Fibre has been in existence as far back as era ancient time, in the past the horsehair and straw were using in mudbrick. In early 1900s the use of asbestos fibre in concrete material was introduced but it has limitation due to its hazard on human health. In 1950s concept of composite material was adopted in concrete work in which fibre is one of the them but it has not been widely used nowadays as a reinforced material in concrete. In early 1960s in the United States, investigation was firstly made to assess the potential of steel fibres as a reinforcement for concrete. Ever since then, a series of researches have been performed on fibres which steel and glass are major considerations

1. STEELFIBREREINFORCED
CONCRETE
PRESENTED BY
SAMSON ADESOPE
&
YARED ASSEFA

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INTRODUCTION
FIBRE REINFORCED TECHNOLOGY
Work Commissioning
Safety
Common Defects
PRESENTATION OUTLINE

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‘‘
‘‘Innovation is taking two things that already
exists and putting them together in a new way
Tom Freston.

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QUESTIONS
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Why do need fiber Technology
• Have you ever heard about fibre? If yes, how can we use it to solve construction problem.
• What makes fibre reinforced concrete to be unique.
• What are the benefits of using fibre in concrete

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WHAT IS FIBRE
REINFORCEMENT
CONCRETE
Fibre reinforced concrete (FRC) is a
concrete made primarily of hydraulic
cements, aggregates and discrete
reinforcing fibres. FRC is a relatively new
material. This is a composite material
consisting of a matrix containing a
random distribution or dispersion of small
fibres, either natural or artificial, having a
high tensile strength.

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Common types of fibre for concrete work
Steel Reinforced
Fibre
Glass Reinforced
fibre
Natural Fibre
Synthetic Fibre

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Strength
Toughness
Impact
resistance
Durability
7PROPERTIES OF FRC

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STEEL FIBER REINFORCED CONCRETE
STEEL FIBER REINFORCED CONCRETE: Steel
Fibre Reinforced Concrete (SFRC) can be
defined as a concrete, containing
discontinuous discrete steel fibres, which
when incorporated in concrete improve its
crack resistance, ductility, energy absorption
and impact resistance characteristics and
offer a long term post crack tensile strength.
Structural Uses of Steel Fibre
Reinforced Concrete
Steel fibre reinforced concrete has
many roles to play in construction
work as it capable of reducing
cracking and thickness in highway,
airport runway, Staircase other
application are listed below;
 Industrial flooring
 Foundation slabs for residential
buildings
 Explosion-resistant structures —
Usually in combination with
reinforcing bars
 Refractory concrete
 Precast works
 Dam construction and repair
 Bridge deck construction repair
 Structural building elements

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IMPORTANT PARAMETERS OF STEEL FIBRE
 Shape (straight, hooked, undulated, crimped, Twisted, coned)
 Length (12.7 to 63.5 mm)
 Diameter (0.4 to 1.0 5mm)
 Tensile Strength (1000 – 2500 N/mm²)
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COMMON TYPES OF STEEL FIBRE REINFORCED Factors affecting Fibre
reinforced Concrete
Volume of fibre
Shape of fibre
Aspect ratio of fibre
Fibres Orientation
Concrete
workability and
compaction
Mixing

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ADVANTAGES OF USING FIBER REINFORCED CONCRETE VERSUS PLAIN
CONCRETE
Flexural strength
is improved by
up to 30% by
decreasing the
propagation of
cracks
Improves tensile
strength
Improves
toughness of
concrete
More
economical
than steel
reinforcement
Reduce crack
widths and
control the crack
widths tightly,
thus improving
durability

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SFRCConstruction
ReiReinforced Concrete with the addition
of fibre

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WORK COMMISSIONING CRITERIA
 According to materials
 According proportioning
(dosage)
 Batching mixing and
sampling
 Transporting and placing
 Finishing work
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According to material
 Care should be taken to see that steel fibers are stored in a manner
that will prevent their deterioration or the intrusion of moisture or
foreign matter. If fibers deteriorate or become contaminated, they
should not be used
 it is necessary to specify the fiber’s length,
diameter, and other features such as end
anchorage provisions, collating deformations and
a minimum ultimate tensile strength

