Module IV BUILDING MATERIALS
Transcript of Module IV BUILDING MATERIALS
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MODULE IV
BUILDING MATERIALS
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BRICKS2
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CONSTITUENTS OF BRICK EARTH
Alumina
Silica
Lime
Oxides of iron
Magnesia
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MANUFACTURE OF BRICKS
Preparation of brick clay
Moulding of bricks
Drying of bricks
Burning of bricks
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CLASSIFICATION OF BRICKS
Unburnt or sundried bricks
Burnt bricks
First class bricks
Second class bricks
Third class bricks
Fourth class bricks
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PROPERTIES OF BRICKS
1) Uniform copper colour
2) Free from cracks, voids and grits
3) Even surfaces with sharp and square edges
4) It should be of standard size
5) Bricks when broken show homogeneous
structure
6) Bricks should be sufficiently hard
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7) Soundness
8) Water absorption
9) Should not break when dropped flat on hard
ground from 1m height
10) Crushing strength
11) Sound proof and low thermal conductivity
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PROPERTIES OF BRICKS
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CEMENT8
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ORDINARY PORTLAND CEMENT (OPC)
Siliceous materials
Argillaceous materials
Calcareous materials
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INGREDIENTS OF ORDINARY PORTLAND CEMENT
Lime (60 – 67 %)
Silica (17 – 25%)
Alumina (3 – 8%)
Calcium sulphate
Iron oxide (0.5 – 6%)
Magnesia (0.1-4%)
Sulphur (1 – 2.5%)
Alkalies (0.5%)
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Ingredients Functions If excess
Lime Imparts strength Makes cement unsound –
expand and disintegrate while
setting
Silica Imparts strength Increases strength of cement, but
at the same time setting time is
prolonged
Alumina Acts a flux, lowering
clinkering temperature
Weakens strength of cement
Calcium
sulphate
Retarding setting time
of cement
Iron oxide Imparts gray colour
Magnesia Imparts hardness and
colour
Makes cement unsound
Sulphur Making cement sound Makes cement unsound
Alkalies Efflorescence, staining
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PROPERTIES OF CEMENT (OPC)
Uniform color
Free from lumps
Should be cool when felt with hand
Should sink
Compressive strength
Tensile strength
Initial and final setting time
Fineness of cement
Heat of hydration should not be more than 75cal/gm after 28 days. 12
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SPECIFICATIONS OF ORDINARY PORTLAND CEMENT
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Fineness 2250 kg/cm2
Setting time
Initial
Final
Not less than 30min
Not more than 600 min
Compressive strength
3 days
7 days
11.5 N/mm2
25 N/mm2
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Grade of
cement
Details
33 grade • For general construction works in normal environmental
conditions
• Can not be used where higher grade of concrete above
M20 is required
43 grade • Widely used for general construction purposes – suitable
for applications RCC, plastering and masonry
•For construction of residential, commercial and industrial
buildings, roads, bridges, fly overs, irrigation projects etc
53 grade • For high rise buildings, bridges, flyovers, chimneys,
prestressed structures
•Used for making higher grade of concrete, above M3014
GRADES OF CEMENT
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PORTLAND POZZOLANA CEMENT
Made by inter grinding portland cement clinkar and pozzolana or uniform blending of portland cement and fine pozzolana.
Pozzolana – natural material like volcanic ash or fly ash
Properties:
Higher resistance to chemical agencies
Lower heat of evolution
More resistance to the attack of sea water
It gives better workability during preparation of concrete
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This cement is recommended for
Marine structures
Sewer and sewerage disposal works
Hydraulic structures like dams, reservoirs, canals
For mass structures like bridge piers and thick
foundations
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PORTLAND POZZOLANA CEMENT
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TYPES OF CEMENT
Ordinary Portland cement
Rapid hardening cement
Low heat cement
Quick setting cement
High alumina cement
Coloured cement
Expanding cement
Hydrophobic cement
Air entraining cement
White cement 17
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CEMENT MORTAR18
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CEMENT MORTAR
Mortar may defined as workable paste formed by
mixture of cementing materials, fine aggregate
(sand) and water.
