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• Features & Benefits
• Limitations
• Substrate Quality/Pre-Treatment
• Application

Features & Benefits

• High build
• Low wastage
• Contains no chloride admixtures
• Euro Class A1 fire rating
• Excellent adhesion to substrates
• Especially suitable for substrates with low strength and for lightweight concrete
• Low-shrinkage curing
• Incorporates sulphate-resistant cement
• High frost and deicing salt resistance
• Conforms to the requirements of EN 1504-3 R3 Classification

Limitations

• Refer to the recommendations provided in EN 1504- 10
• Avoid application in direct sun and/or strong wind
• Do not add water over recommended dosage
• Apply only to sound, prepared substrate
• Do not add additional water during the surface finishing as this will cause discolouration and/or cracking
• Protect freshly applied material from freezing

Substrate Quality/Pre-Treatment

Concrete:

• The concrete shall be thoroughly clean, free from dust, loose material, surface contamination and materials which reduce bond or prevent suction or wetting by repair materials
• Delaminated, weak, damaged and deteriorated concrete and where necessary sound concrete shall be removed by suitable mechanical or very high pressure waterblasting techniques
• Tying wire fragments, nails and other metal debris embedded in the concrete should be removed wherever possible
• The edges where concrete is removed should be cut at a minimum angle of 90° to avoid undercutting and a maximum angle of 135° to reduce the possibility of debonding with the top surface of the adjacent sound concrete and should be roughened sufficiently to provide a mechanical key between the original material and Sika Repair material
• Ensure sufficient concrete is removed from around the full circumference of the reinforcement to allow application of the reinforcement corrosion protection coating (if required) and compaction of the repair material

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 or high pressure waterblasting techniques to a minimum standard of SA 2 (ISO 8501-1)
• Where exposed reinforcement is contaminated with chloride or other material which may cause corrosion, the reinforcement shall be cleaned by low pressure waterblasting before application of reinforcement corrosion protective coating
• Reference shall be made to EN 1504-10 for specific requirements

Mixing:

• Sika MonoTop-615 can be mixed with a low speed (< 500 rpm) hand drill mixer, or for machine application, using a force action mixer with 2 to 3 bags (or more) at once, depending the type and size of mixer
• In small quantities, Sika MonoTop-615 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

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 Product Data Sheet (see 'data sheets' tab above) for compatible Sika Products and refer to the relevant Product Data Sheet(s) for instructions
• A small amount of Sika MonoTop-615 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-615 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 have 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 overtrowel 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 EN 1504-10 for specific requirements

Cleaning of Tools

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