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04/10/2023 1
FERROCEMENT
04/10/2023 2
DEFINITION
Ferro cement is a form of reinforced concrete using closely spaced multiple layers of mesh and/or small diameter rods completely infiltrated with, or encapsulated in, mortar.
04/10/2023 3
Typical cross section of ferrocement
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Materials used in Ferro cement
Cement mortar mix
Skeleton steel
Steel mesh reinforcement or Fibre-
reinforced polymeric meshes
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Cement mortar mix
•OPC and fine aggregate matrix is used
•The matrix constitutes 95% of the
composite and governs its behavior
•sand occupies 60 to 75% of the volume
of the mortar
•Plasticizers and other admixtures are
used
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Chemical admixtures used in ferrocement serve
purposes of
• water reduction, with strength and reduces
permeability;
• Air entrainment, which increases resistance to
freezing and thawing;
• suppression of reaction between galvanized
reinforcement and cement
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Water
Water should be potable,
clean, and free from organic matter
- silt, oil, sugar, chloride and acidic
material
pH equal or greater than 7
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Mix Proportions
•Sand: cement ratio (by mass) 1.5
to 2.5
•Water: cement ratio (by mass)
0.35 to 0.60
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Skeleton steel
Forms the skeleton of the structure 3 to 8 mm steel rods are used Used in the form of tied reinforcement or
welded wire fabric Used to impart structural strength in case
of boats, barges etc Reinforcement should be free from dust,
rust and other impurities
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Steel mesh reinforcement
Consists of galvanized steel wires of diameter 0.5 to 1.5 mm, spaced at 6 to 20mm centre to centre
Available as woven/interlocking mesh and welded mesh
Welded wire mesh has hexagonal or rectangular openings
Expanded-metal lath is also used Made from carbon, glass etc.
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Commonly used reinforcing mesh
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Properties of ferro cement
It is a very durable, cheap and versatile material.
Low w/c ratio produces an impermeable structures
less shrinkage, and low weight.
high tensile strength and stiffness
better impact and punching shear resistance
undergo large deformations before cracking or
high deflections
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Behavior of ferrocement in tension
RC IN TENSION FERRO CEMENT IN TENSION
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Applications
TANKS, CONTAINERS AND SILOS
. FLOORS AND ROOFS
. HEAVY DUTY FLOORS TILES
. WATERPROOFING
. MANHOLE COVERS
. WALL CUPBOARDS
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• ANTICORROSIVE MEMBRANE TREATMENT
. FERROCEMENT BUILDINGS
. FERROCEMENT DUCTS
. REHABILITATION OF STRUCTURES
. CHEMICAL RESISTANT TREATMENT
. IRRIGATION STRUCTURES
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RURAL APPLICATIONS
MARINE APPLICATIONS
ELEVATION TREATMENT
FIRE RESISTANT STRUCTURES
SOIL STABILISATION
PIPES
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SEWER LINES
BRIDGE
FOOT BRIDGE
STRENGTHENING OF RCC STRUCTURES
SULPHATE RESISTANT CEMENT SAVING
PRE-CAST FERROCEMENT STRUCTURES
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Techniques of manufacture
Hand plastering
Semi- mechanised process
Centrifuging and
Guniting
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THANK YOU