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CLASSIFICATION OF MORTAR
MORTARKIND OF BINDING
MATERIAL
LIME MORTAR
MUD MORTAR
CEMENT MORTAR
GAUGED MORTAR
GYPSUM MORTAR
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PROPERTIES OF MORTAR
Workability
Good adhesion and bonding efficiency
Compressive strength
Durability
Reaction with other materials
Resists the water penetration
Strong and capable of resisting cracks
It should be cost effective
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USES OF CEMENT MORTAR
Binding masonry units
Manufacturing of hollow cement blocks
Pointing of masonry joints
Plastering
Finishing to concrete work
Water proofing
Filling of cracks
To hide open joints of brick work and stone work
To form joints of pipes 22
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CEMENT CONCRETE23
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CEMENT CONCRETE
Mixture of binding materials, fine aggregate and
coarse aggregate and water
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PROCESS OF MAKING CONCRETE
1. Batching
2. Mixing of concrete Hand mixing
Machine mixing
3. Transporting of concrete.
4. Placing of concrete.
5. Compacting of concrete.
6. Curing of concrete.
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GRADES OF CONCRETE
As per Indian standard IS 456-2000
Ordinary concrete - M10,M15,M20
Standard concrete -
M10,M15,M20,M25,M30,M35,M40,M45,M50,M55
High strength cement - M60,M65,M70,M75,M80
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M5 1:5:10 Mass concrete works for strong walls and
foundations
M10 1:3:6 Flooring
M15 1:2:4 Plain cement concrete
M20 1:1.5:3 RCC
M25 1:1:2 Water retaining structures, precast products
M30 onwards Desig
n mix
Heavily loaded RC columns and arches,
prestressed concrete
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PROPERTIES OF CONCRETE
Fresh concrete/green concreteWorkability
Segregation
Bleeding
Consistency
Hardened concrete Strength
Shrinkage
Creep
Thermal expansion
Durability
Imperviousness28
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APPLICATIONS OF CONCRETE
Dams, Bridges , RCC buildings, swimming pools,
homes, streets, basements, balustrades, plain cement
tiles, mosaic tiles, pavement blocks, lamp-posts, drain
covers, benches.
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REINFORCED CEMENT CONCRETE
RCC is a concrete combined with steel in such a
way that the compressive strength of concrete
and tensile strength of steel are used to the best
advantage.
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ADVANTAGES OF RCC
Reinforced Cement Concrete has good compressive stress (because of concrete).
RCC also has high tensile stress (because of steel).
It has good resistance to damage by fire and weathering (because of concrete).
RCC protects steel bars from buckling and twisting at the high temperature.
RCC prevents steel from rusting.
Reinforced Concrete is durable.
The monolithic character of reinforced concrete gives it more rigidity.
Maintenance cost of RCC is practically nil. 31
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DISADVANTAGES OF RCC
The tensile strength of reinforced concrete is about one-
tenth of its compressive strength.
The main steps of using reinforced concrete are mixing,
casting, and curing. All of this affect the final strength.
The cost of the forms used for casting RC is relatively
higher.
For multi-storied building the RCC column section is
larger than steel section as the compressive strength is
lower in the case of RCC.
Shrinkage causes crack development and strength loss
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USES OF RCC
Beams, Floor slabs, Columns, Walls,
Foundations, Arches, Staircases,
Water tanks, Pipes, chimneys, Retaining,
Bridge girders, Culvurts.
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STEEL34
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STEEL
Uses of steel
As structural material in trusses , beams etc
As non structural material for grills, doors, windows etc
In steel pipes,tanks etc
In sanitary and sewer fittings,rain water goods, etc
Corrugated sheets
As reinforcement in concrete
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CLASSIFICATION OF STEEL
Mild steel
Medium carbon steel
High carbon steel or hard steel
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STEEL AS REINFORCEMENT IN CONCRETE
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Different market forms of steel
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Steel trusses
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•Steel trusses
•Structural member of steel
framed structures
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Steel trusses
Fabrication of water tank
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Beam, lintel, columns
Steel frames
Grillage foundations
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Grill works,
plate girder
bridges
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Grill works, windows
and gates
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Steel grill works
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Plate girder
bridges
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