2.15
SYNTHETIC FIBERS FOR REINFORCING
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NOTE: Use fiber reinforcement only when approved by
the designer; in that case retain this paragraph.
Drawings should indicate where fiber reinforced
concrete is located. Fiber reinforcing is used to
help control cracking due to drying shrinkage and
thermal expansion/contraction; reduce permeability;
and increase impact capacity, shatter and abrasion
resistance, and toughness. Fiber reinforcing will
not: control cracking due to structural stresses,
significantly increase strength, control curling or
creeping, justify reducing structural members,
eliminate control joints, or replace any moment or
structural steel reinforcement. Include flexural
toughness tests when synthetic reinforcement fibers
are used to increase toughness and when justified by
size and importance of the job, but not when fibers
are used only to control shrinkage cracking.
Include technical representative requirement when
warranted by size and importance of the job.
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Synthetic fibers shall conform to ASTM C 1116, Type III, Synthetic Fiber,
and as follows. Fibers shall be 100 percent virgin polypropylene
fibrillated fibers containing no reprocessed olefin materials. Fibers
shall have a specific gravity of 0.9, a minimum tensile strength of 480 MPa
70 ksi graded per manufacturer, and specifically manufactured to an optimum
gradation for use as concrete secondary reinforcement.
2.16
DRY SHAKE FLOOR TOPPING MATERIAL
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NOTE: Edit and supplement this paragraph for light
reflective, spark resistant, static disseminating
floors as applicable to the project.
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Dry shake floor topping material shall be a premixed ready-to-use dry
shake. It shall be proportioned, mixed and packaged at the factory, and
delivered to the jobsite in sealed, moisture resistant bags, ready to
apply, finish and cure. The manufacturer of the dry shake material shall
have at least 10 years experience in the manufacture of such material. Any
material from a manufacturer who makes any disclaimer of the materials
performance shall not be used.
PART 3
EXECUTION
3.1
PREPARATION FOR PLACING
Before commencing concrete placement, the following shall be performed.
Surfaces to receive concrete shall be clean and free from frost, ice, mud,
and water. Forms shall be in place, cleaned, coated, and adequately
supported, in accordance with Section 03100A STRUCTURAL CONCRETE FORMWORK.
Reinforcing steel shall be in place, cleaned, tied, and adequately
supported, in accordance with Section 03200A CONCRETE REINFORCEMENT.
Transporting and conveying equipment shall be in-place, ready for use,
clean, and free of hardened concrete and foreign material. Equipment for
SECTION 03300A
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