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F
Fly Ash
A fine, glass-powder recovered
from the gases of burning coal during the
production of electricity. These micron-
sized earth elements consist primarily of
silica, alumina and iron. When mixed with
lime and water the fly ash forms a cementitious
compound with properties very similar to
that of portland cement. Because of this
similarity, fly ash can be used to replace
a portion of cement in the concrete, providing
some distinct quality advantages. The concrete
is denser resulting in a tighter, smoother
surface with less bleeding. Fly Ash concrete
offers a distinct architectural benefit
with improved textural consistency and sharper
detail.
Fly ash with a low LOI (carbon content)
is used as a substitute for portland cement
in concrete. Regulations vary from state
to state, however, ASTM suggests that fly
ash must not contain more than 6% unburned
carbon to be used for its cementitious qualities.
Otherwise, concrete companies use it as
a fine aggregate in concrete block. Others
use it for filling old coal mines, seaside
docking areas and as a lining for hazardous
waste dumps.
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Fossil Fuel
A fuel, such as coal, crude
oil and natural gas, produced by the decomposition
of ancient (fossilized) plants and animals;
compare to "Alternative
Energy."
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Fungicide
Pesticides that are used to
control, deter or destroy fungi.
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Fungus (Fungi):
Molds, mildews, yeasts, mushrooms
and puffballs; a group of organisms that
are lacking in chlorophyll and usually non-mobile,
filamentous and multicellular. Some grow
in soil; others attach themselves to decaying
trees and other plants to obtain nutrients.
Some are pathogens; others stabilize sewage
and digest composted waste.
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