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ACCORDING PROPORTIONING
(DOSAGE)
 As with conventional concrete, SFRC mixtures employ a variety of mixture proportions depending upon the
end use. They must be specially proportioned for a project. In either case, they must be adjusted for yield,
workability.
 SFRC shall be limited to manufacturers published dosages

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BATCHING MIXING AND SAMPLING 16
 The contractor should supply
appropriate equipment or develop a
suitable technique for dispersing the
fibers in the mixer, free of fiber balls. The
equipment and/or method of adding
the fibers to the mix should be
reviewed and accepted by the
engineer before any placement of
SFRC takes place.
 The batching procedure is critical to
obtaining a good blend of fibers with
the concrete
 It is compulsory to test SFRC
consistency using the slump
test

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TRANSPORTING AND PLACING
 Transporting and placing of SFRC should be accomplished with most
conventional equipment that is properly designed, maintained, and clean.
 Transit trucks
 Concrete buckets
 Pumping

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5. FINISHING WORK
Conventional concrete equipment is adequate for the placing and finishing
of nearly all steel fiber reinforced concrete. Internal or external vibrators
(including vibrating screeds) can be used to reduce pockets of entrapped air
voids.
According to Formwork
The fibers in steel fiber reinforced concrete have a
tendency to protrude from sharp corners to formed
concrete. These may be hazardous to personnel. To
minimize this, sharp comers should be chamfered.

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Defects
 Fiber balling
Improper mixing operation cause fiber balling
This means that if balls form, it is because fibers
were added in such a way that they fell on
each other and stacked up (in the mixer, on
the belt, on the vanes, etc.) This normally
happens when the fibers are added too fast
at some point in the procedure. The mixer,
whatever type, must carry the fibers away into
the mixture as fast as they are added.
 Improper Finishing work and equipment
 Overwork surface
 Poor finishing equipment’s may lead for
fibers to stick out of the structure

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20HEALTH AND SAFETY
Working with reinforced concrete
fibres require much carefulness,
priority should be placed on
safety, numerous of hazards can
occur while working at various
stages of concrete work
 Toolbox Talks
Prior to the construction
process toolbox/ orientation
on safety measure and
precaution should be
conducted for everyone to
work in the construction site or
its premises. Work Supervisor
and safety officer should be
assigned to each section of
the construction activities.
 Fall Protection
be provided
to employees dealing
with formwork and
working six feet or
more above a lower
level

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21HEALTH AND SAFETY
 PERSONAL PROTECTIVE
EQUIPMENT.
PPE is one of the important tools when
working with concrete, PPE should be
wear and used always while working
with Fibre reinforced Concrete no
matter how uncomfortable it is, wear it
on the job. Basic proper PPE for heavy
concrete operations usually consists of
safety glasses, gloves, shoes/boots,
hard hat, respiratory protection and
cover all clothing that keeps your skin
from having direct contact with
concrete.

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REFERENCE
 Jagadish K.S., Venkatarama Reddy B.V. and Nanjunda Rao K.S., Alternative Building Materials and
Technologies, First Edition, New Age International Publishers, New Delhi, 2007.
 ACI Committee 544, State-of-The-Art Report on Fiber Reinforced Concrete, ACI 544 1.R-96
 Mamlouk, Michael, and John Zaniewski. Materials for Civil and Construction Engineers. Second Edition.
 N.J.: Pearson Hall, PrintMehta, P.K., and P.J.M Monteiro. "Fibers in Concrete." University of Californa, Berkeley,
04, May,2006. Web. 1 Dec
 Nemati, Kamran. "Progress in Conctet Technology: Fiber Reinforced Conctete (FRC)." University of
Wahington. University of Washington, Seattle, Wahington, USA. Spring Lecture.SMiRT 19, "WOKSHOP ON: Fiber
Reinforced Concrete." ASMiRT, 17, August,2007. Web. 1 De
 https://www.designingbuildings.co.uk/wiki/Rebar
 ‘Building Construction Handbook’ (6th ed.), CHUDLEY, R., GREENO, R., Butterworth-Heinemann (2007)
 https://civilsnapshot.com/types-steel-reinforcement-bars/
 https://www.technologystudent.com/joints/fibre1.html
 https://www.slideshare.net/bhavinshah80/glass-fiber-reinforced-concrete-53784748
 https://www.slideshare.net/Sonaliparashar/gfrc

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Thank You
for
YOUR
Attention