GFRC Material Specifications

GFRC Material Specifications

Cement
Type I, white Portland Cement of one type, brand, source, and lot throughout
entire project, and meeting requirements of ASTM C150 “Specification for
Portland Cement.”
Fine Aggregate
Fine, clean, dry sand, able to pass a No.16 (Max 2% passing No 100) sieve, free
of contaminants or deleterious matter, of one source throughout the project, and
meeting composition requirements of ASTM C144 “Specification for Aggregate
for Masonry Mortar.”
Water
Fresh, clean, potable and free of any deleterious matter.that may affect color
stability, setting, staining or strength of GFRC backing or face mix.
Glass Fibers
High zirconium content (minimum 16%) alkali resistant glass fibers specifically
designed for use in concrete; with density of 2.7 g/crn3 and length of 1-1/2″ to 2″,
and complying with PCI MNL 130-07 Second Edition.
Concrete Pigment
Harmless to concrete strength and set, stable at high temperatures, sunlight fast,
alkali-resistant, not to exceed 10% of amount of cement, and conforming to the
requirements of ASTM C979 “Specification for Pigments for Integrally Colored
Concrete.”
Coarse Aggregate
Clean, hard, strong, durable and inert, free of deleterious or staining material.
Conforming to the requirements of ASTM C33 “Specification for Concrete
Aggregates,” except for gradation.
Water Reducing Admixture
Conforming to the requirements of ASTM C494 “Specification for Chemical
Admixtures for Concrete”, and containing not more than 0.1 percent chloride
ions.
Polymer Curing Admixture
Acrylic Thermoplastic copolymer conforming to the curing compound
specifications in Division 3 of the second edition of the Precast-Prestressed
Concrete Institute’s “Manual for Quality Control for Plants and Production of
GFRC Products”.
Flex Anchors
Steel anchors shall conform to the requirements of ASTM A29 or A108, Ductile
materials shall be used. Corrosion Protection for flex anchors shall confom to the
requirements of ASTM B633 for electro-deposited zinc.
Steel Framing
Galvanized studs and track formed from steel conforming to ASTM A446 with a
minimum G-60 galvanized coating. Studs will have a minimum yield strength of
40 ksi, and tracks will have a minimum yield of 30 ksi. Light gage steel materials
shall be either painted or galvanized to inhibit corrosion.
Tube Steel Sections
Formed from steel that conforms to the requirements of ASTM A500 Grade B, or
ASTM A513, “Specifications for Cold-Formed Welded and Seamless Carbon
Steel Structural Tubing in Rounds and Shapes,” and having a minimum yield
strength of 46 ksi.

About Corey Turcotte

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