Cement Bond Coat




Dubond’s Hydrobuild SBR Latex is modified Styrene butadiene Rubber emulsion specially designed for use as a bonding agent. It is suitable as an admixture for obtaining waterproof concrete, plasters and mortars it is also suitable for preparation of repair mortars. Damaged and spalled concrete repair of large cracks.

Green Building Rating

  • Low Emission
  • Solvent <5g/kg
  • Low Ecological Impact
  • Health Care
  • Water Based


Areas of Application

  • Concrete repair and adhesive mortar, screed.
  • Roof Finishing.
  • Rendering and coating.
  • To be used as bonding agent for old concrete to new concrete.
  • As a Bond coat before commencement of repair work.


Features & Benefits

  • Single component, gauged as required.
  • Simple to use.
  • Provides excellent bond to concrete, adhesion plaster, masonry, stone work, etc.
  • Provides waterproof screeds, plasters.
  • Improved tensile and flexural properties strength allows thin applications.
  • Compatible with all common hydraulic cements.
  • Economical to use.
  • Gives weather resistant mortar with improved durability impermeability to chlorides and other harmful agents.


Method of Application
The base must be clean and free from loose particles. Unsound areas should be removed until sound concrete is located. Any cracks, pot holes etc should be properly sealed and cured. The surface to be treated should be free from all coatings dust and unsound concrete toppings. The unsound parts should be chipped off to arrive at sound surface. Smooth substrates must be mechanically roughened e.g. by scrabbling, needle gun or grit blasting to provide an adequate key. Corroded reinforcing
steel should be exposed around its full circumference and cleaned to remove all loose scale and corrosion deposits. It is always preferably to clean the steel to a bright condition. Use of emery cloth, grit or sand blasting, or Dubond Rust Remover / Dubond ZRP is recommended

Priming
Reinforcing steel must be primed with Dubond ZRP immediately after cleaning with water. The concrete substrate should be thoroughly dampened with water and any excess removed before being primed by thoroughly scrubbing in a slurry coat of 1 volume Hydrobuild SBR Latex to 1 volume water to 3 volumes fresh cement. In order to obtain a smooth consistency the cement should be blended slowly into the liquids. Stir frequently during use Hydrobuild SBR Latex Cement Mortar and screed modifier cum bonding agent to offset settlement. Avoid 'peddling' of the slurry coat. The topping must be applied on to the wet slurry. If the slurry driesout it must be removed and the clean substrate re primed.

  • Application
  • For patching and repair mortars and plaster for masonry :
  • 50 Kgs- cement
  • 145 Kgs – Zone II sand
  • 10 Kgs – Hydrobuild SBR Latex
  • 10 - 13 liter – Recommended water
  • 10 mm - 30 mm – recommended thickness
  • Mix the total mass till proper mixing of Hydrobuild SBR Latex with a proper consistency is achieved.


For Heavy duty floor screeds

  • Cement - 50 kg
  • 4 mm Granite chips - 75 kg
  • Zone II sand - 75 kg
  • Hydrobuild SBR Latex - 10 Kgs
  • Recommended Water addition 6-10 liters
  • Recommended Thickness- 12mm - 24 mm
  • The screed should be of a semi-dry cohesive consistency.


Precautions & Limitations

  • Prepare surfaces thoroughly. Toe-in at edges wherever possible to avoid feather edging.
  • All surfaces including edges must be primed.
  • All applications should be wet on wet; the primer must not be allowed to dry.
  • The level of added water in the mix designs may need adjusting to achieve the required consistency. In general water content should be kept to the minimum necessary.
  • For consistent performance the use of clean, dry river sand is recommended. Where wet sand is used, reduce the added water level as appropriate.
  • In order to prevent rapid drying, mortars should be properly cured curing compound, cur Protect uncured mortar from frost.
  • Do not retemper mortar or primer after initial set.
  • Minimum application temperature is 10˚C.


Properties

  • Typical mechanical properties of 1: 3 cement sand mortar at W/C - 0.45 for control and W/C - 0.35 for mortar containing Hydrobuild SBR Latex (10 liters / 50 kg cement).
  • Tested in accordance with BS 6319 & wet cured.


Health & Safety Instructions
Hydrobuild SBR Latex should not come in contact with skin and eyes or be swallowed. Protective gloves and goggles should be worn. Hydrobuild SBR Latex should not come in contact with skin and eyes or be swallowed. If contact with skin occurs, wash well with soap and water. Eye contamination should be washed thoroughly with clean water and medical advice sought. If swallowed seek medical attention immediately. Do not induce vomiting.


Specifications

Cleaning Tools and equipment should be washed with water immediately after use.
Base Modified SBR emulsion
Color Milky White
Specific Gravity app. 1.00
Solid Contents 34 %
pH Value 10.5 – 11.5
Viscosity 120 Mpa
Surface Tension app 50 mN/m
Glass transition Temperature -6˚C / 21.2˚F
Minimum film form temperature 0˚C / 32˚ F
Breaking Load 4.0 N / mm²
Compressive Strength (kg/cm²) 3 days 115 - 125
Compressive Strength (kg/cm²) 7 days 130 - 145
Compressive Strength (kg/cm²) 28 days 200 - 220
Tensile Strength (N/mm²) @ 28 days 25 - 32
Flexural Strength (N/mm²) @ 28 days 40 - 50
Shelf Life & Storage 12 months if sealed packing and if stored in cool dry place in shaded area.

Additional Information

Packaging Details 500 ml, 1 ltr, 5 ltr & 20 ltr container.




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