Bond(Ex)

DESCRIPTION:

AT-BOND (EX) is a two component epoxy resin based structural bonding agent used for ensuring monolithic bond between old and new concrete and is highly recommended for structural repair works.

STANDARDS:

AT-BOND (EX) complies with ASTM C-881 Type II Class B & C

USES:

• AT-BOND (EX) is used for bonding new cementitious materials to existing cementitious surfaces.
  • AT-BOND (EX) is highly useful for bonding fresh concrete to old concrete that is fully cured.
  • AT-BOND (EX) can be used to bond sprayed concrete/mortar to old concrete surfaces.
  • AT-BOND (EX) can be used on horizontal and vertical surfaces as a repair ingredient to corroded or spalled concrete.
  • AT-BOND (EX) is suitable for:
    • Jacketing applications for strengthening the existing concrete elements like columns, beams, basements etc.
    • As a bonding agent for concrete repairs using cement plaster/screed and for guniting.
    • As waterproof joint in sandwich constructions, etc.

ADVANTAGES:

• Ideal for structural repairs
• Monolithic bond
• Capable of transmitting very high stresses
• Excellent water & alkali resistance
• Can be applied on dry as well as damp surfaces
• Can be cured under moist / wet conditions
• Pre-batched components, hence easy to mix

COVERAGE:

• Concrete : 2 – 2.5 sq.mtr/kg of mixed material per coat
• Steel : 5-6 sq.mtr/kg of mixed material per coat

NOTE: Coverage of AT-BOND (EX) varies with roughness and porosity of surface. As temperature drops, the mixed material becomes thicker and more difficult to spread thus resulting lower yield. If unmixed components have been exposed to the sun and are hot, working life (pot life) will be shortened. AT-BOND (EX) should not be used at temperatures below 10°C and above 35°C. DO NOT ADD SOLVENTS OR WATER TO THIN THE MIX.

INSTRUCTION FOR USE:

• SURFACE PREPARATION
  • All surfaces should be clean and free from surface water, loose particles, oils, grease and other contaminants. Surface should be washed thoroughly with water before the application of AT-BOND (EX).
  • MIXING
    • AT-BOND (EX) comes in pre-batched components. Pour entire quantity of Comp-B into Comp-A and mix thoroughly until an even mix is achieved. Mix the contents with a paint stirrer attached to a low speed (400-600 rpm) electric or pneumatic drill for about 3 minutes. Move the stirrer up and down and around the sides until an even streak-free colour is obtained. Avoid making the mix frothy by whipping in an excessive amount of air.
    • If power is not available, use a steel pallet knife cut off at the tip to give a flat end to reach into corners of the can and mix vigorously by hand for at least 5 minutes. A stick will not provide good mixing
    • Do not mix more epoxy concrete bonding agent than can be used within the pot life of the product. An end to the pot life is indicated by heat buildup in the mixture, followed by solidification. Spreading the material in a flat shallow container will extend the working life.
  • APPLICATION
    • AT-BOND (EX) for bonding new concrete to existing surfaces may be applied and distributed by broom, brush, roller, notched trowel, squeegee or spray gun depending upon the nature of the surface, the size of the area, and the scheduling of the concrete placement.
    • Patches and Vertical Joints – Medium stiff nylon bristle paint brushes.
    • Overlays on Rough Surfaces – Spread with rubber, PVC or polyethylene squeegee or 1/16″ notched trowels. Work into surface with stiff bristle street brooms.
    • Overlays on Flat Smooth Areas – Short nap paint roller fitted with long handle or squeegee.
    • Sandblasted Dry Steel – Medium stiff nylon bristle paint brushes.
    • Large Areas
      • Spray gun with selective brooming in rough spots. Spray apparatus may be two-component equipment that meters, mixes and applies or conventional single component where large batches may be premixed (long pot life types). Airless type spray equipment minimizes overspray and wasted material.
    • Curing: Full curing takes around 5-6 days and it is absolutely essential that the repaired surface be cured properly.
    • Compatibility: AT-BOND (EX) is compatible with all types of concrete, cement based grouts, polymer modified cement systems etc
    • Cleaning:
      • Clean all tools and equipments immediately after use with xylene or toluene.

TECHNICAL DATA SHEET:

PACKAGING & STORAGE:

• AT-BOND (EX) is available in the following pack:
  • 0.6 kg PACK A+B=(0.4+0.2) kg
  • Industrial combi-pack system of 6 kg (4+2 kg) & 30 kg (20+10 kg) on request
• Shelf life is 12 months in sealed containers as provided @ 350C
• Keep containers sealed and away from heat and cold in a well ventilated area

HEALTH & SAFETY:

• Protect hands with rubber gloves and eyes with goggles.
• Accidental splashes to the skin or eyes must be rinsed immediately with clean water.
• Store in well-labeled containers.