General Construction Specifications
SECTION 03732
CONCRETE REPAIR
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Preparation of concrete and application of repair materials.
B. [Rehabilitation] [Restoration] of concrete surfaces.
C. Repair of concrete internal reinforcement.
1.2 RELATED SECTIONS
A. Section 03300 - Cast-In-Place Concrete.
B. Section 04500 - Masonry Restoration and Cleaning.
C. Section [______-____________]: Applied finish to [repaired] concrete surface.
1.3 UNIT PRICE - MEASUREMENT AND PAYMENT
A. Repair Surface: By the square [foot] [________] ([meter] [________]). Includes surface preparation, repair, finishing.
1.4 REFERENCES
A. ASTM A82 - Cold Drawn Steel Wire for Concrete Reinforcement.
B. ASTM A615/A615M - Deformed and Plain Billet-Steel Bars for Concrete Reinforcement.
C. ASTM A616/A616M - Rail-Steel Deformed and Plain Bars for Concrete Reinforcement.
D. ASTM A617/A617M - Axle-Steel Deformed and Plain Bars for Concrete Reinforcement.
E. ASTM C33 - Specifications for Concrete Aggregates.
F. ASTM C150 - Portland Cement.
G. ASTM C404 - Aggregates for Masonry Grouts.
H. ASTM C882 - Bond Strength of Epoxy Resin Systems Used with Concrete.
I. ASTM D638 - Test Method for Tensile Properties of Plastics.
J. ASTM D695 - Compressive Properties of Rigid Plastics.
K. ASTM D790 - Flexural Properties of Plastics and Electrical Insulating Materials.
L. AWS D1.4 - Structural Welding Code for Reinforcing Steel.
1.5 SUBMITTALS FOR REVIEW
A. Section 01300 - Submittals: Procedures for submittals.
B. Product Data: Indicate product standards, physical and chemical characteristics, technical specifications, limitations, maintenance instructions, and general recommendations regarding each material.
1.6 SUBMITTALS FOR INFORMATION
A. Section 01300 - Submittals: Procedures for submittals.
B. Manufacturer's Certificate: Certify that specified [products] [________] meet or exceed [specified requirements] [________].
1.7 SUBMITTALS AT PROJECT CLOSEOUT
A. Section [01700 - Contract Closeout:] [01730 - Operation and Maintenance Data:] [01740 - Warranties and Bonds:] Procedures for submittals.
B. Accurately record actual locations of structural reinforcement repairs, type of repair, and [________].
1.8 QUALITY ASSURANCE
A. Perform welding work in accordance with AWS D1.4.
B. Materials Manufacturer: Company specializing in manufacturing the products specified in this Section with minimum [three] [_______] years [documented] experience.
C. [Design reinforcement splices under direct supervision of a Professional Structural Engineer experienced in design of this Work and licensed [at the place where the Project is located.] [in the State of [________].]
D. Applicator: Company specializing in concrete repair [with minimum [__________] years [documented] experience] [approved by manufacturer].
****** [OR] ******
D. Applicators:
1. [____________________________________].
2. [____________________________________].
3. [____________________________________].
1.9 MOCK-UP
A. Section 01400 - Quality Control: Requirements for mock-up.
B. Provide panel [_____] feet ([____] m) long by [______] feet ([____] m) wide, illustrating patching method, color and texture of repair surface and [________].
C. Prepare [one] [____] sample of each type of injection and patching procedure.
D. Locate [where directed.] [________.]
E. Mock-up may [not] remain as part of the Work.
1.10 DELIVERY, STORAGE, AND PROTECTION
A. Section 01600 - Material and Equipment: Transport, handle, store, and protect products.
B. Comply with instructions for storage, shelf life limitations, and handling.
PART 2 PRODUCTS
2.1 MANUFACTURERS
A. Manufacturers:
1. [_________________________________] Model [________].
2. [_________________________________] Model [________].
3. [_________________________________] Model [________].
4. Substitutions: [Refer to Section [01600.] [________.]] [Not permitted.]
2.2 PATCHING MATERIALS
A. Epoxy Resin: Two-part epoxy adhesive containing [100] [____] percent solids, meeting the following minimum characteristics:
Characteristic Test Method Results
1. Bond Strength ASTM C882 [2,700] [____] psi
([18.6] [____] MPa)
2. Tensile Strength ASTM D638 [6,600] [____] psi
([45] [____] MPa)
3. Elongation ASTM D638 [2] [____] percent
at 7 days at 70 degrees F
(21 degrees C)
4. Flexural Strength ASTM D790 [8,000] [____] psi
([45] [____] Mpa)
5. Compressive Strength ASTM D695 [6,500] [____] psi
([55] [____] MPa)
B. Bonding Agent: [Polyvinyl acetate] [________] emulsion, dispersed in water while mixing, non-coagulant in mix, water resistant when cured.
