Sikalastic® Vehicular Traffic 2850

• CSA S413
• ASTM C 957

• Sikalastic® M 270 NP 
• Sikalastic® TC 275 
• Sikalastic® TC 299 FS

 After top coat, allow an additional 2–3 hours before opening to vehicular traffic. Extend the curing time in cool-weather conditions.

Concrete

1. Concrete must be fully cured (28 days), structurally sound, clean and dry (ASTM D 4263). All concrete surfaces (new and old) must be shot blasted to remove previous coatings, laitance and all miscellaneous surface contamination and to provide profile for proper adhesion. Abrasive shot blasting must occur after concrete repair has taken place. Acid-etching is not permitted. Proper profile should be a minimum of ICRI CSP- 3 (as described in ICRI document 03732.) For balconies and other pedestrian areas with limited space or access for shot-blasting, alternative mechanical methods can be used to achieve the recommended surface profile. 

2. Repair voids and delaminated areas with Sika-branded cementitious and epoxy patching materials. For application when fast turn repairs are required, Sikalastic®-350 can be used to repair patches up to 1.5" in depth when used in the aggregate slurry mix. Please refer to the Sikalastic®-350 product data sheet for proper application techniques. 

3. All units must be applied within the specified pot life.

Surface Pre-Striping and Detailing

1. For non-moving joints and cracks less than 1⁄16" (1.6 mm) wide, apply 25 wet mils (0.6 mm) prestriping of Sikalastic® M 270 NP. Sikalastic® M 270 NP must be applied to fill and overlap the joint or crack 3" (76 mm) on each side. Feather the edges.

2. Dynamic cracks and joints over 1⁄16" (1.6 mm) wide must be routed to a minimum of ¼ by ¼" (6 by 6 mm) and cleaned. Install bond breaker tape to prevent adhesion to bottom of joint. Fill joints deeper than ¼" (6 mm) with appropriate backer rod and Sikaflex® SL 1™/ SL 2™ (slope grade or selfleveling) or Sikaflex® NP 1™/ NP 2™. For cracks, sealant should be flush with the adjacent surface. For expansion joints, sealant should be slightly concave. After the sealant has cured, apply 25–30 wet mils (0.64–0.77 mm) of Sikalastic® M 270 NP pre-stripping over the cured sealant, overlap the joint 3" (76 mm) on each side.

3. Sealed joints 1" (25 mm) wide or less can be coated over with the Sikalastic® Traffic system. Expansion joints exceeding 1" (25 mm) wide, including the primary wide expansion-joint system, are not to be coated so they can perform independently of the deck coating system.

4. Form a sealant cant into the corner at the junction of all horizontal and vertical surfaces (wall sections, curbs, columns) and apply a 1" (25 mm) wide bead of Sikaflex® NP 1™/ NP 2™. Tool to form a 45° cant. Apply masking tape to the vertical surfaces 4–5" (102–127 mm) above the sealant cant to provide a clean termination of the vertical detail coat. After the sealant has cured, apply 25 wet mils (0.64 mm) of Sikalastic® M 270 NP over the cured cant up to the masking tape and 4" (102 mm) onto deck surface. 

5. Where the coating system will be terminated and no wall, joint, or other appropriate break exists, cut a ¼ by ¼" (6 by 6 mm) keyway into the concrete. Fill and coat keyway during application of Sikalastic® M 270 NP.

6. In locations of high movement such as wall and slab intersections, a reinforcing fabric is required. After the sealant cant bead is applied and cured, apply 25 wet mils of Sikalastic® M 270 NP over the sealant and embed Sikalastic® Fleece-996 reinforcing fabric into the wet detail coat. 

Uncoated Metal Surfaces

1. Remove dust, debris and any other contaminants from vent, drain pipe and post penetrations, reglets and other metal surfaces. Clean surfaces to near white per SSPC-NACE2 and prime with appropriate Sikaflex Primer. Provide appropriate cant with Sikaflex® NP 1™/ NP 2™ sealants to eliminate 90° angles.

Please refer to the specific PDS for Mixing instructions.

For Sikalatic® TC 299 FS MMA Sikalastic® 918 FS is required to cure, please refer to the PDS for Mixing and dosage instructions.

Heavy-Duty Traffic System

1. Apply 25 wet mils (0.64 mm) of Sikalastic® M 270 NP with proper notched squeegee at the rate of approximately 60 ft² /gal (1.47 m²/L). Allow base coat to cure 3-4 hours. 

2. Apply 20 wet mils (0.30-0.51 mm) of Sikalastic® TC 275 intermediate topcoat using a properly notched squeegee at the rate of approximately 80 ft² /gal (1.47 m²/L). Immediately back roll to evenly level Top Coat.

3. AGGREGATE TO REFUSAL METHOD Immediately broadcast aggregate 16-30 mesh, rounded silica sand into the wet coating at the rate of 20-30 lbs per 100 ft² (1.0-1.5 kg/m²). Immediately after the aggregate is broadcast and while the coating is still wet, blow any excess aggregate via a portable blower forward into the wet coating. Do not overlap aggregate: it is acceptable to have localized wet spots in the aggregate surface after completion of this method. This process requires coordination between all members in the work crew. The blower operator wearing clean spiked shoes, should blow the excess aggregate forward towards the freshly applied and backrolled topcoat. In this method, the coating should not accept additional sand, minimal excess aggregate is on the surface, less aggregate is used and the textured appearance should be fairly uniform.

4. Allow to cure 4-6 hours or until there is no moisture on the surface of the aggregate/membrane. Remove all excess or loose aggregate by sweeping or vacuuming before application of the topcoat. Apply the Sikalastic® TC 299 FS immediately after mixing by pouring directly onto the primed and cured deck surface. Distribute by means of heavy nap, solvent-grade roller, brush or squeegee to tired thickness, at the rate of 25 wet mills or 60 ft²/ gal (1.47 m²/L).

5. Top coat will cure in one hour. Wait 3 hours before opening to traffic. Existing environmental conditions effect the allowable time period. 

Important Note: All coverage rates are approximate and may vary due to the application technique used. Coverage rates are affected by substrate texture, choice and distribution of aggregate, intermediate aggregate load and environmental conditions and application methods and are not under the control of Sika. Ensure that an adequate amount of aggregate is utilized to achieve required slip resistance.

MOCK-UP

1. Provide mockup of at least 100 ft² (9.3 m²) to include surface profile, sealant joint, crack, flashing and juncture details and allow for evaluation of slip resistance and appearance. 

2. Install mockup with specified coating types and with other components noted. 

3. Locate where directed by architect. 

4. Mockup may remain as part of work if acceptable to architect.

Clean tools with Sikafloor 100 CLN Pronto, an MMA solvent. Other solvents such as Xylene or acetone may also be used. Collect and dispose of all site waste.