Manufacture's
Qualifications
Comade maintains at all
times a quality control program as herein outlines so as
to insure that all precast meets all requirements as
specified under physical requirements. All precast shall
be manufactured by skilled workmen who have at least
five years experience in similar work and supervised by
foremen certified by the ACI (American Concrete
Institute).
Manufacturing
All precast work shall be true to
dimensions and have clean, accurate arrises and details
faithfully executed. Reinforcing steel shall conform to
ASTM 615 for rebar, and deformations shall conform to
ASTM-M-0305. All precast shall have a minimum
compressive strength of 5,000 psi at 28 days of age when
tested by means of 6 x 12 cylinder molds from the
materials. There shall be a maximum of 4-6% air
entrainment for all precast according to ASTM standards.
Reinforcement
All concrete products have reinforcement
characteristics such as rebar or fiberglass.
Molds
The forms for the precast units shall be
constructed of metal or fiberglass, and designed to
withstand casting pressures without distortion. All
anchors, inserts, bolts, etc., will be placed and
secured in the forms as required for the attachment and
handling of the units. These shall be clamped or secured
so as to hold them in position during fabrication.
Physical Characteristics
All exposed surfaces are treated to remove the
surface matrix and expose the aggregate produced by
chemical retardent - not sand blasting. All precast
shall have water-repellent sealer treatment applied in
strict accordance with manufacturer's specifications.
All tolerances shall be within 1/8" of specified
dimensions, designed for structural analysis and
calculation.
Color
Color to be uniform throughout as approved by
owner or specifier in accordance with manufacturer's
recommendation.
Materials
Portland Cement: ASTM C150 Type I or III
All aggregate to meet ASTM C33 Specifications
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