C. Portland Cement: ASTM C150, Type [____], [grey] [white] color [as selected].
D. Sand: ASTM [C33] [C404]; uniformly graded, clean.
E. Water: Clean and potable.
F. Cleaning Agent: Commercial muriatic acid [of [____] percent strength].
2.3 REINFORCEMENT MATERIALS
A. Reinforcing Steel: ASTM A615/A615M, [40] [60] [75] ksi ([276] [414] [517] mPa) yield grade billet-steel [plain] [deformed] bars, [unfinished] [galvanized] finish.
****** [OR] ******
A. Reinforcing Steel: ASTM A617/A617M, [40] [60] ksi ([276] [414] mPa) yield grade axle-steel [plain] [deformed] bars, [unfinished] [galvanized] finish.
****** [OR] ******
A. Reinforcing Steel: ASTM A616/A616M, [50] [60] ksi ([345] [414] mPa) yield grade rail-steel [plain] [deformed] bars, [unfinished] [galvanized] finish.
B. Stirrup Steel: [ASTM A82] [________].
C. Splicing Sleeves: [________] type, [________] manufactured by [____________].
2.4 MIXING EPOXY MORTARS
A. Mix epoxy mortars in accordance with manufacturer's instructions for purpose intended.
B. Mix components in clean or containers. Conform to pot life and workability limits.
****** [OR] ******
2.4 MIXING CEMENTITIOUS MATERIALS
A. Mix cementitious [mortar] [grout] in accordance with manufacturer's instructions for purpose intended.
B. [Include] [Exclude] bonding agent as additive to mix.
PART 3 EXECUTION
3.1 EXAMINATION
A. Verify that surfaces are ready to receive work.
B. Beginning of installation means acceptance of [existing surfaces.] [substrate.]
3.2 PREPARATION
A. Clean concrete surfaces of dirt, laitance, corrosion, or other contamination; wire brush using [water] [acid]; rinse surface and allow to dry.
B. Flush out cracks and voids with [chemical solvent] [muriatic acid] [water] to remove laitance and dirt. [Chemically neutralize by rinsing with water.]
C. Provide temporary entry ports spaced to accomplish movement of fluids between ports; no deeper than the depth of the crack to be filled or port size diameter no greater than the thickness of the crack. Provide temporary seal at concrete surface to prevent leakage of adhesive.
D. For areas patched with epoxy mortar, remove broken and soft concrete [1/4] [____] inch ([6] [____] mm) deep. Remove corrosion from steel. Clean surfaces mechanically; wash with [acid] [________]; rinse with water.
E. [Sandblast] [________] clean the exposed reinforcement steel surfaces. Mechanically cut away damaged portions of bar.
3.3 REPAIR WORK
A. Repair exposed structural, shrinkage, and settlement cracks of concrete [as indicated on Drawings] by the [epoxy injection] [bonding agent and cementitious paste] method.
B. [Repair spalling.] [Fill voids flush with surface.] [Apply surface finish.]
C. Repair reinforcement by welding [new bar reinforcement to existing reinforcement] [________] with [sleeve splices] [________]. Strength of welded [splices] [and] [reinforcement] to exceed original stress values.
3.4 INJECTION - EPOXY RESIN ADHESIVE
A. Inject adhesive into prepared ports under pressure using appropriate for particular application.
B. Begin injection at lower entry port and continue until adhesive appears in adjacent entry port. Continue from port to port until entire crack is filled.
C. Remove temporary seal and excess adhesive.
D. Clean surfaces adjacent to repair and blend finish.
3.5 APPLICATION - EPOXY MORTAR
A. Trowel apply mortar mix to an average thickness of [____] inches ([____] mm). Tamp into place filling voids at spalled areas.
B. For patching honeycomb, trowel mortar onto surface, work mortar into honeycomb to bring surface flush with surrounding area. Finish trowel surface to match surrounding area.
C. Cover exposed steel reinforcement with epoxy mortar, feather edges to flush surface.
3.6 APPLICATION - CEMENTITIOUS [MORTAR] [GROUT]
A. Apply [spray] [brush] [roller] coating of bonding agent to [dry] [damp] concrete surfaces. Provide full surface coverage.
B. Apply cementitious [mortar] [grout] by steel trowel to an average thickness of [____] inches ([____] mm). Tamp into place filling voids at spalled areas. Work mix into honeycomb.
C. Damp cure cementitious [mortar] [grout] for [four] [____] days.
3.7 FIELD QUALITY CONTROL
A. Section 01400 - Quality Control: Field [inspection] [and] [testing].
B. Test concrete for [calcium chloride] [________] content during the execution of the Work.
3.8 SCHEDULE
A. North End of Existing Retaining Wall: Epoxy mortar with smooth trowel finish.
B. Cracked East Basement Wall: Epoxy resin injection, roughened surface finish to match adjacent work.
END OF SECTION
