Sika MonoTop®-412 TH
Sika® MonoTop®-412 TH is a 1-component, fibre reinforced, low shrinkage structural repair mortar in accordance with EN 1504-3 class-R4.
- Superior workability
- Suitable for hand and machine application
- Can be applied up to 35 mm thick per layer
- Class R4 of EN 1504-3
- Structural repair
- Sulphate resistant
- Low shrinkage behaviour
Usage
- Suitable for restoration work. Repair of spalling and damaged concrete in buildings, bridges, infrastructure and superstructure works.
- Suitable for preserving or restoring passivity. Increasing cover with additional mortar and replacing contaminated or carbonated concrete.
- Treatment of chambers and seams prior to waterproofing.
Advantages
- Superior workability
- Suitable for hand and machine application
- Can be applied up to 35 mm thick per layer
- Class R4 of EN 1504-3
- Structural repair
- Sulphate resistant
- Low shrinkage behaviour
Packaging
20 kg/bag
Colour
Grey Powder
Product Details
Composition
Sulphate resistant cement, selected aggregates and additives
Shelf life
9 months from the date of production If stored properly in undamaged, original, sealed packaging.
Storage conditions
Store in dry and cool conditions, protected from direct sunlight.
Bulk density
~ 1.1 - 1.3 kg/l
Maximum grain size
Dmax: 2.0 mm
Compressive strength
1 day | 7 days | 28 days |
~ 20 MPa | ~ 30 MPa | ~ 45 MPa |
Tensile strength in flexure
1 day | 7 days | 28 days |
~ 5 MPa | ~ 6 MPa | ~ 8 MPa |
Tensile adhesion strength
~ 2 MPa @ 28 days
Application
Mixing ratio
~ 3.4 to 3.6 litres of water for 20 kg powder
Layer thickness
5 - 35 mm
Ambient air temperature
+10°C min.; +35°C max.
Substrate temperature
+10°C min.; +35°C max.
Initial set time
1 h @ +25°C
Final set time
2 h @ +25°C
Consumption
This depends on the substrate roughness and thickness of layer applied.
As a guide, ~ 2 kg of powder per mm thick per m2
MIXING
Sika® MonoTop®-412 TH 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 TH can also be manually mixed.
Pour the water in the correct proportion into a suitable mixing container. While stirring slowly, add the powder to the water. Mixed 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. When a bonding primer is not required pre-wet the surface.
The surface shall not be allowed to dry before application of the concrete repair mortar. The surface shall achieve a dark matt appearance without glistening and surface pores and pits shall not contain water.
When a bonding primer is necessary apply the same product – Sika® MonoTop®-412 TH – mixed wetter than normally required, applied well on the substrate with a stiff brush.
The, subsequent application of the repair mortar shall be done wet on wet.
Reinforcement coating : Where a reinforcement coating is required as a barrier (e.g. in case of insufficient concrete cover), apply to the whole exposed circumference two coats of SikaTop® Armatec -110 EpoCem® (Refer to the relevant Product Data Sheet).
Sika® MonoTop®-412 TH 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 pressed on (wet on wet technique). When applied manually, pressed the repair mortar with a trowel, pressing it well on 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 from early dehydration using the relevant curing method.
CLEANING OF EQUIPMENT
Clean all tools and application equipment with water immediately after use.
Hardened material can only be mechanically removed.