“Ferro cement is a type of thin wall reinforced concrete,
commonly constructed of hydraulic cement mortar, reinforced with
closely spaced layers of continuous and relatively small size wire mesh.
The mesh may be made of metallic or other suitable material.
• It is a strong, low-cost, long-lasting building material made from a wire
reinforced mixture of sand, water, and cement.
• Uses for Ferro-cement are walls, floors, and roofs, underground
structures, underground water tanks, water control devices, retaining
walls, stairways built over adobe blocks, etc..
• A ferro-cement structure is usually 2-5 cm (3/4"-1 3/4") thick--- much
thinner and lighter than poured concrete structures. Because it has wire
reinforcing distributed throughout the structure, ferrocement structures
have much greater tensile strength and flexibility than ordinary concrete.
•The term "ferrocement" was given to this product by its inventor in
France, Joseph Monier. At the time, (1850's) he wanted to create urns,
planters, and cisterns without the expense of kiln firing. In 1875 he
created the first steel and concrete bridge.
•The outer layer was sculpted in its wet state to mimic rustic logs,
thereby also introducing Faux Bois( false wood- wood or wood grains in
various media) concrete into practice.
•Recent trends have "ferrocement" being referred to as ferro concrete
or reinforced concrete to better describe the end product instead of its
components. By understanding that aggregates mixed with Portland
cement form concrete, but many things can be called cement, it is
hoped this may avoid the confusion of many compounds or techniques
that are not ferro concrete.
•Cement mortar mix.
•Steel mesh reinforcement or Fibre-reinforced polymeric meshes.
CEMENT MORTAR MIX
• Ordinary Portland cement is used for normal applications.
• Recommended cement quantity is 500 – 600 kg per cubic meter.
• Lower cement consumption will result into reduction in strength and
• Ordinary river sand free of any organic matter should be used.
• Sand should be strong, impermeable and capable of producing sufficiently
strong mix with as low water/cement ratio as possible.
• Allowable maximum grain size is 2.36mm.
• Fineness modulus should be between 2.5 – 3.0.
• Water is required for producing workable mix and hydration of cement.
• Used to improve workability and to reduce water/cement ratio.
• Air entraining agents should not be used.
•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
STEEL MESH REINFORCEMENT
•MS wires of 2 – 6mm dia. at 100 – 150 mm interval in a grid
• Wire meshes: Woven mesh(GI / MS of 1 – 1.5mm dia. at 10 –
20mm in a grid form)
Chicken mesh (GI hexagonal mesh of 10 – 20mm made of wire
of 0.5 – 1mm dia.).
•Welded wire mesh has hexagonal or rectangular openings.
•Expanded metal mesh (Diamond shaped openings of 20 –
25mm). Concrete does not dry; it becomes strong chemically,
in 28 moist days. If concrete dries before this period it will not
reach maximum strength.