Sika MonoTop®-412 NFG
Sika MonoTop®-412 NFG is a 1-component, polymer modified, fibre reinforced, low shrinkage repair mortar with corrosion inhibitor meeting the requirement of class R4 of EN 1504-3.
- Polymer modified for increased durability
- Superior workability and finishing
- Suitable for hand and machine application
- Can be applied up to 50 mm thick per application layer
- Class R4 of EN 1504-3, Structural repair product
- Sulphate resistant
- Very low shrinkage behaviour
- Does not require a bonding primer even when manually applied
- Contains corrosion inhibitor
- Low permeability
- Compatible with Sika® FerroGard® Sacrificial Anode System
Usage
- Suitable for restoration work (Principle 3, method 3.1 & 3.3 of EN 1504-9). Repair of spalling and damaged concrete in buildings, bridges, infrastructure and superstructure works.
- Suitable for structural strengthening (principle 4, method 4.4 of EN 1504-9). Increasing the bearing capacity of the concrete structure by adding mortar.
- Suitable for preserving or restoring passivity (principle 7, method 7.1 and 7.2 of EN 1504-9). Increasing cover with additional mortar and replacing contaminated or carbonated concrete.
Advantages
- Polymer modified for increased durability
- Superior workability and finishing
- Suitable for hand and machine application
- Can be applied up to 50 mm thick per application layer
- Class R4 of EN 1504-3, Structural repair product
- Sulphate resistant
- Very low shrinkage behaviour
- Does not require a bonding primer even when manually applied
- Contains corrosion inhibitor
- Low permeability
- Compatible with Sika® FerroGard® Sacrificial Anode System
Packaging
20 kg bags
Colour
Grey powder
Product Details
APPROVALS / CERTIFICATES
- Potable Water approved to AS4020:2018 - Testing of products for use in contact with drinking water.
- RTA Rapid Mortar Bar Test RTA T363 - Alkali Reactive Particles <0.15% (Non-Reactive).
- Qld Roads (TMR) Section 5. Registered and Conforming Products. Part 5.34 Repair Mortars.
Composition
Ordinary Portland Cement, corrosion inhibitor, selected aggregates and polymer modified
Shelf life
12 months
Storage conditions
Store properly in undamaged original sealed packaging, in dry cool conditions.
Maximum grain size
Dmax: 2.0 mm
Density
Fresh mortar density ~2.10 kg/l
Soluble chloride ion content
≤ 0.05% | (EN 1015-17) |
System structure
Sika MonoTop®-412 NFG is part of the range of Sika mortars complying with the relevant part of European Standard EN 1504 and comprising of:
| Bonding Primer / Reinforcement Corrosion Protection | |
| Sika MonoTop®-910 N | Normal Use |
| SikaTop® Armatec® 110 EpoCem® | Demanding applications |
| Repair Mortar | |
| Sika MonoTop®-412 NFG | Class R4 concrete repair hand and machine applied |
| Levelling Mortar | |
| Sika MonoTop®-723 N | Normal use |
| Sikagard®-720 EpoCem® | Demanding applications |
Compressive strength
| 1 day | ~ 15 MPa |
| 7 days | ~ 40 MPa |
| 28 days | ~ 50 MPa |
Material and curing conditions at 23°C / 50% r.h.
Above results based on 50mm x 50mm cubes @ 2.8 litres water per 20kg bag
Modulus of elasticity in compression
| ~ 35 GPa @ 56 Days | (AS 1012.17) |
Tensile strength in flexure
| 1 day | ~ 3.0 MPa |
| 7 days | ~ 7.0 MPa |
| 28 days | ~ 8.0 MPa |
Splitting tensile strength
| ~ 6.0 MPa at 28 days | (AS 1012.10) |
Tensile adhesion strength
| > 2.0 MPa | (EN 1542) |
Shrinkage
| ~600 µm/m at 23°C / 50% relative humidity at 28 days | (AS 2350.13:2006) |
Restrained shrinkage / expansion
| ≥ 2.0 MPa | (EN 12617-4) |
Electrical resistivity
| 7 days | ~ 12,000 Ω.cm |
| 28 days | ~ 33,000 Ω.cm |
| 56 days | ~ 47,000 Ω.cm |
| 90 days | ~ 51,000 Ω.cm |
Capillary absorption
| 2.0 x 10-4 mm/√s | (ASTM C 1585) |
Chloride ion diffusion resistance
| 7.55 E-12 (m2/s) | (NT443) |
Application
Mixing ratio
2.7 to 3.0 litres of water for 20 kg powder
Layer thickness
min. 6 mm / max. 50 mm
Ambient air temperature
+5 °C minimum; +30 °C maximum
Substrate temperature
+5 °C minimum; +30 °C maximum
Pot Life
~40 minutes at +20°C
Initial set time
~ 1 hour
Final set time
~ 4 hours
Consumption
This depends on the substrate roughness and thickness of layer applied. As a guide, ~ 19 kg of powder per cm thick per m2
Yield
20 kg of powder yields approximately 11.0 litres of mortar
MIXING
Sika MonoTop®-412 NFG can be mixed with a low speed (< 500 rpm) hand drill mixer or for machine application, using a force action mixer 2 to 3 bags or more at once depending the type and size of mixer. In small quantity, Sika MonoTop®-412 NFG can also be manually mixed.
Pour the recommended water in a suitable mixing container. While stirring slowly, add the powder to the water and mix thoroughly at least for 3 minutes to the required consistency.
APPLICATION
Bonding Primer:
On a well prepared and roughened substrate a bonding primer is generally not required for this product. When a bonding primer is required, refer to the System Information above for compatible Sika products and refer to the relevant Product Data Sheet for instructions. All small amount of Sika MonoTop®-412 NFG can also be mixed slightly wetter than normal and used as a scratch coat to promote adhesion of the repair mortar to the substrate. Any bonding primer shall be applied on a pre-wet substrate in saturated surface dry (SSD) condition and subsequent application of the repair mortar shall be applied wet on wet with the bonding primer.
Reinforcement Corrosion Protection:
Where a reinforcement coating is required the application of a repair mortar shall be applied wet on dry with the reinforcement corrosion protection. Refer to the System Information above for compatible Sika products and refer to the relevant Product Data Sheet for more detailed information about the reinforcement corrosion product.
Sika MonoTop®-412 NFG can be applied either manually using traditional techniques or mechanically using wet spray equipment. Thoroughly pre-wet the prepared substrate a recommended 2 hours before application. Keep the surface wet and maintain in SSD condition. The surface shall appear a dark matt appearance without glistening and surface pores and pits shall not contain water.
When manually applying first make a scratch coat by firmly scrapping the repair mortar over the substrate surface to form a thin layer and fill any pores or pits in the surface. Ensure the whole surface to be repaired is covered by the scratch coat. Build up layers from bottom to top by pressing mortar well into the repair area. The surface can be finished according to the requirements using a float while wet or with a relevant rough-cast tool as soon as the mortar has started to stiffen.
CURING TREATMENT
Protect the fresh mortar immediately from premature drying using an appropriate curing method e.g. curing compound, moist geotextile membrane, polythene sheet etc.
CLEANING OF EQUIPMENT
Clean all tools and application equipment with water immediately after use. Hardened material can only be mechanically removed.