density
1.2 kg/L (at +20 °C) | (EN ISO 2811-1) |
Solid content by weight
24 %
Abrasion Resistance
Abrasion tests conducted on samples of C(0.70) concrete according to EN 1766:2000.
Sample treated with Sikafloor® CureHard-24 | 1350 mg (H22 / 1000 g / 1000 cycles) |
Untreated sample | 270 mg (H22 / 1000 g / 1000 cycles) |
81.5 % increase in abrasion resistance compared to untreated sample.
Resistance to Impact
60 Nm (class III: ≥ 20 Nm) Applied to a sample MC(0.40) concrete according to EN 1766:2000 | (EN ISO 6272-1) |
Tensile Adhesion Strength
4.8 N/mm² | (EN 1542) |
Applied to a sample MC(0.70) concrete according to EN 1766:2000
Penetration Depth
5.5 mm Applied to a sample MC(0.70) concrete according to EN 1766:2000 | (EN 1504-2) |
Water Absorption
w = 0.03 kg·m-2·h-0.5 (on a substrate w > 1 kg·m-2.h-0.5) | (EN 1062-3) |
Application
Product Temperature
Maximum | +35 °C |
Maximum | +5 °C |
Ambient Air Temperature
Maximum | +35 °C |
Minimum | +5 °C |
Relative Air Humidity
Maximum | 100 % |
Substrate Temperature
Maximum | +35 °C |
Minimum | +5 °C |
Waiting Time / Overcoating
+5 °C and 50 % r.h. | 3.5 hours |
+10 °C and 50 % r.h. | 3 hours |
+20 °C and 50 % r.h. | 2 hours |
+30 °C and 50 % r.h. | 1.5 hours |
Note: Times are approximate and will be affected by changing ambient conditions, particularly temperature and relative humidity.
Applied Product Ready for Use
Temperature | Full cure |
+10 °C | 6 hours |
+20 °C | 5 hours |
+30 °C | 4 hours |
Note: Times are approximate and will be affected by changing ambient conditions, particularly temperature and relative humidity.
Drying Time
Touch-dry, at +20 °C | 2 hours |
Maximum sealing and hardening, at +20 °C | 7 days |
Strength development and the curing period are dependant on the following factors:
Concrete composition
Fresh concrete temperature
Ambient conditions
Concrete dimensions
Consumption
0.15–0.25 L/m2 per coat (4–7 m²/L per coat) on power trowelled concrete
Note: Consumption data is theoretical and does not allow for any additional material due to surface porosity, surface profile, variations in level, wastage or any other variations. Apply the Product to a test area to calculate the exact consumption for the specific substrate conditions and proposed application equipment.
SUBSTRATE QUALITY
Unsuitable substrate conditions for application
Note: The Product will not compensate for poor substrates with low cement content.
Note: It is not intended for substrates which are lightweight, extremely porous, or have worn surfaces with exposed aggregates.
Note: It will not hide serious staining or excessive wear.
FRESH CONCRETE ≥ 7 DAYS
The fresh concrete curing period must be long enough for the surface to achieve structural strength and impermeability sufficient to provide the required concrete durability and corrosion protection of the steel reinforcement.
HARDENED OR OLD CONCRETE
Cementitious substrates must be structurally sound, clean, dry and free of contaminants such as dirt, oil, grease, coatings, laitance, surface treatments and loose friable material.
If in doubt apply a test area first.
SUBSTRATE PREPARATION
IMPORTANT
Poor penetration and adhesion due to existing surface treatments
Concrete surfaces with existing applications of curing agents, membrane-forming sealers, or asphalt will affect the Product's penetration depth and performance.
- Completely remove any existing surface treatments from the concrete prior to application.
FRESH CONCRETE
- Finish the concrete using power floating, manual floating or tamping techniques.
- Cure the concrete for at least 7 days with waterspray, blankets or plastic sheets.
HARDENED OR OLD CONCRETE
- Clean the concrete surface with water using high-pressure cleaners or ride-on cleaning machines.
- Allow the cleaned substrate to completely dry.
- Completely remove all dust, dirt, loose and friable material from all surfaces with a brush or vacuum cleaner.
APPLICATION
IMPORTANT
Damage to non-concrete substrates due to etching
If left in contact with glass, aluminium, or highly polished finishes, the Product can etch the surface.
- Immediately wash off overspray with water from surfaces that are not to be treated.
Hot weather working above +25 °C
Note: In hot weather conditions, gelling may occur before material has penetrated sufficiently.
- Store the Product in a cool place prior to use.
- Apply additional material to keep the surface wet during the scrubbing application process.
Cold weather working below +10 °C
Note: At low temperatures the product may thicken and be difficult to spray.
- Observe the recommended storage and application temperatures.
Exposing the treated surface to moisture after application
Note: Exposure to moisture before the Product has fully reacted with the concrete surface can cause efflorescence. Efflorescence can only be removed from the surface mechanically.
- Protect the treated concrete surface from moisture for at least 3 days after application.
Preconditions
The spraying equipment has been thoroughly cleaned to remove any residue of previous membranes.
- IMPORTANT Do not use sprayers that have previously been used to spray silicones or release agents. Apply the Product in a continuous film using a high-volume, low-pressure spray unit. Note Touch up any dry spots on the surface where necessary.
- Scrub material into the surface with a soft bristle broom or floor-scrubbing machine for a minimum of 30 minutes, until the material begins to gel and becomes slippery. Note Gelification time may be increased at low temperatures (below +10 °C), high humidity (from 80 % to 100 %) or wind-free conditions.
- Wet the material slightly with a water spray and rework it into the surface for another 10 to 20 minutes.
- IMPORTANT Dried residue or excess material will leave white stains that can only be removed mechanically. After about 20 minutes, when the material has returned to a gel, rinse the floor and remove any excess material using a squeegee, wet vacuum or mop.
- On porous, rough-textured or brush-finished surfaces, a second coat is required. Note Apply the second coat after the first one is dry and tack-free.
- For large surfaces, ride-on cleaning machines can be used to place, brush in and remove the excess material from the surface.
- After cure abrade the surface mechanically prior the application of a subsequent coating system. Note Use light to heavy shot blasting depending on the depth of the Product penetration.
CLEANING OF TOOLS
Clean all tools and application equipment with water immediately after use. Hardened material can only be removed mechanically.