the main aim of this project is more strength with minimum cost

1. EFFECT OF RECRON FIBRES ON FLEXURAL BEHAVIOR
ON CONCRETE

2.  G.SUBASH-13BCL0306
 M.PRASANTH-13BCL0302
 K.PALPANDI-12BCL0265
GUIDED BY:
Prof.Dr.SOUNTHARAJAN V.M
GROUP MEMBERS:

3.  To minimize the construction cost .
 Reduce the quantity of cement for using agriculture waste,
etc.
 Improve the compressive, flexural & tensile strength of
concrete.
 Cracking, shrinkage and failure modes of concrete should be
reduced.
OBJECTIVES:

4. This research is aimed at putting into effective use Rice Hush
Ash,Marble powder,Fly ash,GGBS(Ground Granulated Blast-
Furnace slag), local additive which has been investigated to be
super pozzolanic in a good proportion to reduce the high cost of
structural concrete. Rice Husk Ash (RHA) is an agricultural
waste product, and how to dispose of it is a problem to waste
mangers. While Concrete today has assumed the position of the
most widely used building material globally. The most
expensive concrete material is the binder (cement) and if such
all-important expensive material is partially replaced with more
natural, local and affordable material like RHA ,Fly
Ash,GGBS,Marble powder will not only take care of waste
management but will also reduce the problem of high cost of
concrete and housing.
INTRODUCTION:

5. In this method we are introducing recron fibres to concrete to
check the behaviour changes in concrete and also try to getting
high strength like( compressive,flexural,split tensile strength).
Because due to the following reasons,
1.fibre reduces the water permeability.
2.increase the flexural strength due to have higher modulus of
elasticity compared to that concrete or mortar binder.
3.its post cracking behaviour helps to continue to absorb energy
as fiber pull out.

6. 4.increases energy absorption capability of concrete.
5.Improves homogeneity of the concrete by reducing
segregation of aggregates.

7.  M40 Design as per IS code 10262-2009
 Mix proportion 1:1.65:2.42:0.4
DESIGN:

8.  Cement opc-53 grade
 Coarse aggregate-(20mm size)
 Fine aggregate
 Recron Fiber-(0.5%,1%,1.5%,2%)
MATERIALS USED & EXPERIMENTAL
METHOD:

9.  Tenacity (adequate strength)
 Flexibility or pliability
 Uniformity.
 Fiber morphology
 Specific gravity
 Elongation and elastic recovery
 Resiliency
 Moisture regain`
 Electrical conductivity
 Abrasion resistance
 Chemical reactivity and resistance
 Sensitivity to environmental conditions.
PROPERTIES OF RECRON:

10.  The compressive strength is the capacity of a material or
structure to withstand loads tending to reduce size.
 It can be measured by plotting applied force against
deformation in a testing machine
 Compressive strength is a key value for design of structures.
COMPRESSIVE STRENGTH:

11. σ=P/A
P=Axial load (KN)
A=Area of specimen (m²).
σ=compressive stress(KN/m²).
Calculation for compressive strength:

12.  Flexural strength, also known as modulus of rupture, bend
strength, or fracture strength, a mechanical parameter for
brittle material,
 It is defined as a material's ability to resist deformation under
load.
 The transverse bending test is most frequently employed, in
which a specimen having either a circular or rectangular cross-
section is bent until fracture or yielding using a three point
flexural test technique.
 The flexural strength represents the highest stress experienced
within the material at its moment of rupture.
FLEXURAL STRENGTH:

13. Flexural testing machine:

14. FB= PxL/(bxd²)
Where,
P=axial load (kN)
L=length of specimen (m)
b=breadth of specimen (m)
d=depth of specimen (m)
Calculation for flexural test:

15.  Split tensile strength-Placing cylinder horizontally between
the load.
 surfaces of a compression testing machine
Load is applied until specimen fails along the
vertical diameter
SPLIT TENSILE STRENGTH:

16. Compressive loading machine:

18. Cube=100mmx100mmx100mm
Rectangular=500mmx100mmx100mm
Cylindrical=100mmx200mm
Based on this the amount of concrete
required for the cube or rectangular are
calculated.

