Description

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.