Unicem Lite s a lightweight, high build, shrinkage compensated, polymer modified mortar for the repair, rendering and profiling of concrete, brick or stone substrates.  

Unicem Lite is a single component cementitious mortar which incorporates the most advanced cement chemistry, microsilica, fibre and styrene acrylic copolymer technology. This results in a rapid hardening, low density mortar with enhanced polymer properties. The thixotropic nature of the product enables easy high build trowel application for the repair of voids and the rendering and re-profiling of both vertical and horizontal surfaces. The product is supplied as a single component system requiring only the addition of clean water.

Advantages:

• Contains the latest cement chemistry, microsilica, fibre and styrene acrylic copolymer technology
• Gives an easily trowellable mortar
• High bond strength
• Improved tensile and impact strength
• Excellent low sag properties
• Requires no substrate or inter-layer priming
• Part bags can be mixed
• Easily overcoated with specialist membranes
• Requires only the addition of clean water.

Application

Preparation

Mechanically remove all damaged concrete, brick or stone back to a sound core. Except in new construction, expose the full circumference of the steel reinforcement 25mm behind the bars and 50mm beyond visible corrosion. On cutting back, feather edges must be avoided. Step the perimeter of the repair to a depth of 10mm preferably using a power chisel or by saw or disc cutting.

The areas to be repaired must be free from all unsound material including laitance dust, oil, grease, corrosion byproducts and organic growth. Smooth surfaces should be roughened and reinforcement cleaned to bright steel using wet grit blasting techniques or equivalent approved methods. Ø The compressive strength of the parent concrete should be minimum 20 MPa. The prepared substrate should be thoroughly soaked with clean water until uniformly saturated without any standing water.

Treatment of Steel Reinforcement

Treat exposed steel reinforcement with 2 x 1mm coats of STEEL REINFORCEMENT PROTECTOR 841 applied by brush.

Priming of Concrete

Unicem Lite does not generally require a primer. Highly porous substrates may be primed with a POLYMER ADMIXTURE 850 slurry coat. The slurry coat should also be used when treating larger areas of waterproof concrete.

Mixing 

Unicem Lite should be mechanically mixed using a forced action pan mixer or in a clean drum using a slow speed drill and paddle. A normal concrete mixer is NOT suitable. For normal applications, use between 2.7-3.1 litres of clean water per 18kg bag. For part bags, this equates to 6-7 volumes of powder to 1 volume of water. Typically, for high build applications use 2.9 litres of clean water per bag and mix for 2-3 minutes. Mix to entrain as little air as possible. Use without delay. Ø Note - These instructions must be adhered to as Flexcrete will not be responsible for failure due to incorrect mixing.

Placing

Unicem Lite can be applied by float or trowel in single layers up to 100mm. Shuttering may be required to allow for compaction if working to reveals. Care must be taken to ensure that an initial thickness of mortar, typically 5-10mm, is well placed and adhered before building up to larger depths. For multi-layer applications, it is important to ensure that previous layers are well keyed and stable but not fully set (typically 2-6 hours) prior to the application of subsequent layers. No inter-layer priming is required. Final profiling is achieved with a steel float.