071700-Bentonite Waterproofing.pdf

Steam Supply and Condensate Bentonite Waterproofing Return Piping Replacement 071700-1 PGRU, Geneva, NY

SECTION 071700

BENTONITE WATERPROOFING

PART 1 GENERAL

1.1 SUMMARY

A. Section includes bentonite clay waterproofing in panel form and drainage panels.

B. Related Sections:

1. Section 312323 - Backfill.

2. Section 334600 - Subdrainage.

1.2 REFERENCES

A. National Roofing Contractors Association:

1. NRCA - The NRCA Waterproofing and Dampproofing Manual.

1.3 SUBMITTALS

A. Product Data: Submit product criteria, characteristics, accessories, jointing and seaming methods, and termination conditions.

B. Manufacturer's Installation Instructions: Submit special preparation of substrate, panel attachment methods, and perimeter conditions requiring special attention.

C. Manufacturer's Certificate: Certify products meet or exceed specified requirements.

D. Warranty: Submit manufacturer warranty and ensure forms have been completed in Owner's name and registered with manufacturer.

1.4 QUALIFICATIONS

A. Manufacturer: Company specializing in manufacturing products specified in this section with minimum three years documented experience.

1.5 DELIVERY, STORAGE, AND HANDLING

A. Maintain bentonite products dry. Protect with waterproof cover.

B. Maintain minimum ambient storage temperatures of 40 degrees F for bentonite gel products.

1.6 ENVIRONMENTAL REQUIREMENTS

A. Maintain ambient temperatures above 40 degrees F for 24 hours before and during application.

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PART 2 PRODUCTS

2.1 BENTONITE WATERPROOFING

A. Manufacturers:

1. CETCO Model: Volclay Panels.

2. TREMCO Model: Paraseal.

3. Carlisle Coatings & Waterproofing Model: CCW MiraCLAY.

4. Substitutions: Permitted.

2.2 COMPONENTS

A. Bentonite: Granulated pure, dry, self expanding, bentonite clay comprised of 90 percent minimum sodium montmorillonite; 90 percent minimum passing No. 20 mesh sieve and 10 percent maximum passing No. 200 mesh sieve.

B. Single Panels: Single corrugated core, smooth faced Kraft paper panels, core filled with self expanding bentonite clay granules:

1. Nominal Panel Size: 48 x 48 3/16 inches.

2. Minimum Bentonite Fill: 1 lb/sq ft.

3. Minimum Panel Weight: 18 lbs.

C. Joint Packing: Biodegradable Kraft paper containers filled with bentonite clay granules;

1-1/4 inches square or 2-3/8 inch triangular x 24 inches long.

D. Joint Seal: Moist and hydrated bentonite clay gel using water and glycol for below freezing application and water for above freezing application.

2.3 ACCESSORIES

A. Fasteners: Galvanized nails.

B. Adhesive: Manufacturer's recommended type.

C. Polyethylene Sheet: 4 mil thick.

D. Granules: Manufacturer’s recommended type used for horizontal to vertical transitions and for detailing at seams and slab penetrations.

E. Drainage Panel: As recommended by manufacturer.

PART 3 EXECUTION

3.1 EXAMINATION

A. Verify substrate surfaces are smooth and durable; free of matter detrimental to application of waterproofing system.

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B. Verify items penetrating surfaces to receive waterproofing are securely installed.

3.2 PREPARATION

A. Clean and prepare surfaces to receive waterproofing.

B. Remove concrete fins, projections, and form ties.

C. Fill holes, cracks, honeycombs, and voids with bentonite gel seal, minimum 1/8 inch thick, extending minimum 3 inches beyond defect.

D. Seal construction joints with joint seal.

3.3 INSTALLATION - VERTICAL SURFACES

A. Apply single bentonite panels with masonry nails or adhesive, starting at base of foundation.

B. Fold and secure panels around corners with corrugations vertical. Secure unfolded panels with corrugations horizontal.

C. Lap adjoining panels 1-1/2 inches.

D. Stagger vertical joints at mid-panel on succeeding courses.

E. Cut panels parallel to corrugations to prevent bentonite loss.

F. Place joint packing continuous along junction of precast tunnel and base slab and at termination of panels, and at protrusions or penetrations. Secure to prevent movement.

3.4 INSTALLATION - CONCRETE HORIZONTAL SURFACES BELOW GRADE

A. Apply single bentonite panels with masonry nails or adhesive.

B. Fold and secure panels around corners with corrugations vertical.

C. Lap adjoining panels 1-1/2 inches.

D. Stagger vertical joints minimum 16 inches on succeeding courses.

E. Cut panels parallel to corrugations to prevent bentonite loss.

F. Extend panels down vertical surfaces minimum 12 inches to overlap vertically applied bentonite panels.

G. Lay bentonite joint seal continuous along and around protrusions, penetrations, and at abutting walls. Secure to prevent movement.

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3.5 INSTALLATION - ACCESSORIES

A. Apply bentonite packing and sealer at construction joints.

B. Place drainage panel directly against membrane, butt joints, place to encourage drainage downward.

3.6 PROTECTION OF INSTALLED CONSTRUCTION

A. Do not permit traffic over unprotected or uncovered waterproofing.

B. Protect installed waterproofing from precipitation or ground water with temporary polyethylene sheeting. When backfilling begins, remove sheeting.

3.7 SCHEDULE

A. Precast Concrete Tunnel Walls and Top: Single panel waterproofing, one additional panel at inside and external corners.

END OF SECTION