REVIEWED BLD BLD2021-0244+Concrete_Info+2.11.2021_12.45.48_PM+2043789Strengthening of Cast -in -Place Concrete
Section 03 01 30.72
PART GENERAL
1.01 DESCRIPTION
A. This specification section shall define the minimum requirements of the
externally bonded composite strengthening system.
1.02 REFERENCES
A. General
1. The latest reference edition available shall be used for all standards.
B. American Concrete Institute (ACI)
1. ACI 440.2R, Guide for the Design and Construction of Externally
Bonded FRP Systems for Strengthening of Concrete Structures
2. ACI 562, Code Requirements for Evaluation, Repair and Rehabilitation
of Concrete Buildings
C. American Society for Testing and Materials (ASTM)
1. ASTM D3039, Standard Test Method for Tensile Properties of Polymer
Matrix Composite Materials
2. ASTM D4541, Standard Test Method for Pull -Off Strength for Coatings
Using Portable Adhesion Testers
3. ASTM D7522, Standard Test Method for Pull -Off Strength for FRP
Bonded to Concrete Substrate
4. ASTM D7565, Standard Test Method for Determining Tensile
Properties of Fiber Reinforced Polymer Matrix Composites Used for
Strengthening of Civil Structures
5. ASTM E84, Standard Test Method for Surface Burning Characteristics
of Building Materials
D. International Concrete Repair Institute (ICRI)
1. ICRI Technical Guideline No. 310.2R, Selecting and Specifying
Concrete Surface Preparation for Sealers, Coatings, and Polymer
Overlays
E. ICC Evaluation Service (ICC-ES)
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Strengthening of Cast -in -Place Concrete
Section 03 01 30.72
1. AC125, Acceptance Criteria for Concrete and Reinforced and
Unreinforced Masonry Strengthening using Externally Bonded Fiber -
Reinforced Polymer (FRP) Composite Systems
2. AC178, Acceptance Criteria for Inspection and Verification of Concrete
and Reinforced and Unreinforced Masonry Strengthening using Fiber -
Reinforced Polymer (FRP) Composite Systems
1.03 MEASUREMENT AND PAYMENT
A. The composite strengthening system shall be purchased by the City including
all costs associated with the work defined in this specification section. This
includes the furnishing of all submittals, materials, tools, equipment, labor,
surface preparation, transportation, storage, and supervision required for the
application of the FRP materials.
1.04 SUBMITTALS
A. Manufacturers' Product Data
1. Current ICC Evaluation Service Report for the proposed materials.
2. Technical data sheets for materials to be used.
3. Safety data sheets (SDS) for each material component.
4. Installation instructions, including temperature restrictions, moisture
limitations, surface preparation methods, curing times, and finish
requirements.
B. Calculations and Drawings
1. Drawings for the composite system are compliant with ACI 440.2R and
are stamped and signed by Civil or Structural Engineer registered in
the state that the project site resides in.
2. Design calculations have not been performed due to the nature of the
repair. The externally bonded composite strengthening system shall be
installed to provide additional support for deficient center joint repairs
and to seal off any moisture paths. Bond strength pull -off tests
conducted by the City determined that the existing center joint repairs
were not bonded to the soffit interface. The existing repairs are
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Section 03 01 30.72
currently held in place by a perimeter bond and welded wire mesh
integral to the entire deck support structure.
3. Drawings detail the necessary surface preparation, composite system
to be used, number of layers, locations, end details, primary fiber
direction, and finish requirements.
C. Applicator Qualification
1. The composite system manufacturer shall provide written
documentation that the City staff has completed the manufacturer's
training program and has been trained to install the proposed system.
1.05 PRODUCT DELIVERY, STORAGE, AND HANDLING
A. All products shall be delivered, stored, and handled according to the
manufacturer's recommendations.
B. Materials shall be clearly labeled and delivered in factory -sealed containers
with manufacturing dates and shelf lives easily identifiable.
C. Materials shall be stored in a protected area free of moisture and UV
exposure, with temperatures between 450F and 95°F.
PART 2 PRODUCTS
2.01 COMPOSITE STRENGTHENING SYSTEM
A. The FRP strengthening system has been preapproved and shall be a
Composite Strengthening System TM supplied by Simpson Strong -Tie®, Inc.,
5956 W. Las Positas Boulevard, Pleasanton, CA 94588, Phone:
925.560.9000, Fax: 925.847.1605.
1. Fabric
a. CSS-CUCF22: Code listed, unidirectional carbon fabric.
2. Epoxy Adhesive
a. CSS-ES: Epoxy saturant and primer.
b. CSS-EP: Epoxy paste and filler.
3. Filler
a. CSS-EP: Epoxy paste and filler.
b. CSS-ES thickened with fumed silica: Epoxy paste and filler.
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PART 3 EXECUTION OF WORK
3.01 SURFACE PREPARATION
A. Surfaces to be wrapped shall be clean, sound, and free of standing water at
time of application. All dust, laitance, grease, curing compounds, and other
foreign materials that may hinder the bond must be removed before
installation.
B. Existing concave and convex surfaces must be filled/transitioned with epoxy
paste or a suitable repair mortar.
C. The concrete shall be abrasively prepared to achieve an ICRI CSP 3 profile
by means of grinding, sand blasting, shot blasting, or pressure washing.
3.02 SURFACE MOUNTED APPLICATION
A. Verify ambient and concrete surface temperatures are between 45°F and
95°F.
B. Apply one coat of epoxy primer using a nap roller when using fabrics.
C. Apply epoxy paste where minor surface defects are present.
D. Allow the primer and/or paste to become tacky to the touch before applying
the saturated fabric.
E. When manually saturating fabric, precut sheets to required length using
heavy duty shears before saturating with hand rollers. If mechanically
saturating fabric with rollers, cut sheets using heavy duty shears either before
or after they go through the epoxy bath. In both cases, ensure full fabric
saturation is achieved.
F. Apply the saturated sheet to the installation surface and remove entrapped air
using hand pressure, rollers, or trowels.
G. Feather all fabric seams/edges with epoxy paste.
H. Confirm that intimate contact between composite system and substrate will be
maintained throughout the curing process.
3.03 QUALITY CONTROL
A. Field Monitoring
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1. The work performed in Section 3.01 and Section 3.02 of this
specification will be field monitored by the Owner and the design
consultant. The surface preparation shall be checked immediately
before application of the composite system materials. Periodic
inspection shall be provided during the application process.
2. The inspector shall create daily reports that document the following:
a. Date and time of installation.
b. Ambient temperature, relative humidity, and weather conditions.
C. Substrate surface temperature and dryness.
d. Surface preparation method and ICRI concrete surface profile.
e. Surface cleanliness description.
f. Fabric batch numbers.
g. Epoxy batch numbers, mix ratios, and mixing times.
h. Application locations.
i. Conformance with installation procedures.
j. Location and size of any delaminations/voids identified or
repaired.
B. Defects
1. Small delaminations less than 2 square inches are acceptable so long
as the delaminated area is less than 5% of the total laminate area and
there are no more than 10 such delaminations per 10 square feet.
2. Large delaminations greater than 25 square inches shall be locally cut
away and a new material shall be applied with an equivalent number of
layers and sufficient development length overlaps.
3. Delaminations between 2 square inches and 25 square inches shall be
injected with epoxy or replaced, depending on the size, number of
delaminations, and locations.
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