Godrej City Panvel

Location
Panvel/Thombre Wadi

Product Used
Product Used: Combiflex tape, aluminium sheets- 1.5mm & 2mm thick, backer rod with diameter 25mm & 40mm, SS screw with washer, thinner, Sika Flex sealant, masking tape
Product Details: Sikadur 31C (Comp A/Comp B), Sikadur Combiflex SG-20P 150, Sikadur Combiflex SG-10P 150, Sikadur Combiflex SG-20P 500, Sika PU sealant, Sika primer, Sika Monotop 122F, Cryso primer, Cryso PU coating, 2mm aluminium plate, aluminium sheet- commercial grade

Problem/ Issues Faced
No issues.

Uniqueness of the product application
Sealant filling and expansion joint

Customer Feedback
10 years warranty, and up till now, no drawbacks from the product.

Application Procedure

Procedure: Surface preparation is one of the most important criteria for good adhesion with resin systems such as the Sikadur epoxy adhesives, which have excellent adhesion on many different substrates, correctly prepared as follows:

1. Requirements for the substrate prior to preparation:
   Any weak or damaged concrete must be removed, and any surface defects such as blowholes or voids must be fully exposed and repaired if required.
   Concrete and cement mortars must be older than 28 days (according to the minimum substrate strength requirements). Confirm the substrate strength (concrete, masonry, natural stone, etc.). If in doubt, make a test area first.
   The substrate surfaces must all be sound, clean, and free from contaminants such as dirt, oil, grease, rust, existing surface treatments, and coatings. All loose particles must be removed.
   The substrate must be dry or mat damp and free from any standing water, ice, etc. If in doubt, make a test area first and confirm the bond strength with pull-off testing equipment.
2. Tape Preparation:
   If there is any dirt on the tapes, clean their surface with a clean, dry, or damp cloth. Use water and no solvents for this cleaning.
   Check the integrity of the Sikadur Combiflex SG tapes to ensure that there is no damage from storage and transport. Remove any damaged sections if necessary.
3. Masking Tape:
   For installation on expansion joints or cracks > 1mm, the center of the tape must not be bonded to the joint filler or substrate. In these situations, apply masking tape on top of the joint/crack and on both outer sides of the prepared joint/crack area before applying the adhesive.
4. Mixing Pre-Batched Units:
   Stir each component, and then mix parts A + B together in the part A tin for at least 2 minutes with a resin mortar mixing paddle attached to a slow-speed electric drill (max. 500 RPM) until the material becomes smooth in consistency and a uniform grey color. Avoid aeration while mixing.
   Then, pour the whole mix into a clean container and stir again for approximately 1 more minute at low speed to keep air entrapment at a minimum. Mix only that quantity which can be used within its pot life.
5. First Layer of Sikadur® Adhesive:
   Apply the mixed Sikadur® adhesive on both sides of the joint/crack onto the prepared substrate using a suitable brush, trowel, or spatula. If the concrete substrate is damp, force the adhesive firmly into the substrate. The thickness of this layer of adhesive should be 1-2mm, and the width on each side of the joint/crack should be at least 40mm.
6. Sikadur-Combiflex® SG Tape Application:
   Apply the Combiflex SG tape within the open time of the adhesive. Press the tape firmly, without entrapping air, into the adhesive using a suitable roller.
   The adhesive should be squeezed out on both sides of the tape by approximately 5mm. For expansion joints/cracks > 1mm, apply the Sikadur Combiflex® SG 20 M tape with the central facing upwards. In situations with high joint movement, place the tape into the joint as a loop.
7. Top Layer of Sikadur® Adhesive:
   Let the first layer of the Sikadur® adhesive stiffen and begin to harden before the top layer is applied.
   Apply the top layer of adhesive at a thickness of approximately 1mm on both sides of the joint/crack, producing a fully covering layer that tapers outwards to almost zero.
8. Remove Masking Tape and Central Strip:
   Remove the outer edge masking tapes, then remove the central masking tape to ensure a neat and precise detail.
9. Tape Connections:
   The Sikadur-Combiflex SG tape ends are connected by hot air thermal welding. The welding area must be prepared by abrading and roughening the surface with Scotch-Brite pads or sandpaper. Roughen the tapes only in the welding areas, otherwise, their adhesive bond can be affected.
   All Combiflex SG tape welded overlaps have to be 40-50mm.
10. Hot Air Welding:
    The Sikadur-Combiflex SG tape ends are connected by hot air thermal welding. Overlaps are to be 40-50mm. Solvents such as Sika Colma Cleaner do not improve the welding properties.”