It is type of Fiber reinforced concrete

1. Synthetic fiber
reinforced
concrete
Underguidanceof c s deshapande
Prajwal pattar
Maratha mandal polytechnic belagavi

2. Introduction
• Concrete is strong in compression and weak in
tension
• Even though reinforcement is provided in tension
zone microcracks are developed in the tension and
compression zone.
• The Propagation of these cracks can be arrested by
using synthetic fibre reinforcement in concrete.
• Because of this we can not only arrest crack
formation but also we can increase flexural, shear,
torsion, strength, freezing and thawing resistance.

3. Synthetic fiber reinforcedconcrete
• Synthetic fiber-reinforced concrete uses plastic,
nylon and polyproplene fibers to improve the
concrete’s strength
• The synthetic fibers do not expand in heat or
contract in the cold which helps prevent cracking.
• Synthetic fibers help keep the concrete from
spalling during impacts or fires.

4. 1300/kg 376/kg 136/kg 170/kg
Source:www.indiamart.com
Acrylic Rayon Polystar Polypropylene
Petroleum or
coal- based
chemical
wood pulp petroleum crude oil

5. Types of synthetic fiber
Micro fibers have a
diameter that is
less then 0.3mm
Macro fibers
have a diameter
greater then
0.3mm
Micro
synthetic fiber
Macro
synthetic fiber

6. Orientation of fibers
1. Aligned in the direction of load
2. Aligned in the direction perpendicular to
load
3. Randomly distribution of fibers

7. Typical Proportions for synthetic fiber reinforced
concrete
Ingredients Proportions
Cement
content
325 to 550
kg / m3
w/c Ratio
Sand/total
aggregate
Air content
0.4 to 0.6
50-100%
6-9%
Fiber content :
fibers Percentage
Synthetic
fibers
1% for
11kg /m3
M25
Source:WWW.nevadareadymix.com

8. Volume of fiber
• low volume fraction (less then 1%): Used in slabs and pavement
that have large exposed surface leading to shrinkage cracking
• Moderate volume fraction (between 1 and 2%):Used in
construction method such as shotcrete
• High volume fraction (greater then 2%):Used in making high
performance FRC
Source :WWW.nevadareadymix.com

9. • Aspect Ratio is the ratio of length of the Fibre to the diameter of its
cross section.
• Aspect Ratio = Length (L) / Diameter(D)
• Increase in the aspect ratio upto 75, there is increase inrelative
strength and toughness.
Aspect
Ratio
Aspect Ratio Reletive strength Reletive toughness
0 1.00 1.00
25 1.50 2.00
50 1.60 8.00
75 1.70 10.50
Type of Concrete
Plain concrete
with
randomly.
Dispersed fibers

10. Fiber Reinforced Concrete Normal Reinforced concrete
• High Durability • Lower Durability
• Lighter materials • Heavier material
• More expensive • Economical
• With the same volume, the strength is
greater
• With the same volume, the strength is less
• Less workability • High workability as comparedto SFRC.
DIFFERENCE BETWEEN SFRC AND NRC

11. MECHANICAL PROPERTIES OF SFRC
• Addition of 4% of fibres report 2.5 times
more increase in flexural strength.
• Compressive strength- Improves(0-15 %).
• Toughness is about 20-40 times that of
plain concrete.
• Impact strength is 5 to 10 times of plain
concrete and improves wear and tear.
Source: researchgate.net

12. ADVANTAGES SYNTHETIC FIBER REINFORCED
CONCRETE
1. Main role of fibres is to bridge the cracks that develop in concrete
and increase the ductility of concrete elements.
2. Improvement on Post-Cracking behaviour of concrete
3. Imparts more resistance to Impact load
4. Lowers the permeability of concrete matrix and thus reduce the
bleeding of water
5. Does not rust nor corrode and requires no minimum cover.
6. High modulus of elasticity for effective long-term reinforcement,
even in the hardened concrete.

13. APPLICATION
 Pipes
 Slabs
 Tilt-up panels
 Counters tops
 Shotcrete
 Tiles
 Bridge slabs

14. Micro synthetic fiber reinforced Pevment Polymer Micro synthetic
Highway pavement

15. Free cast block using polypropylene fiber Macro fibers
Free cast concrete blocks

16. • The efficient Utilization of fibrous concrete involves improved
static and dynamic properties like tensile strength, energy
absorbing characteristics, Impact strength and fatigue strength.
• At elevated temperature, SFRC have more strength both in
compression and tension.
CONCLUSION:
• The total energy absorbed in fiber as measured by the area
under the load-deflection curve is at least 10 to 40 times higher
for fiber reinforced concrete than that of plain concrete.

17. Reference
• INTERNATIONAL JOURNAL OF ENGINEERING RESEARCH &
TECHNOLOGY (IJERT)
• WWW.nevadareadymix.com
• Cost of all fibers : india mart
• Case study :https://www. Concrete.pdf
• ScienceDirect Support Center
• International Journal of Scientific Research & Engineering
Trends Volume 7, Issue 5, Sept-Oct-2021, ISSN (Online): 2395-
566X

18. Thank you