The document discusses ferrocement, which is a type of reinforced concrete using closely spaced layers of mesh or small rods encapsulated in mortar. Ferrocement consists of a cement mortar mix reinforced with steel mesh or fiber-reinforced polymer meshes and steel rods. It has several advantages over reinforced concrete including high strength, stiffness, impact resistance, and ability to withstand large deformations. Ferrocement can be used for applications such as tanks, floors, waterproofing, manhole covers, buildings, pipes, bridges, and strengthening existing concrete structures. It is applied using hand plastering, semi-mechanized processes, centrifuging, or guniting.
2. 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.
11/25/2013
2
5.
•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
11/25/2013
5
6.
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
11/25/2013
6
7.
Water should be potable,
clean, and free from organic matter silt, oil, sugar, chloride and acidic
material
pH equal or greater than 7
11/25/2013
7
8.
•Sand: cement ratio (by mass) 1.5 to 2.5
•Water: cement ratio (by mass) 0.35 to
0.60
11/25/2013
8
9.
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
11/25/2013
9
10.
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.
11/25/2013
10
12.
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
11/25/2013
12
