
Sika MonoTop®-612
Sika® MonoTop-612 is a cement-based, one component low permeability repair microconcrete, containing silica fume and polymer, meeting the requirements of Class R4 of BS EN 1504-3.
- Pre bagged for quality
- Compatible with Sika® FerroGard® corrosion inhibitors
- Easy to mix and apply
- Low shrinkage
- Good mechanical properties
- Adjustable consistency
- Suitable for drinking water contact
Usage
- For repairing all types of structures
- Suitable for application in Marine enviroments
- Horizontal, vertical and overhead repairs
- Hand applied repairs
- Spray applied repairs
- For exterior and interior use
- In place of R1, R2 & R3 mortars
Advantages
- Pre bagged for quality
- Compatible with Sika® FerroGard® corrosion inhibitors
- Easy to mix and apply
- Low shrinkage
- Good mechanical properties
- Adjustable consistency
- Suitable for drinking water contact
Packaging
25kg Bag
Colour
Grey powder
Product Details
APPROVALS / STANDARDS
Resistivity: Mott MacDonald Report No. 37423/DA/001.Rev A
Conforms to the requirements of BS EN 1504-3 R4 Classification
Chemical Base
Portland cement, polymer redispersable powder, selected aggregates and additives
Shelf Life
6 months.
Storage Conditions
Store in original unopened, sealed and undamaged packaging in dry and cool conditions.
Density
Fresh mortar density: ~ 2.10 kg/l
Maximum Grain Size
Dmax: 3 mm
Soluble Chloride Ion Content
< 0.01%
System Structure
Sika MonoTop®-612 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®-610 | Carbonation |
SikaTop® Armatec® 110 EpoCem® | Chlorides |
Repair Mortars | |
All Sika® MonoTop® and SikaCem® Gunite series |
Smoothing Coat / Pore Filler | |
Sika MonoTop®-620 | Normal use |
Sikagard®-720 EpoCem® | Demanding requirements |
Corrosion Inhibitor | |
Sika® FerroGard®-903+ |
Anti-Carbonation Protective Coatings |
All Sikagard® Anti- Carbonation protective coatings |
Compressive Strength
1 day ~ 23 MPa (EN12190)
7 days ~ 50 MPa
28 days ~ 55 MPa
Modulus of Elasticity in Compression
~23 GPa (EN13412)
Tensile Strength
28 days ~ 7-9 MPa (EN12190)
Tensile Adhesion Strength
~ 3 MPa
Restrained Shrinkage / Expansion
~ 2.5 MPa (EN 12617-4)
Coefficient of Thermal Expansion
Coefficient 12.0 x 10-6 m/m °C (EN1770)
Reaction to Fire
Euro class A1 (EN 1504-3 cl 5.5)
Capillary Absorption
0.15 kg.m-2.h-0.5 (EN 13057)
Electrical Resistivity
(4 Point Wenner)
RH% | Resistivity (kohm.cm) |
100 | 46 |
81 | 90 |
65 | 136 |
44 | 176 |
Application
Mixing Ratio
Wet Spray Application: ~ 2.5 to 3.5 L of water for 25kg powder
Hand Application: ~ 2.5 to 3.2 L of water for 25kg powder
Layer Thickness
5.0 mm min. / 30 mm max.
Ambient Air Temperature
+5°C min. / +30°C max.
Substrate Temperature
+5°C min. / +30°C max.
Pot Life
~ 30-60 minutes (at +23°C)
Consumption
This depends on the substrate roughness and thickness of layer applied.
As a guide, ~ 2.11 kg/m2/mm.
MIXING
Sika MonoTop®-612 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 quantities, Sika MonoTop®-612 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 adding additional water during the mixing time if necessary to the maximum specified amount and adjust to the required consistency.
APPLICATION
Reinforcement Corrosion Protection Coating:
Where a reinforcement coating is required the application of a repair mortar shall be applied wet on dry onto 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.
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. A small amount of Sika MonoTop®-612 can also be mixed slightly wetter than normal and used as a scratch coat to fill any deep cavities or pits in the base of the substrate. Any bonding primer shall be applied on a pre-wet substrate and subsequent application of the scratch coat /repair mortar shall be applied wet on wet onto the bonding primer.
Repair Mortar Application:
Sika MonoTop®-612 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 do not allow to dry. Before application remove excess water e.g. with a clean sponge. 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 scraping the repair mortar over the base of the substrate surface to form a thin layer and fill any deep cavities. Ensure the whole surface to be repaired is covered by the scratch coat. For vertical applications,build up layers from bottom to top by pressing mortar well into the repair area. The surface can be finished according to the surface texture requirements using a float. Do not over-trowel as this may lead to surface cracking.
CURING TREATMENT
Protect the fresh mortar immediately from premature
drying for a minimum of 3 days using an appropriate curing method e.g. curing compound, moist geotextile membrane, polythene sheet etc.
Curing compounds shall not be used when they adversely affect subsequently applied products and systems.
Reference shall also be made to BS EN1504-10 for specific requirements.
CLEANING OF TOOLS
Clean all tools and application equipment with water immediately after use.
Hardened/cured material can only be mechanically removed.