View
227
Download
0
Category
Preview:
Citation preview
8/13/2019 Fiber Reinforced Concrete(1)
1/20
F I B R E R E I N F O RC E D
C O N C R E T E
Presented by
Bellum Ramamohana Reddy
097Q1A0107
8/13/2019 Fiber Reinforced Concrete(1)
2/20
CONTENTS:
NeedsFactors Affecting The Properties Of FrcTypes of Frcs Steel fibre Reinforced Concrete (SFRC)
Types of steel fibersIntroduction of steel fibres modifiesApplications of SFRCPolypropylene Fibre Reinforced Concrete (PFRC)Glass Fibre Reinforced Concrete (GFRC)Carbon fibresConclusion 2
F I B RE RE
I NF OR
C E D
C ON
C RE T
E
8/13/2019 Fiber Reinforced Concrete(1)
3/20
NEED
PCC has low tensile strength, limited ductility andlittle resistance to cracking
PCC develops micro-cracks, even before loading
Addition of small, closely spaced and uniformlydistributed fibres act as crack arresters.
FIBRE REINFORCED CONCRETE is acomposite material consisting of mixtures ofcement, mortar or concrete and discontinuous,discrete, uniformly dispersed suitable fibres. 3
F I B RE RE
I NF OR
C E D
C ON
C RE T
E
8/13/2019 Fiber Reinforced Concrete(1)
4/20
FACTORS A FFECTING T HE PROPERTIES O F FRC
Relative Fibre Matrix Stiffness
Volume of Fibres
Orientation of FibresWorkability and Compaction of Concrete
Size of Coarse Aggregate
Mixing
F I B RE RE
I NF OR
C E D
C ON
C RE T E
4
8/13/2019 Fiber Reinforced Concrete(1)
5/20
1. R ELATIVE F IBRE MATRIX S TIFFNESS
Modulus of elasticity of matrix must be muchlower than that of fibre. E.g. steel, glass,
carbon
Fibres with low modulus of elasticity- nylon,
polypropylene
Interfacial bond between the matrix and the
fibres determine the effectiveness of stress
transfer5
F I B RE RE
I NF OR
C E D
C ON
C RE T E
8/13/2019 Fiber Reinforced Concrete(1)
6/20
8/13/2019 Fiber Reinforced Concrete(1)
7/20
3. O RIENTATION OF F IBRES
The effect of randomness, was tested usingmortar specimens reinforced with 0.5% volume
of fibres, by orienting them:
parallel to the direction of the load
perpendicular to the direction of the load
in random
7
F I B RE RE
I NF OR
C E D
C ON
C RE T E
8/13/2019 Fiber Reinforced Concrete(1)
8/20
4. Workability and Compaction of
ConcreteFibres reduce workability
5. Size of AggregateSize of CA is restricted to 10mm
8
F I B RE RE
I NF OR
C E D
C ON
C RE T E
8/13/2019 Fiber Reinforced Concrete(1)
9/20
6. M IXING Cement content : 325 to 550 kg/m 3
W/C Ratio : 0.4 to 0.6
% of sand to total aggregate : 50 to 100%
Maximum Aggregate Size : 10 mm
Air-content : 6 to 9%
Fibre content : 0.5 to 2.5% by vol of mix
: Steel -1% - 78kg/m 3
: Glass -1% - 25 kg/m 3
: Nylon -1% - 11 kg/m 39
F I B RE RE
I NF OR
C E D
C ON
C RE T E
8/13/2019 Fiber Reinforced Concrete(1)
10/20
T YPES O F F RC S
10
F I B RE RE
I NF OR
C E D
C ON
C RE T E
8/13/2019 Fiber Reinforced Concrete(1)
11/20
STEEL F IBRE REINFORCED CONCRETE (SFRC)
o Diameters vary from 0.25 mm to 0.75 mm
o Hooks are provided at the ends to improve
bond with the matrix
11
F I B RE RE I NF
OR
C E D
C ON
C RE T E
8/13/2019 Fiber Reinforced Concrete(1)
12/20
12
F I B RE RE I NF
OR
C E D
C ON
C RE T E
8/13/2019 Fiber Reinforced Concrete(1)
13/20
I NTRODUCTION OF STEEL FIBRES MODIFIES :1. Tensile strength2. Compressive strength3. Flexural strength
4. Shear strength5. Modulus of Elasticity6. Shrinkage7. Impact resistance8. Strain capacity/Toughness9. Durability10. Fatigue
13
F I B RE RE I NF
OR
C E D
C ON
C RE T E
8/13/2019 Fiber Reinforced Concrete(1)
14/20
APPLICATIONS OF SFRC
Highway and airport pavements
Canal linings
Industrial floorings and bridge-decksPrecast applications - wall and roof panels, pipes,
boats, staircase steps & manhole covers
Structural applications
14
F I B RE RE I NF
OR
C E D
C ON
C RE T E
8/13/2019 Fiber Reinforced Concrete(1)
15/20
POLYPROPYLENE F IBRE REINFORCED CONCRETE (PFRC)
Cheap, abundantly available
High chemical resistance
High melting pointLow modulus of elasticity
Applications in cladding panels and shotcrete
15
F I B RE RE I NF
OR
C E D
C ON
C RE T E
8/13/2019 Fiber Reinforced Concrete(1)
16/20
GLASS F IBRE REINFORCED CONCRETE (GFRC)
High tensile strength, 1020 to 4080 N/mm 2
Lengths of 25mm are used
Improvement in impact strengths, to the tuneof 1500%
Increased flexural strength, ductility and
resistance to thermal shocko Used in formwork, swimming pools, ducts and
roofs, sewer lining etc. 16
F I B RE RE I NF
OR
C E D
C ON
C RE T E
8/13/2019 Fiber Reinforced Concrete(1)
17/20
CARBON F IBRES
Material of the future, expensiveHigh tensile strengths of 2110 to 2815 N/mm 2
Strength and stiffness superior to that of steel
17
F I B RE RE I NF
OR
C E D
C ON
C RE T E
8/13/2019 Fiber Reinforced Concrete(1)
18/20
CONCLUSION
Fiber reinforced concrete structures are having hightensile strength.Less cracks
Load bearing capacity
18
F I B RE RE I NF
OR
C E D
C ON
C RE T E
8/13/2019 Fiber Reinforced Concrete(1)
19/20
8/13/2019 Fiber Reinforced Concrete(1)
20/20
Recommended