7»—Laficistar' Farming. Saturday, March 6,1976
Researchers say rice
can be used in cement
UNIVERSITY PARK
Researchers at The Penn*
sylvanla State University
are investigating a way rice
can be used in the making of
cement. It’s a study that
could have major im
plications for un
derdeveloped countries, as
well as for the rice industry.
Paul R. Groney, of West
Springfield, Pa., a graduate
student in civil engineering,
and his research director.
Dr. Philip D. Cady, professor
of civil engineering, have
found that silica along
with lime, a major
ingredient in one type of
cement can be obtained
from burning rice bulls.
The researchers have
discovered that ash obtained
from burning hulls con
stitutes 15 to 20 percent of the
hulls’ weight; 95 percent of
this ash is silica. They think
that the use of the silica from
rice for cement making can
help to solve a costly,
disposal problem for the rice
industry, in addition to
providing a “cottage-level”
industry for many un
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derdeveloped nations.
The disposal of rice hulls,
say Dr. Cady and Groney,
now poses a problem for the
rice industry ash from the
burned hulls cannot be put
'into land fills because it
makes soil conditions un
stable.
“In the United States
alone,” Dr. Cady advises,
“there annually are, based
on the latest figures
available, over 800,000 tons
of rice hulls which contain
approximately 118,000 tons
of silica. Using two parts of
lime to one part of silica, this
would make about 354,000
tons of cement
“We roughly estimate that
companies are paying about
$3.50 per ton for disposal of
the rice hulls. So, we’re
talking about nearly three
million dollars per year just
for disposal.”
While the “f ice-hull
cement” is not as strong as
the more common Portland
cement it would be ex
tremely beneficial to poor,
underdeveloped countries
where rice is bountiful for
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use in single-family
dwellings and building
foundations, say the
researchers. Too. it is more
durable than Portland
cement in areas which
contain sulfates, such as
locations near sea and
ground water, because
sulfates attack the
aluminous component of
Portland cement.
Dr. Cady adds that the new
cement could be used in the
building and construction
industries in the United
States when mass, not
strength, is required.
Dr. Cady, a member of
VITA (Volunteers iif
Technical Assistance),
became involved in the rice
hull project when he was
asked ~by the technical
director of VITA to develop a
method for the small-scale
manufacture of lime and
cement in underdeveloped
countries.
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Announcement was made
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3. Have completed her
junior year of high school
and will not reach her 22nd
birthday by December 31,
1976.
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5. Must have parents’ or
guardians’ consent.
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