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.

Sika MonoTop®-4400 MIC may only be used by experienced professionals.

Particularly suitable for the protection and refurbishment of sewer infrastructure, manholes, lift stations, pumping stations and waste water treatment plants.

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• Features & Benefits
• Product Information
• Substrate Preparation
• Application
• Limitations
• Health And Safety

Features & Benefits

• One-component, ready to use.
• Calcium aluminate mortar specifically designed for the repair and protection of new or existing sewer infrastructure from 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.

Product Information

Shelf Life: 15 months.

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.

Chemical Base: Calcium aluminate cement and calcium aluminate aggregates.

Consumption: ~22 kg / 10 mm thickness / m².

Yield: 20 kg of powder yields approximately 10.5 litres of fresh material.

Substrate Preparation

Concrete

• The concrete must have a minimum compressive strength of 25 MPa and minimum tensile adhesion strength of 1.5 MPa.
• The concrete must be thoroughly clean, free from dust, loose material, surface contamination and material which reduce bond or prevent suction or wetting by repair materials.
• De-laminated, weak, damaged and deteriorated concrete and where necessary sound concrete must be removed by suitable means.
• Smooth concrete shall be mechanically prepared (e.g. wet sand blasting) to expose the aggregates and provide a suitable roughened surface.

Steel reinforcement

• Rust, scale, mortar, concrete, dust and other loose and deleterious material which reduces bond or contributes to corrosion shall be removed.
• Surfaces shall be prepared using abrasive blast cleaning techniques or high pressure water-blasting to SA 2 (ISO 8501-1) Reference shall be made to EN1504-10 for specific requirements.
• Rust, scale, mortar, concrete, dust and other loose and deleterious material which reduces bond or contributes to corrosion must be removed.
• Surfaces must be prepared using abrasive blast cleaning techniques or high pressure water-blasting to Sa 2 (ISO 8501-1).

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 up 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,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.
• To minimise rapid moisture evaporation and surface cracking, water curing must be applied as soon as practical after installation in addition to replacing the access covers.

Cleaning Of Tools

• Clean all tools and application equipment with water immediately after use.
• Hardened/cured material can only be mechanically removed.

Limitations

• Sika MonoTop®-4400 MIC is only mixed with clean water. Do not add Portland cement or additional aggregates.
• Spray equipment must be clean and free of Portland cement contamination to avoid premature setting and reduced corrosion resistance behavior.
• Avoid application in direct sun and/or strong wind.
• Do not add water over the recommended dosage.
• Apply only to sound, prepared substrate.
• Do not add additional water during the surface finishing as this will cause discolouration and cracking.

Health And Safety

Further information about hazardous influences and protection are detailed in individual health and safety data sheets.

Please contact Rawlins Paints' Technical Support Team on 0113 2455450 (option 2) or send a message to [email protected] for more information.

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