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Raw
Material
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nCem-FIL
AR Glass Fibre
Cem-FIL AR Glass Fibre
is a continuous
filament, alkali
resistant glass fibre
with high durability
in cement. The fibre
composition lies
within a critical
region of the Na2O CaO
ZrO2 SiO2 system. Some
typical properties of
Cem-FIL AR Fibre are
as follows:
-
nSingle
filament tensile
strength 3.5 GN/m2
3.5 GN/m2
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nStrand
tensile strength 1.7
GN/m2 1.7 GN/m2
-
nYoung’s
Modulus of
Elasticity 72 GN/m2
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nSpecific
Gravity 2.68
-
nStrain
at breaking point
(strand) 2.4%
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nFilament
diameter 14 or 20 µm
There are two
product forms used
in cement
reinforcement.
These are Chopped
Strands, for use
in premix GR C and
as a reinforcement
in renders and
concretes, and
Rovings, for use
in the spray
production of GRC
or for continuous
reinforcement.
Chopped Strands
consist of
continuous strands
chopped to uniform
length while
maintaining the
integrity of the
original strand.
They are available
in lengths of 3mm
to 35mm. Chopped
Strands are
normally
designated by
length, by the Tex
(mass in grams of
a kilometer
length) of the
individual strands
(bundle of
filaments) and by
reference to their
size coating. The
size coating on
Chopped Strand
products is
designed to give
resistance to
mechanical damage
in processing or
designed to allow
the strands to
disperse into
individual
filaments on
contact with
moisture. Chopped
Strands are
supplied packed
either in boxes or
bags, or in bulk
shipments. A
Roving is a
grouping of
individual
parallel strands
wound as a bundle
into a cylindrical
shaped package
containing
typically 20 kg of
fibre. A Roving is
a grouping of
individual
parallel strands
wound as a
bundle into a
cylindrical shaped
package containing
typically 20 kg of
fibre. It may be:
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nChopped
in a ‘gun’ and
sprayed
simultaneously
with the cement
matrix material
to provide
composites which
may be of
complex profile.
-
nChopped
on-site to
reduce transport
costs, and
allowing direct
feeding into
premix processes
nRovings
are designated
by the Tex of
the whole
Roving, the Tex
of the Strand
and the number
of strands they
contain and by
reference to
their size
coating.
-
nRovings
are normally
shrink-wrapped
in plastic film
and packed in
cardboard
cartons.
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