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Presenting a seminar on
Civil 6th sem
Dhruvil .y. patel
“ Ferro cement is a
composite material which is used
in building or sclupture with
cement, sand, water and wire mesh
material often called a thin shell “
MATERIAL OF FERRO
WIRE MESH & CEMENT MORTAR
Ferro cement is a relatively
new material consisting of
wire meshes and cement
In figure many types of wire
mesh are shown…….
The wire mesh is usually of
0.5 to 1.0 mm dia wire at 5
mm to 10 mm spacing and
Cement mortar is of cement sand ratio of 1:2
or 1:3 with water/cement ratio of 0.4 to 0.45.
The ferrocement elements are usually of the
order of 2 to 3 cm in thickness with 2 to 3 mm
external cover to the reinforcement
The steel content varies between 300 kg to
500 kg per cubic meter of mortar.
The basic idea behind this material is
that concrete can undergo large strains
in the neighbourhood of the
reinforcement and the magnitude of
strains depends on the distribution and
subdivision of reinforcement throughout
of the mass of concrete.
ADVANTAGES OF FERRO
The main advantages of ferrocement are as
given below :
i. Simplicity of its construction,
ii. Lesser dead weight of the elements due to
their small thickness,
iii. Its high tensile strength,
iv. Less crack widths compared to conventional
v. Easy repairability, noncorrosive nature and
easier mouldability to any required shape
Thickness – 10mm to 60mm
Steel – 5 to 8%
Steel cover – 1.5mm to 5mm.
Ultimate tensile strength – 34.5 N/mm²
Allowable tensile strength – 10 N/mm²
Compresive strength – 27.5 to 60 N/mm²
used for casting
water tanks .
It is been used for
building boat .
Ferro cement boat
is 14 meter long.
Which is 300%
It is also been
used for creating
man hole cover.
Ferro cement is
also been used for
It is also been
used for casting
benches , chairs
DEVELOPMENT OF FERRO
This is a highly suitable material for precast
products, because of its easy adaptability to
prefabrication lesser dead weight of its units
The development of ferrocement depends on
suitable casting techniques for the required
There are four methods of casting are as given
a. Hand plastering
b. Semi-mechanised process
c. Centrifuging and
In this method the control of thickness is
difficult and the minimum thickness of section
that can be cast works out to about 2cms.
The strength obtaind by this system will be
lower compared to other methods .
However the units can be cast by this process
and used in siuations where for other improved
methods do not exist.
These units can be used for pipes , storage
structures and gasholder units.
This system is termed as semi-mechanised
because the mould can be rotated to facilitate
dashing of mortar.
This system is better than the earlier system as
better compaction .
The uniformity of this system is also better than
the earlier system.
The advantages of this system are that it does
not require any sophisticated equipment or
The centrifuging process is commonly adopted
for the fabrication of concrete cylindrical units.
Because of good compaction , the ferrocement
pipe cast by centrifuging can be used as
The process of guniting can be adopted for
applying the mortar to the wire mesh system.
This process applied with experinced gunman
can give good compact and uniform surface.
This appears to be suitable process for mass
production of ferrocement prefabricated units.