Ferro-Cement Properties and Uses In Construction

Ferro-Cement Properties and Uses In Construction

Its combination  of  ferrous  product  with  cement.In the form of steel wires meshes with portland cement mortar. Wire mesh is usually of 0.8 to 1.00 m diameter steel wires at 5 mm to 50 mm spacing and the cement mortar is of cement sand ratio of 1:2 or 1:3. 6 mm diameter bars are also used at large spacing, preferably in the corners. Sand may be replaced by baby jelly. The water cement ratio used is between 0.4 to 0.45. Ferro-cement reinforcement is assembled into its final desired shape and plastered directly. There is no need for form work. Minimum two layers of reinforcing steel meshes are required. According to American  Concrete  Institute  “Ferro  cement  is  a  thin  walled  reinforced  concrete  construction  where usually a hydraulic cement is reinforced with layers of continuous and relatively small diameter mesh.The mesh used may be metallic or any other suitable material.”

Ferro-cement is fast emerging as an alternate material for timber. The history of ferro-cement goes back to 1843 (even before RCC). Joseph Louis Lambet constructed several rowing boats, plant plots  and  garden  seats  using  ferro-cement.  In  early  1940’s  noted  Italian  engineer  and  architect  Pier Luigi Nervi carried out scientific tests on ferro-cement and used it to replace wood wherever possible.He  built  small  tonnage  vessels,  the  largest  being  165  tons  motor  sailor.  Nervi  also  pioneered  the architectural use of ferro-cement in buildings. Ferro-cement can be given the finish of teak wood, rose wood etc. and even for making tables, chairs and benches it can be used.

Properties of Ferro-cement

1. Its strength per unit mass is high.
2. It has the capacity to resist shock laod.
3. It can be given attractive finish like that of teak and rose wood.
4. Ferro cement elements can be constructed without using form work.
5. It is impervious.

Uses of Ferro-cement

It can be used for making:

1. Partition walls
2. Window frames, chejjas and drops
3. Shelf of cupboards
4. Door and window shutters
5. Domestic water tanks
6. Precast roof elements
7. Reapers and raffers required for supporting roof tiles.
8. Pipes
9. Silos
10. Furnitures
11. Manhole covers
12. Boats.