071800 Traffic Coatings ADDENDUM.pdf

St. Cloud VAMC August 21, 2020

Construct Parking Structure for Patient Access Bid Documents

St. Cloud, MN 56303 Project No: 656-344

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SECTION 07 18 00

TRAFFIC COATINGS

PART 1 - GENERAL

1.1 DESCRIPTION:

A. This section specifies the application of high-solids, fluid-applied, polyurethane, waterproofing, traffic-bearing, membrane deck coating system.

1.2 RELATED WORK:

A. Section 033000 Cast in Place Concrete.

1.3 TEST AREA:

A. Before start of general application, apply the elastomeric coating as specified in a representative test area. Provide a test area not less than 9.29 square meters (100 square feet). The area to be covered by the coating to include all site conditions such as flashings bases, corners and projections through the coating. Provide test area in location determined by the Contracting Officer Representative (COR).

After COR approval, area will serve as an example for the remaining work.

1.4 SUBMITTALS:

A. Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT

DATA, AND SAMPLES.

B. Manufacturers Literature and Data: Each material, indicating compliance with specification requirements.

C. Samples: Each finish color on 101 by 203 mm (4 by 8 inch) substrate, layered to show each coat and finish.

D. Installer qualifications.

E. Manufacturer warranty.

1.5 WARRANTY:

A. Construction Warranty: Comply with FAR clause 52.246-21 “Warranty of

Construction”.

B. Manufacturer Warranty: Manufacturer shall warranty their traffic coating for a minimum of five (5) years from the date of installation and final acceptance by the Government. Submit manufacturer warranty.

1.6 DELIVERY AND STORAGE:

A. Deliver materials to the site in original sealed containers, clearly marked with manufacturer's name and brand, and type of material.

St. Cloud, MN 56303 Project No: 656-344

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B. Store materials in weathertight and dry storage facility. Protect from damage from handling, weather and construction operations before, during and after installation. Store materials at temperatures and under conditions recommended by the manufacturer.

1.7 ENVIRONMENTAL REQUIREMENTS:

Do not proceed with application of materials when ambient temperature is less or greater than that recommended by the coating material manufacturer. Do not apply traffic coatings to damp or wet substrates, when relative humidity exceeds 85 percent, or when temperatures are less than 3 deg C (5 deg F) above dew point.

1.8 SAFETY REQUIREMENTS:

Keep products away from heat, sparks and flame. Do not permit use of spark-producing equipment during application of flammable products or where explosive fumes are present.

1.9 QUALITY ASSURANCE:

A. Manufacturer’s Qualifications: Obtain products from single manufacturer or from sources recommended by manufacturer for use with traffic coatings system and incorporated in manufacturer’s warranty.

B. Installer’s Qualifications: Work to be performed by installer having three (3) years’ experience for work relating to this section and approved in writing by traffic coating manufacturer.

1.10 APPLICABLE PUBLICATIONS:

A. The publications listed below form a part of this specification to the extent referenced. The publications are referenced in the text by basic designation only.

B. ASTM International (ASTM):

C 957...................Standard Specification for High-Solids Content, Cold Liquid-Applied Elastomeric Waterproofing

Membrane With Integral Wearing Surface

St. Cloud, MN 56303 Project No: 656-344

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PART 2 - PRODUCTS

2.0 BASIS OF DESIGN PRODUCT:

A. Provide BASF Corporation MasterSeal Traffic 2500 Deck Coating System or approved equal.

2.1 MATERIALS:

A. Primer: two-component, polyurethane-based adhesive primer. (Basis of

Design: MasterSeal P 255)

B. Base coat: two-component, fast-curing, polyurethane base coat. (Basis of Design: MasterSeal M 265)

C. Top Coat: two-component, fast-curing, aromatic polyurethane top coat.

(Basis of Design: MasterSeal TC 275).

2.2 ACCESSORIES:

1. Aggregate: MasterSeal 941DR or equal.

2. Sealant Primer: MasterSeal P 173 or equal.

3. Sealant: MasterSeal SL 2 or MasterSeal CR 195 or equal.

4. Deep Joint Sealant: MasterSeal SL 2 or MasterSeal NP 2 or equal.

PART 3 - EXECUTION

3.1 SURFACE PREPARATION:

A. Apply to clean, dry surfaces. Smooth rough spots and tool marks.

B. Fill holes, depressions and cracks with fillers compatible with the coating material and recommended by the coating manufacturer.

C. Subsurface imperfections that telegraph through the finish coating surface are not acceptable.

3.2 CONCRETE

A. Minimum Compressive Strength: 3,000 psi (21 MPa).

B. Cure concrete for a minimum of 28 days.

C. Ensure concrete is structurally sound, clean and dry in accordance with

ASTM D4263.

D. Repair voids and delaminated areas.

E. Shot blast concrete to remove dirt, dust, grease, oil, coatings, laitance and other surface contamination and to provide profile for proper adhesion.

F. Profile: Minimum of ICRI CSP-3 (approximately 80 to 100-grit sandpaper).

G. Prestripe and prepare cracks, joints and detail work in accordance with manufacturer’s instructions.

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3.3 WORK COORDINATION:

A. To provide a watertight installation, coordinate this work with flashing and drains required to be installed before the coating work begins and be completed after the coating is in place.

3.4 MIXING:

A. Mix material components in accordance with manufacturer’s instructions.

B. Precondition material components to a temperature of 70 degrees F (21 degrees C) before mixing.

3.5 APPLICATION:

A. Primer: Prime surfaces to receive elastomeric waterproofing materials as recommended by the product manufacturer with a thickness of not less than .1 mm (4 mils).

B. Where horizontal surfaces intersect vertical surfaces, provide a sealant type fillet as recommended by the manufacturer.

C. Base Coat: Apply elastomeric base coat at a rate that will ensure a dry film thickness of not less than 0.5 mm (25 mils). Allow base coat to cure 3 to 4 hours.

D. Intermediate Coat: Apply elastomeric intermediate coat at a rate that will ensure a dry film thickness of not less than .5 mm (25 mils).

Immediately backroll to level material.

E. Aggregate: Immediately broadcast aggregate to refusal into wet intermediate coat. Allow curing time of 3 to 4 hours.

F. Remove excess aggregate.

E. Top Coat: Apply 15 wet mils (.040) top coat. Immediately backroll to level material.

3.4 CLEANING:

A. Remove smears of elastomeric material from other work.

3.5 PROTECTION:

A. Allow minimum curing time of 24 hours before allowing vehicular traffic onto deck coating system. Protect the finished coating from traffic until the coating cures and afterward until final acceptance.

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