Polymer bonding aid and mortar additive

Strubond Acro8 is a modified styrene Acrylic emulsion designed to improve cementitious mortars and slurries.

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Advantages

• Single component liquid can be easily gauged as required
• Improves cohesion and workability
• Provides waterproof repairs resistant to freeze/thaw cycling
• Improved tensile and flexural properties for thin applications
• Excellent bond to concrete, masonry, stonework, plaster, and blockboard
• Contains no chloride admixtures

Description

Strubond Acro8 is a modified styrene Acrylic emulsion supplied as a ready-to-use white liquid, designed for improving cementitious mortars and slurries. It is resistant to hydrolysis and suitable for internal and external applications.

Preparation:

• Form the extremities of the application area to a depth of at least 10 mm to avoid feather-edging and to provide a square edge. Ensure a minimum depth of 6 mm is observed in the remaining area, up to the previously formed edge. Clean the surface and remove any dust, unsound or contaminated material, plaster, oil, paint, grease, corrosion deposits or algae. Oil and grease deposits should be removed by steam cleaning, detergent scrubbing or the use of a proprietary degreaser. Where breaking out is not required, roughen the surface and remove any laitance by light scabbling or grit-blasting. The effectiveness of decontamination should then be assessed by a pull-off test.

Substrate priming:

• The substrate should be thoroughly soaked with clean water and any excess removed prior to commencement. A slurry primer should be prepared consisting of 1 volume Strubond Acro8 to 1 volume clean water to 3 or 4 volumes fresh cement. To obtain a smooth consistency, the cement should be blended slowly into the premixed liquids. The slurry primer should be stirred frequently during use to offset settlement.
• The slurry primer should be scrubbed well into the surface of the substrate, being careful to avoid ‘ponding’. The repair mortar, topping or render must be applied on to the wet slurry primer. If the slurry primer dries before application of the mortar, it must be removed and the area reprimed before continuing.

Preparation of reinforcement (repairs only):

• Expose fully any corroded steel in the repair area and remove all loose scale and corrosion deposits. Steel should be cleaned to a bright condition paying particular attention to the back of exposed steel bars. Grit-blasting is recommended for this process. Where corrosion has occurred due to the presence of chlorides, the steel should be high-pressure washed with clean water immediately after grit-blasting to remove corrosion products from pits and imperfections within its surface.

Packaging & Storage & Curing & Cleaning

• Strubond Acro8 mortars, toppings and renders are cement based. In common with all cementitious materials, they must be cured immediately after finishing in accordance with good concrete practice. The use of Strubond Acro7 or Strucure Lata, sprayed on to the surface of the finished mortar in a continuous film, is recommended. In harsh drying conditions, supplementary curing with polythene sheeting must be used.
• Strubond Acro8 and Strubond Acro7 should be removed from tools, equipment and mixers with clean water immediately after use. Cured material can only be removed mechanically.
• Strubond Acro8 is available in 4 & 20 Kg containers.
• Strubond Acro8 has a minimum shelf life of 6 months at 35°C if kept in a dry store in the original, unopened packs. The shelf life will be reduced at higher ambient temperatures.

Health and safety

Strubond Acro8 is alkaline and should not come into contact with skin or eyes. Use proper safety gear.

Fire

Strubond Acro8 is non-flammable.