36C24218B0051-00002001.pdf

James J. Peters VA Medical Center Clean and Reseal Building Exterior

VA Project No. 526-14-105

03 0100 MAINTENANCE OF CONCRETE Page 1 of 3

PART 1 GENERAL

1.01 SECTION INCLUDES

SECTION 03 0100

MAINTENANCE OF CONCRETE

A. Cleaning of existing concrete surfaces.

B. Repair of exposed structural, shrinkage, and settlement cracks.

C. Resurfacing of concrete surfaces having spalled areas and other damage.

D. Repair of internal concrete reinforcement.

E. Scope of Work: All exposed concrete within the work area and as indicated on the drawings.

1.02 REFERENCE STANDARDS

A. ASTM C928/C928M - Standard Specification for Packaged, Dry, Rapid-Hardening Cementitious

Material for Concrete Repairs; 2009.

B. AWS D1.4/D1.4M - Structural Welding Code - Reinforcing Steel; American Welding Society;

2011.

1.03 ADMINISTRATIVE REQUIREMENTS

A. Scheduling: Perform blast cleaning only between the hours of 8:00 am to 5:00 pm.

1.04 SUBMITTALS

A. See Section 01 33 23 for submittal procedures.

B. Product Data: Indicate product standards, physical and chemical characteristics, technical specifications, limitations, maintenance instructions, and general recommendations regarding each material.

C. Qualification Statements.

1.05 QUALITY ASSURANCE

A. Cleaner Qualifications: Company specializing in, and with minimum of 3 years of experience in, the type of cleaning specified.

1.06 MOCK-UP(S)

A. Test each type of maintenance procedure required on each type of existing construction, to determine the most appropriate procedures to use and as a record of expected results.

B. Clean a 2 ft. by 2 ft. panel of wall to determine extent of cleaning C. Locate mock-up where directed by COR.

D. Acceptable panel and procedures employed will become the standard of work of this section.

E. Mock-up may remain as part of the work.

PART 2 PRODUCTS

2.01 CLEANING MATERIALS

A. Masonry cleaning shall be equivalent or approved equal to the test locations shown on next page.

For reference purposes: the test cleaning was performed using PROSOCO; 2010 Surface Cleaner (www.prosoco.com). Contractor must match the cleanliness of the test locations by performing a mock-up area per section 1.06 MOCK-UP for requirements.

http://www.prosoco.com/

03 0100 MAINTENANCE OF CONCRETE Page 2 of 3

Before After

Test Locations

2.02 CEMENTITIOUS PATCHING AND REPAIR MATERIALS

A. Manufacturers:

1. ARDEX Engineered Cements: www.ardexamericas.com.

2. BASF Construction Chemicals-Building Systems: www.buildingsystems.basf.com.

3. Prospec, an Oldcastle brand: www.prospec.com.

4. The QUIKRETE Companies: www.quikrete.com.

5. or an approved equal.

B. Cementitious Resurfacing Mortar: One- or two-component, factory-mixed, polymer-modified cementitious mortar designed for continuous thin-coat application.

1. In-place material capable of withstanding freeze/thaw conditions.

2. Mixed with water or latex type bonding agent in proportions as recommended by manufacturer.

3. Color: Light gray.

4. Products:

a. L&M Construction Chemicals, Inc; Duracrete: www.lmcc.com.

b. Prospec, an Oldcastle brand; CR Concrete Resurfacer: www.prospec.com.

c. Prospec, an Oldcastle brand; Vinyl Concrete Patch: www.prospec.com.

d. SpecChem, LLC: Duo Patch: www.specchemllc.com.

e. SpecChem, LLC: Final Finish: www.specchemllc.com.

C. Cementitious Repair Mortar, Trowel Grade: One- or two-component, factory-mixed, polymer-modified cementitious mortar.

1. In-place material capable of withstanding freeze/thaw conditions.

2. Mixed with water or latex type bonding agent in proportions as recommended by manufacturer.

3. Dry Material: ASTM C928/C928M.

4. Products:

a. Adhesives Technology Corporation; HARD-ROC Jet Patch: www.atcepoxy.com.

b. The QUIKRETE Companies; QUIKRETE® FastSet™ Repair Mortar:

www.quikrete.com.

c. SpecChem, LLC; SpecPatch: www.specchemllc.com.

d. Meadow-Crete GPS: www.wrmeadows.com.

http://www.ardexamericas.com/ http://www.buildingsystems.basf.com/ http://www.prospec.com/ http://www.quikrete.com/ http://www.lmcc.com/ http://www.prospec.com/ http://www.prospec.com/ http://www.specchemllc.com/ http://www.specchemllc.com/ http://www.specchemllc.com/ http://www.atcepoxy.com/ http://www.quikrete.com/ http://www.specchemllc.com/ http://www.specchemllc.com/ http://www.wrmeadows.com/

03 0100 MAINTENANCE OF CONCRETE Page 3 of 3

2.03 EPOXY PATCHING AND REPAIR MATERIALS

A. Manufacturers:

1. Adhesives Technology Corporation: www.atcepoxy.com.

2. SpecChem, LLC: www.specchemllc.com.

3. W.R. Meadows, Inc: www.wrmeadows.com.

B. Epoxy Repair Mortar: Epoxy resin mixed with aggregate and other materials in accordance with manufacturer's instructions for purpose intended; conform to pot life and workability limits.

