Sika Mono Top 615 SD

Sika MonoTop®-615 SD - High build polymer modified cementitious patch repair mortar

Product Description

Sika MonoTop®-615 SD is a one-part, thixotropic, high build, polymer modified, cementitious mortar containing silica fume.

Sika MonoTop®-615 SD cures to produce a medium strength mortar with enhanced polymeric properties.

Sika MonoTop®-615 SD exhibits high bond strength, greatly reduced water and carbon dioxide permeability and improved resistance to oils and chemicals.

Uses Fast repairs to overhead, horizontal or vertical concrete or mortar surfaces above and below ground level

• Filling / repair mortar for voids, honeycombed areas, etc.
• Repair of spalled concrete caused by reinforcement corrosion
• Repairs with improved resistance to oils, sewage, chemicals, etc.

Characteristics / Advantages

• Fast and easy to apply in layers up to 60 mm thick (vertical application)
• 1-part system requiring only the addition of clean water
• Compatible with the thermal expansion properties of concrete
• Chloride free
• Non-corrosive to reinforcing steel
• Non-toxic, suitable for potable water
• Contain fibres to prevent micro cracks
• Non-shrink
• Excellent freeze / thaw resistance
• Good resistance to long term water immersion

Product Data

Form

Appearance / Colour Concrete grey powder

Packaging 25 kg bag

Storage

Storage Conditions / Shelf-Life

6 months from the date of production if stored properly in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5°C and +30°C. Keep away from direct sunlight.

Technical Data

Density ~ 1.5 kg/litre (freshly mixed mortar)

Layer Thickness 5 mm to 60 mm (vertical application)

Mechanical / Physical Properties

Compressive Strength (at 25°C)

• 1 day > 6 N/mm2
• 28 days > 25 N/mm2

Flexural strength (at 25°C)

• 1 day > 3 N/mm2
• 28 days > 6 N/mm2

Bond Strength On Concrete > 1.5 N/mm2 (with bonding bridge)

Modulus of Elasticity < 20,000 N/mm2

System Information

System Structure Sika MonoTop® System comprises:

• Sika MonoTop®-610 MY bonding bridge and reinforcement protection
• Sika MonoTop®-615 SD or Sika MonoTop®-R or Sika MonoTop®-R40 repair mortar
• Sika MonoTop®-620 MY pore sealer / fairing coat

Application Details

Material Consumption ~ 52 bags (25 kg) per m3 (1 bag yields ~ 19 litres of mortar)

Substrate Quality

Concrete

Surfaces must be sound, clean, free from oils, grease, standing water and any loose or friable adhering particles and any other surface contaminants. The concrete “pull off” (tensile) strength must be > 1.0 N/mm2.

Steel Reinforcement

Surfaces must be clean from rust products, oil, grease and other loosely adhering particles to provide a rust free surface.

Substrate Preparation

Concrete

Proper surface preparation is essential to achieve the high adhesive qualities of Sika MonoTop®-615 SD. For large areas, grit or grit-water blasting, scarifying or scrabbling is recommended. For small areas and for 'spot' repairs, needle gunning or scrabbling is effective.

The prepared substrate should be thoroughly soaked with clean water until uniformly saturated but with no surface water. This condition is referred to as saturated surface dry (SSD) and care should be taken to remove any cement slurry or dust produced during surface preparation. The use of a "fan" shaped water jet is ideal.

Steel reinforcement should have all traces of rust removed and be primed with 2 coats of Sika MonoTop®-610 MY.

Steel Reinforcement

Surfaces must be prepared using approved abrasive blast cleaning techniques.

Bonding Bridge

Concrete

Prior to application of Sika MonoTop®-615 SD, Sika MonoTop®-610 MY should be applied as a bonding bridge. Always work “wet-on-wet” onto the bonding bridge (refer to Sika MonoTop®-610 MY Product Data Sheet).

Reinforcement

2 coats of Sika MonoTop®-610 MY should be brush applied to the prepared steel (refer to Product Data Sheet).

Application Conditions / Limitations

Application Temperature +5°C min. / +40°C max.

Application Instructions

Mixing

3.7 – 3.9 litres of clean water per 25 kg bag to suit desired consistency. Sika MonoTop®-615 SD should be mechanically mixed in a clean drum using a drill and paddle. A normal tilting drum concrete mixer is not suitable. Place clean water into a clean drum and add Sika MonoTop®-615 SD slowly while mixing.

A minimum mixing time of 3 minutes is recommended to thoroughly blend the components with a maximum speed of 500 rpm to minimise air entrainment.

Application Method / Tools

Work wet-on-wet the mixed mortar well into the substrate using a placing rather than a rendering technique to fill all pores and voids. Compact well. Force material against the edge of the repair, working towards the centre.

For repairs in excess of 60 mm deep, apply in layers and form keys for subsequent layers. If previous layers are over 48 hours old, needle gun the surface and dampen before applying the next layer. Steel trowel the final coat if required.

The Sika MonoTop®-615 SD and surrounding areas can be further treated with SikaTop® Seal-107 or Sika MonoTop®-620 MY to provide a water and carbonation resistant finish.

Cleaning of Tools

Clean all tools and application equipment with water immediately after use.

Hardened and/or cured material can only be mechanically removed.

Pot Life (at +20°C) 30 minutes

Notes on Application / Limitations

• Repairs with Sika MonoTop® System cannot bridge live cracks or moving joints, etc.
• Repairs in excess of 60 mm must be layered
• Sika MonoTop® mortars that are wetted during the initial cure period may produce a white "bloom" on the surface which does not affect the long term properties of the mortar

Curing Details

Curing Treatment To achieve the full potential of any cement based product, curing is essential. This can be carried out with the application of a curing compound such as Antisol®-E or with other curing practices such as covering with polythene sheets or damp hessian for 3 days