UNIBOND SB (L)

UNIBOND SB(L), an acrylic polymer, helps in strong adhesion of layers of concrete, in new constructions and rehabilitation.

UNIBOND SB (L) CHARACTERISTICS

State : Liquid
Colour : Blue

Concrete Repair

Concrete Repair

Universal Construction Chemicals

Concrete Repair

Concrete Repair

Concrete Repair

Universal Construction Chemicals

Concrete Repair

UNIBOND SB (L) APPLICATIONS

  • In repair of damaged RCC structures.
  • In repair of damaged industrial floors and RCC tanks.
  • For restoration of old buildings.
  • For repair of honeycombed structure
  • For bonding of layers of concrete in new construction (construction joints).
  • Mixed along with cement grout to stop water leakages.

UNIBOND SB (L) ADVANTAGES

  • Provide strong bonding between old & new concrete and helps absorb stresses due to differential expansion and contraction.
  • Improves water impermeability.
  • Provides high compressive, tensile & flexural strength.

UNIBOND SB (L) GUIDELINES FOR USE

Polymer Modified Mortar

  • After exposing the reinforcement, it is cleaned with wire brush
  • The loose concrete around this area is then chipped away and removed.
  • Mix UNIBOND SB(L) and cement in 1:1 ratio to form a consistent slurry.
  • Apply a bond coat using the above slurry with a fine brush to all the exposed concrete.
  • While the bond coat is still tacky, apply the UNIBOND SB(L) polymer mortar in paste or dough form (the ratios and procedure as shown below), build it up layer by layer, with each layer being not more than 15-20 mm at a time.
  • After the first layer is applied it is left to dry for 24 hours before the second layer is applied.
  • The process is repeated till the old concrete thickness is re-achieved.

Proportions

UNIBOND SB (L) : I part by weight
Cement : 5 parts by weight
Quartz / River sand : 15 parts by weight (for beams and columns a mix of fine and coarse quartz / river sand in the ratio 40:60, while for slabs the fine to coarse ratio is 60:40)

The above are mixed till a dough-like consistency is reached. Small quantity of water (about 3 - 5% by weight of mortar mixture) may be added to help achieve ideal workability of the dough. A rough test to check the ideal work ability is to drop a fist sized ball made of this dough into the dough mixture from shoulder height. The dough should not shatter on impact. 8. After the polymer mortar has built up the concrete to its original thickness, the treated area is to be kept moist for 4 - 5 days before the final plaster coat is done in the usual manner.

Polymer Cement Grout

  • Take 1 kg of UNIBOND SB(L), 4 kg of cement and 2 - 3 kg of water (depending on the flow required) (Polymer : Water : Cement = 1 : 2-3 : 4) by weight.
  • Mix UNIBOND SB(L) and water for about 2 minutes.
  • Add this solution to the cement and mix till a consistent slurry is formed.
  • Grout as recommended.
  • Any modification in the proportion may be made in consultation with your RCC consultant or our technical services.

Storage

Stable under normal conditions. Should be stored away from direct sunlight.

Handling

Use of gloves and safety glasses is recommended.

Packing

Available in1 kg, 5 kg, 10 kg, 20 kg and 50 kg.