1. Products:

a. Adhesives Technology Corporation; Crackbond LR-321: www.atcepoxy.com.

b. SpecChem, LLC; SpecPoxy 1000, SpecPoxy 2000, SpecPoxy 3000 or SpecPoxy

3000 FS: www.specchemllc.com.

c. W.R. Meadows, Inc.; Rezi-Weld Gel Paste, Rezi-Weld Gel Paste State, Rezi-Weld

1000, Rezi-Weld LV, or Rezi-Weld LV State: www.wrmeadows.com.

C. Epoxy Bonding Adhesive: Non-sag, two-part, 100 percent solids; recommended by manufacturer for purpose and conditions under which used.

1. Products:

a. Adhesives Technology Corporation; Ultrabond 2100: www.atcepoxy.com.

b. SpecChem, LLC; SpecPoxy 3000: www.specchemllc.com.

c. W.R. Meadows, Inc.; Rezi-Weld 1000: www.wrmeadows.com.

PART 3 EXECUTION

3.01 EXAMINATION

A. Verify that surfaces are ready to receive work.

B. Beginning of installation means acceptance of substrate.

3.02 CLEANING EXISTING CONCRETE

A. Provide enclosures, barricades, and other temporary construction as required to protect adjacent work from damage. Refer to section 01 00 00 for more information.

B. Clean concrete surfaces of dirt or other contamination using the gentlest method that is effective.

1. Try the gentlest method first, then, if not clean enough, use a less gentle method taking care to watch for impending damage.

2. Clean out cracks and voids using same methods.

C. The following are acceptable cleaning methods, in order from gentlest to less gentle:

1. Water washing using low-pressure, maximum of 100 psi, and, if necessary, brushes with natural or synthetic bristles.

2. Increasing the water washing pressure to maximum of 400 psi.

3. Adding detergent to washing water; with final water rinse to remove residual detergent.

4. Steam-generated low-pressure hot-water washing.

D. Do not use any of the following cleaning methods, unless otherwise indicated:

1. Brushes with wire bristles, grinding with abrasives, solvents, hydrochloric or muriatic acid, sodium hydroxide, caustic soda, or lye.

2. Soap or detergent that is not non-ionic.

3. Alkaline cleaning agents.

4. Acidic cleaning agents.

5. Abrasive blasting.

http://www.atcepoxy.com/ http://www.wrmeadows.com/ http://www.atcepoxy.com/ http://www.specchemllc.com/ http://www.wrmeadows.com/ http://www.atcepoxy.com/ http://www.atcepoxy.com/ http://www.wrmeadows.com/

03 0100 MAINTENANCE OF CONCRETE Page 4 of 3

3.03 CONCRETE STRUCTURAL MEMBER REPAIR

A. See the drawings for specific areas to be repaired.

B. Remove broken and soft concrete at least 1/4 inch (6 mm) deep.

C. Mechanically cut away damaged portions of reinforcement.

D. Remove corrosion from steel and clean mechanically.

E. Blast clean remaining exposed reinforcement surfaces.

F. Repair by welding new bar reinforcement to existing reinforcement using sleeve splices.

1. Perform welding work in accordance with AWS D1.4.

2. Make welded sleeve splices to achieve strength to exceed strength of new reinforcement.

G. Cover exposed steel reinforcement with epoxy mortar.

H. Work epoxy mortar into broken surface and build up patch to match original.

I. Feather edges of repairs flush to sound surface and trowel surface to match surrounding area.

3.04 CONCRETE SURFACE REPAIR USING CEMENTITIOUS MATERIALS

A. Clean concrete surfaces, cracks, and joints of dirt, laitance, corrosion, and other contamination using method(s) specified above and allow to dry.

B. Apply coating of bonding agent to entire concrete surface to be repaired.

C. Fill voids with cementitious mortar flush with surface.

D. Apply repair mortar by steel trowel to a minimum thickness of 1/4 inch (6 mm) over entire surface, terminating at a vertical change in plane on all sides.

E. Trowel finish to match adjacent concrete surfaces.

END OF SECTION 03 0100