M-CRETE 500 – Concrete Leak-Stop System

• Mechanically remove all damaged concrete and masonry back to a sound core.
• Joints and cracks should be square cut or ideally dovetail cut out to a minimum depth and width of 20mm. On cutting back, feather edges and V-cuts must be avoided.
• The perimeter of the area should be broken to a depth of 10mm preferably using a power chisel. 
• The areas to be treated must be free from all unsound material, i.e. dust, oil, grease, corrosion by products and organic growth.
• Smooth surfaces should be roughened, and all loose material and surface laitance removed using high-pressure water techniques.  
• The prepared substrate should be thoroughly soaked with clean water until saturated with no standing water.

• M-CRETE  500 – should be mixed by hand in a clean plastic or rubber bucket.
• Ideally no more than 0.5kg at a time, using a mixing ratio of 1 part water to 3/4 parts M-CRETE 500.
• Adjust the mix ratio accordingly to give a putty-like consistency.
• Mixing time must not exceed 2minutes.

• The mixed material should be formed into a ball (wearing gloves) until the product stiffens slightly.
• Then forced into the void and held in place firmly for 1-2 minutes until setting occurs.
• When sealing joints in pipework or forming a fillet at a wall/floor angle, a steel float or coving trowel may be used to produce the desired finish. 
• Once the M-CRETE 500 – Concrete Leak Stop has been placed and stiffened sufficiently, the surface should be kept in a damp condition  for a minimum of 15 minutes to aid curing. 
• The cured repair mortar shall set in 2 minutes at 20°C, achieving a compressive strength of 4MPa in 1 hour and 26MPa in 28 days.

Compressive Strength Development @ 20°C

• 1 hour: 4.0MPa 1 day: 11.0MPa
• 2 hours: 5.0MPa 7 days: 19.5MPa
• 4 hours: 8.0MPa 28 days: 26.0MPa
• Mixed Density: 2150kgs/m³
• Mixed Colour: Concrete grey
• Min Application Thickness: 20mm
• Final Setting Time: 2-3 minutes at 20°C.

• M-CRETE 500 APG PDF