Sika MonoTop®-412 MY
Structural repair mortar for hand placed / wet spray
Sika MonoTop®-412 MY is a single component, fibre reinforced, low shrinkage structural repair mortar. Fast repairs to overhead, horizontal or vertical concrete or mortar surfaces above and below ground level.
- Superior workability
- Suitable for hand and machine application
- Can be applied up to 50 mm thick per application layer
- Structural repair
- Very low shrinkage behaviour
- Does not require a bonding primer even when manually applied (for static load only)
- Low permeability
Usage
- Fast repairs to overhead, horizontal or vertical concrete or mortar surfaces above and below ground level.
- Suitable for restoration work. Repair of spalling and damaged concrete in buildings, bridges, infrastructure and superstructure works
- Suitable for structural strengthening. Increasing the bearing capacity of the concrete structure by adding mortar
- Suitable for preserving or restoring passivity. Increase cover with additional mortar and replace contaminated or carbonated concrete
Advantages
- Superior workability
- Suitable for hand and machine application
- Can be applied up to 50 mm thick per application layer
- Structural repair
- Very low shrinkage behaviour
- Does not require a bonding primer even when manually applied (for static load only)
- Low permeability
Packaging
25 kg bag
Colour
Grey powder
Product Details
APPROVALS / CERTIFICATES
Sika MonoTop®-412 MY complies with R4 class specifications according to EN 1504-3 that are relevant for tropical countries. Test report No. MIS 080/13/R 0753
Shelf life
6 months from date of production
Storage conditions
Store properly in undamaged original sealed packaging, in dry conditions. Protect from moisture and rain.
Density
Fresh mortar density: ~2.10 kg/l
Maximum Grain Size
2.2 mm
Soluble Chloride Ion Content
| Test Result | Class R4 requirement |
| 0.011 % | ≤ 0.05 % |
System Structure
Sika MonoTop®-412 MY complies with the R4 class specifications according to EN 1504-3 that are relevant for tropical countries (tests carried out at 25–30 °C).
Sika MonoTop®-412 MY is part of the range of Sika mortars comprising of:
Bonding primer / Corrosion Protection
| Sika MonoTop®-610 MY | Normal use |
| SikaTop® Armatec® 110 EpoCem® | Demanding requirements |
Repair mortar
| Sika MonoTop®-412 MY | Structural hand & machine applied repair mortar |
Fairing coat
| Sika MonoTop®-620 MY | Pore sealer and smoothing mortar |
Compressive Strength
| 1 day | ≥ 20 N/mm² |
| 7 days | ≥ 40 N/mm² |
At 28 days:
| Test Result | Class R4 requirement |
| 52 N/mm² | ≥ 45 N/mm² |
Modulus of Elasticity in Compression
| Test Result | Class R4 requirement |
| 24.9 GPa | ≥ 20 GPa |
Tensile Strength in Flexure
| 1 day | ~4 N/mm² |
| 7 days | ~7 N/mm² |
| 28 days | ~9 N/mm² |
Tensile Adhesion Strength
| Test Result | Class R4 requirement |
| 2.8 N/mm² | ≥ 2.0 N/mm² |
Restrained Shrinkage / Expansion
| Test Results | Class R4 requirement | |
| Control Value | 2.65 N/mm² | ≥ 2 N/mm² |
| Restrained Drying Shrinkage | 2.38 N/mm² | ≥ 2 N/mm² |
| Restrained Expansion | 2.31 N/mm² | ≥ 2 N/mm² |
Baenziger Block
No cracks with Baenziger Block Test
Thermal Compatibility
| Test Result | Class R4 requirement | |
| Control Value | 2.74 N/mm² | ≥ 2 N/mm² |
| Thunder Shower for 10 cycles | 2.19 N/mm² | ≥ 2 N/mm² |
| Thunder Shower for 30 cycles | 2.07 N/mm² | ≥ 2 N/mm² |
Capillary Absorption
| Test Result | Class R4 requirement |
| 0.271 kg/m².h0.5 | ≤ 0.5 kg/m².h0.5 |
Carbonation Resistance
| dkmean for test specimen | dkmean for control specimen | Class R4 requirement |
| 4.35 | 4.50 | dkmean for test specimen < dkmean for control specimen |
Application
Mixing Ratio
3.5–4.0 L of water for 25 kg powder
Layer Thickness
6 mm min. / 50 mm max.
Ambient Air Temperature
+6 °C min. / +40 °C max.
Substrate Temperature
+6 °C min. / +40 °C max.
Pot Life
~30 minutes at +23 °C
Consumption
Depends on the substrate roughness and thickness of layer applied. As a guide, ~19 kg of powder per cm thick per m²
Yield
1 bag yields approximately 13.7 L of mortar
MIXING
Sika MonoTop®-412 MY can be mixed with a low speed (< 500 rpm) hand-drill mixer fixed to a mixing paddle or 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 MY can also be mixed manually using a trowel or scrapper in a clean container.
Pour the water in the correct proportion into a clean mixing container. While stirring slowly, add the powder to the water. Mixed thoroughly for a minimum of 3 minutes, until the required consistency.
APPLICATION
Sika MonoTop®-412 MY can be applied either manually using traditional techniques or mechanically using wet spray equipment.
When a bonding primer is required, ensure it is still tacky when the repair material is applied (wet on wet technique). When applied manually, pressed the repair mortar with a trowel, working it well into the substrate.
Finishing for both hand and machine application can be done with the relevant roughcast as soon as the mortar has started to stiffen.
CURING TREATMENT
Protect the fresh mortar immediately from early hydration using a curing compound or wet-hessian.
CLEANING OF EQUIPMENT
Clean all tools and application equipment with water immediately after use. Hardened material can only be mechanically removed.