EXPERIMENTAL INVESTIGATION ON HYBRID FIBER
REINFORCED CONCRETE
FIRST REVIEW
PROJECT MEMBERS
UNDER THE GUIDENCE OF
Mrs. S .VALLABHY, M.Tech
(Assistant professor)
SP.Palaniappan
P.Thiayagarajan
C.V.Sharath
D.Vinod panwar
111412103062
111412103101
111412103104
111412103111
INTRODUCTION
• Concrete with a single type of fiber may improve the
desired properties to a limited level.
• A composite is termed as hybrid, if two or more types
of fibers are rationally combined to produce a
composite that derives benefits from each of the
individual fibers exhibits a synergetic response.
NEED FOR THE STUDY
• There is considerable improvement in the post-
cracking behavior of concretes containing fibers.
• Although in the hybrid fiber-reinforced concrete
the ultimate tensile strengths do not increase
appreciably, the tensile strains at rupture do.
• Compared to plain concrete, hybrid fiber
reinforced concrete is much tougher and more
resistant to impact.
LITERATURE REVIEWHybrid fiber reinforced concrete fiber synergy in high strength matrices, Banthia and
Gupta (2004) Journal Materials and structures.
1. Hybrids based on the fibre constitutive response, in which one fibre is stronger and stiffer and
provides strength, while the other is more ductile and provides toughness at high strains.
2. Hybrids based on fibre dimensions, where one fibre is very small and provides micro crack
control at early stages of loading; the other fibre is larger, to provide a bridging mechanism across
macro cracks.
3.Hybrids Based on Fiber Function: One type of fiber is intended to improve the fresh and early
age properties such as ease of production and plastic shrinkage, while the second fiber leads to
improved mechanical properties. Some such hybrids are now commercially available where a low
(0.2%) dosage of polypropylene fiber is combined with a higher (-0.5%) dosage of steel fiber.
Experimental Investigation on Flexural Performance of Hybrid Fibre
Reinforced Concrete , S. Eswari (2015), International Research Journal of
Engineering and Technology
Eswari.S has investigated about the flexural performance of hybrid fibre
reinforced concrete.
The influence of fibre content on the strength and ductility performance of
hybrid fibre reinforced concrete specimens having different proportions of
steel (S) and polyester (P) fibres was investigated.
The prisms of 100 x 100 x 500 mm dimensions were tested to study the
above parameters. The specimens incorporated 1.0% fibre volume fraction
of steel and polyester fibres in different proportions.
The strength and ductility performance of hybrid fibre reinforced concrete
specimens was compared with that of plain concrete. The test results show
that a proportion of S60P40 hybrid fibres improve the performances
appreciably.
Experimental investigation on strength and durability properties of hybrid fiber
reinforced concrete , Brijbhushan.S and Maneeth.P.D (2015), International
Research Journal of Engineering and Technology
In this experimental work using of two different fibres they are crimped
steel fibre and polypropylene fibre with different mix proportion of hybrid
fibres to form the hybrid fibre reinforced concrete.
Initial cracks, shrinkage cracks can be resist by using of polypropylene
fiber and steel fiber is to increases the strength parameters.
The proportion of steel and polypropylene fibres are added by 50% each
with different hybridization ration i.e. 0%,0.5%, 1.0 %, 1.5% .
From the work results showed that as the percentage of fibres increases, the
strength of concrete increases. Hybrid ratio 1.5 % gives maximum results
in all the strength parameters compare to other different hybrid ratios.
Influence of Hybrid Fiber on Reinforced Concrete, Jaison Varghese, P.
Muthu Priya , et..al (2014), International Journal of Advanced
Structures and Geotechnical Engineering
In this paper volume fraction of fiber is adopted as 0.5%. Controland three hybrid fiber composites were cast using different fiberproportions of steel and polypropylene.
The maximum compressive strength reaches in the HFRCS0.75P0.25, i.e., 75% steel fibres and 25% polypropylene fibres.
The spilt tensile strength, flexural strength of fibre percentage withS0.75P0.25 shows slight increase in strength. Improved tensilestrength can be achieved by increasing the percentage of steel fibres.
It can be observed that, under axial loads, cracks occur inmicrostructure of concrete and fibres limit the formation and growthof cracks.
Development Of Hybrid Polypropylene-steel Fibre Reinforced Concrete,
C.X. Quian, P. Stroeven (2000), Cement and Concrete Research
In this paper Qian and Stroeven measured the compressive strength, split
tensile strength of different mixes incorporating various volume fractions of
steel and polypropylene fibers.
A common concrete matrix was used in all mixes, with a water cement
ratio of 0.40 and cement content of 400 kg/m3.
