=12, but Glass is 8.5.
GFRC Glass Fiber Reinforced Concrete is usually for thin shelled wall
panels and there is plenty of literature for it. Usually it is a chopped
fiber mixed into concrete but also comes in long strans or cloth. This
may require that the GFRC be an independent layer over the steel
reinfoced concrete to avoid de-lamination, causing unpredictable
cracking and movement and failure. Building exterior panels are always
separate from the main structure. GFRC is also used for fire place
hearths but again it is a separate added shell anchored to the masonry
with flexible connections to allow movement.
Differential movement results primarily from extensive GFRC shrinkage
and creep, and thermal expansion/contraction of the panels relative to
the concrete frame.
http://rebar.ecn.purdue.edu/ect/links/technologies/civil/mms6.aspx
http://en.wikipedia.org/wiki/Glass_fiber_reinforced_concrete
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