Sika MonoTop®-4400 MIC
Microbially induced corrosion resistant sewer repair mortar
Sika MonoTop®-4400 MIC is a 1-part, ready to use, high performance, calcium aluminate mortar specifically designed for the repair and protection of new or existing sewer infrastructure from biogenic sulphuric acid corrosion.
- Resistant to biogenic sulphuric acid corrosion
- Resistant to pure water, salt water, sulphated soils and several diluted acids
- Does not contain chlorides or other corrosion promoting additives
- Suitable for machine application (wet and dry spray technique)
- High bond strength
- High early compressive strength, class R4 of EN 1504-3
- Fast return to service (within 1 hour if Sikagard®-230 MIC surface hardener is used)
Usage
Particularly suitable for the protection and refurbishment of:- Sewer infrastructures
- Manholes
- Lift stations, pumping stations
- Main trunk sewers, collectors
- Sewer pipes
- Waste water treatment plants
Advantages
- Resistant to biogenic sulphuric acid corrosion
- Resistant to pure water, salt water, sulphated soils and several diluted acids
- Does not contain chlorides or other corrosion promoting additives
- Suitable for machine application (wet and dry spray technique)
- High bond strength
- High early compressive strength, class R4 of EN 1504-3
- Fast return to service (within 1 hour if Sikagard®-230 MIC surface hardener is used)
Packaging
25 kg bags
Colour
Grey powder
Product Details
APPROVALS / STANDARDS
- CE Marking and Declaration of Performance to EN 1504-2 - Surface protection product for concrete - Coating - Sika MonoTop®-4400 MIC
- CE Marking and Declaration of Performance to EN 1504-3 - Concrete repair product for structural repair - Sika MonoTop®-4400 MIC
- Resistance to biogenic sulfuric acid corrosion, Fraunhofer Institute for Environental, Safety and Energy Technology, report 20191108-01
- Biogenic acid concrete test, Lmdc Toulouse, report ET/19.064c
Chemical Base
Calcium aluminate cement and calcium aluminate aggregates
Shelf Life
15 months from date of production
Storage Conditions
Product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +35 °C. Always refer to packaging.
Maximum Grain Size
Dmax: ~3,0 mm
Compressive Strength
24 hours | 28 days |
> 40 MPa | > 50 MPa |
Tensile Strength in Flexure
24 hours | 28 days |
> 6 MPa | > 9 MPa |
Application
Mixing Ratio
3.5 – 4,0 litres of water for 25 kg powder
Fresh mortar density
~2,2 kg/l
Layer Thickness
Standard manholes: Minimum 15 mm
Large structures such as wet wells or pumping stations: Minimum 25 mm.
Waiting Time / Overcoating
Minimum 12 hours at +20 °C
Consumption
~22 kg / 10mm thickness / m2
Yield
25 kg of powder yields approximately 13,0 litre of fresh material
MIXING
Sika MonoTop®-4400 MIC can be mixed with a low speed (< 500 rpm) hand drill mixer or using a force action mixer.
Pour the minimum recommended water in a suitable mixing container. While stirring slowly, add powder to the water and mix thoroughly for at least 5 minutes adding additional water if necessary to the maximum specified amount and adjust to the required consistency. The consistency must be checked after every mix.
APPLICATION
Sika MonoTop®-4400 MIC can be applied mechanically using a low pressure wet-spray equipment, high pressure dry-spray equipment, progressive cavity type pump, spinning head or centrifugation method. Prepare the hose of the machine with a cement aluminate slurry or with a suitable chemical pump starter. Do not use Portland cement slurry.
Thoroughly pre-wet the prepared substrate a recommended 12 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 must appear a dark matt appearance without glistening and surface pores and cavities must not contain water.
The repair mortar must be applied onto the pre-wetted substrate between the minimum and maximum layer thicknesses without the formation of voids. Where layers are to be built up, to prevent sagging or slumping, each layer must be allowed to stiffen before applying subsequent layers “wet on wet”.
Finishing must be carried out to the required surface texture as soon as the mortar has started to stiffen. Do not overwork the finishing layer.
CURING TREATMENT
If the application takes place in a live sewer environment, replacing the access covers as soon as the spaying and finishing is complete should ensure adequate moisture for good hydration and curing.
For environments with low humidity or with exposure to direct sunlight and/or strong air movement. To minimize rapid moisture evaporation and surface cracking, water curing must be applied as soon as practical after installation in addition to replacing the access covers.
Once the surface finishing is complete. To accelerate the hardening process and at the same time to provide adequate curing,apply Sikagard®-230 MIC surface hardener with low pressure spraying equipment
Conventional curing compounds are not recommended.
CLEANING OF TOOLS
Clean all tools and application equipment with water immediately after use. Hardened material can only be mechanically removed.