Results of this study indicate that due to their crack bridging capacity, even
low modulus fibers may increase the strength of the matrix.
However an excess of fibers leads to additional defects during the
production stage, because optimum packing stage of particles and fibers
can not be achieved. Thus strength may be reduced.
METHODOLOGY
MIX DESIGN
PRELIMINARY TESTING
LITERATURE REVIEW
NEED FOR STUDY
INTRODUCTION
CONCLUSION
COMPARATIVE STUDY WITH CONTROL MIX
TESTING OF SPECIMENS
CURING
CASTING
SPECIFIC GRAVITY OF FINE AGGREGATE
S.NO Description (g) Trial 1 Trail 2 Trail 3 Mean
1Weight of
pycnometer(W1)
680 680 680
2.64
2Weight of pycnometer
+ sand(W2)
875 879 886
3Weight of pycnometer
+ sand + water(W3)
1678 1681 1685
4Weight of pycnometer
+ water(W4)
1557 1557 1557
5 Specific gravity2.635 2.647 2.64
SPECIFIC GRAVITY OF COARSE AGGREGATE
S.NO Description (g) Trial 1 Trail 2 Trail 3 Mean
1Weight of
pycnometer(W1)
713 713 713
2.72
2Weight of pycnometer
+ gravel(W2)
1086 1090 1097
3Weight of pycnometer
+ gravel + water(W3)
1771 1776 1782
4Weight of pycnometer
+ water(W4)
1537 1537 1537
5 Specific gravity2.68 2.73 2.76
Sieve Size Mass retained
(g)
Cumulative
mass retained
(g)
Cumulative %
of mass
retained
Cumulative %
of mass
passing
through
4.75 mm 0 0 0 100
2.36 mm 110 110 11 89
1.18 mm 200 310 31 69
600 microns 240 550 55 45
300 microns 250 800 80 20
150 microns 190 990 99 1
<150 microns 10 1000 100 0
FINENESS MODULUS OF FINE AGGREGATE
FINENESS MODULUS = 2.76
GRADING OF FINE AGGREGATE AS PER
I.S.383.1970
IS Sieve
Designation
Percentage passing for
ZONE I ZONE II ZONE III ZONE IV
10 mm 100 100 100 100
4.75 mm 90 – 100 90 – 100 90 – 100 95 – 100
2.36 mm 60 – 95 75 – 100 85 – 100 95 – 100
1.18 mm 30 – 70 55 – 90 75 – 100 90 – 100
600 microns 15 – 34 35 – 59 60 – 79 80 – 100
300 microns 5 – 20 8 – 30 12 – 40 15 – 50
150 microns 0 – 10 0 – 10 0 – 10 0 – 15
Fine aggregate is conformed to grading Zone II of Table 4 of I.S.383.1970
Water Absorption of Coarse Aggregate
Sl.no Description Trial
1 Weight of saturated surface dry sample (g) 1000
2 Weight of oven dry sample (g) 991
3 Water absorption 0.9%
W1 – W2
W1
Water absorption = X 100
= (1000-991/1000) x100
= 0.9 %
Water Absorption of Fine Aggregate
Sl.no Description Trial
1 Weight of saturated surface dry sample (g) 500
2 Weight of oven dry sample (g) 495
3 Water absorption 1%
W1 – W2
W1
Water absorption = X 100
= (500-495/500) x100
= 1 %
AGGREGATE IMPACT TEST
Sl.NoWeight of
sample (A) kg
Aggregate
Passed
Through
2.36mm Sieve
(B) kg
Weight
Retained in
Sieve (C) kg
Aggregate
Impact
Value(%)
Mean
(%)
1 0.44 0.053 0.387 8.3
8.782 0.473 0.056 0.417 8.44
3 0.49 0.051 0.439 9.61
PROPERTIES OF FIBERS
STEEL FIBER
SPECIFICATIONS VALUES
Length 30 mm
Diameter 0.6 mm
Aspect Ratio 50
Sp. Gravity 7.19
Type Hooked
POLYPROPYLENE FIBER
SPECIFICATIONS VALUES
Length 12 mm
Diameter 0.1 mm
Aspect Ratio 120
Sp. Gravity 0.9
Type Mono filament
PHOTOS
Week 1 2 3 4 5 6 7
Curing (10/02/2016 to 09/03/2016)
Literature collection (1/02/2016 to 04/02/2016)
Preliminary tests (04/02/2016 to 07/02/2016)
Mix design (07/02/2016 to 09/02/2016)
Casting (09/02/2016 and 10/02/2016)
Testing (09/03/2016)
Report preparation (10/02/2016 to10/03/2016)
WORK SCHEDULEWork completed
Work in Progress
Work yet to be started
THANK YOU