23. The tested specimen has different strength at 7&28 days are
calculated using of the apparatus.
The results are tabulated .
The strength of recron fiber reinforced concrete is greater than
the reinforced concrete observed from the results.
GRAPH:
X-axis=% of recron fiber
Y-axis=compressive, flexural, tensile (N/mm^2)
RESULTS &GRAPH:

24. Compressive strength:
Type of
concrete
load
applied(KN)
7 days
curing
load
applied(KN)
28
days
curing
concrete 0.218 21.8 0.3575 35.75
0.5% recron 0.2234 22.34 0.3575 35.75
1% recron 0.231 23.10 0.3706 37.06
1.5% recron 0.2572 25.72 0.3880 38.80
2% recron 0.2616 26.16 0.3924 39.24
Compressive strength(N/mm^2)

26. Flexural strength:
Type
of
concrete 7 days
curing
load
applied(
KN)
28 days
curing
load
applied(
KN)
concrete 3.48 0.174 4.5 0.225
0.5%
recron
3.78 0.189 4.86 0.243
1%
recron
4.45 0.222 5.22 0.261
1.5%
recron
4.62 0.231 5.4 0.27
2%
recron
5.46 0.273 6.07 0.3035
Flexural strength (N/mm^2)

28. Split tensile strength:
Type of
concrete 7 days
curing
load
applied(KN)
28 days
curing
load
applied(KN)
concrete 2.64 0.3317 4.16 0.5227
0.5% recron 2.78 0.3493 4.44 0.5579
1% recron 3.05 0.3832 4.72 0.5931
1.5% recron 3.47 0.4360 4.85 0.6094
2% recron 3.75 0.4712 5.13 0.6446
Split tensile strength(N/mm^2)

30. Target Mean strength for mix design:
The target means compressive ( ck) strength at 28 days is givenḟ
by
ck =fck+tSḟ
where as,
S=standard deviation=5(As per IS code456 of 2000)
t=1.65 a statical value depending on expected proportion of low
results (risk factor)
as per IS code 456-2000 & IS code 1343-80.
fck=characteristics of compressive strength at 28 days.
1. ck=35.75+(1.65x5)=44( N/mm^2).ḟ
2. ck=37.06+(1.65x5)=45.31( N/mm^2).ḟ
3. ck=38.8+(1.65x5)=47.05( N/mm^2).ḟ
4. ck=39.24+(1.65x5)=47.49( N/mm^2).ḟ

31. An experimental study was conducted on cubes, cylinders, beam, for
compressive, split tensile strength, flexural test respectively by mixing
various percentages of recron fiber. Based on the investigation the following
conclusions were drawn. They are
The Compressive Strength of Reinforced Concrete was less than Recron
Fiber Reinforced Concrete at all percentage of mix.
The Split Tensile Strength of Reinforced Concrete was less than Recron
Fiber Reinforced Concrete at all percentage of mix.
The flexural strength of reinforced concrete was less than recron fiber
reinforced concrete at all percentage of mix.
Hence, Recron Fiber has greater strength in Compression, Split Tension and
Flexure.
CONCLUSION:

32. Shah RH, Mishra SV. Crack and deformation characteristics of
SFRC dep beams.
Institution of Engineers (India) Journal of Civil Engineering,
85(2004) 44-8.
Sachan AK, Kameswara Rao CVS. Behaviour of fibre
reinforced concrete deep beams.
Cement & Concrete Composites, 12(1990) 211-8.
REFERENCES:

33. Shanmugam NE, Swaddiwuuhipong S. The ultimate load
behaviour of fibre reinforced concrete deep beams. Indian
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reinforced concrete deep
beams containing openings. International Journal of Cement
Composites and Lightweight Concrete, No. 1, 10(1988) 53-
60.

34. Ahmed Loukili and Laurent Daniel May-June 2002. Behavior
of High Strength Fibre- Reinforced Concrete Beams Under
Cyclic Loading. “ACI Structural Journal”, (2.2) Page No: 248 to
256
Balaguru,N.P. and Shah,S.P. (1992),Fiber Reinforced Cement
Composities, McGraw Hill Inc.,
Colin D. Johnston, (2001) “Fiber reinforced cements and
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Indian Standard methods of tests for splitting tensile strength of
concrete, IS 5816:1999, Bureau of Indian Standards, New Delhi.

35. P.Baruah & S.Talukdar, (2007)”A Comparative study of
compressive, flexural, and shear strength of concrete with fibres
of different origins”, The Indian Concrete Journal, Vol.75,No.
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Arnon Bentur & Sidney Mindess, (1990) „„ Fibre reinforced
Cementitious composites Elsevie applied science London and‟‟
Newyork
Rathish Kumar P. et al Vibration characteristics of fibre
reinforced self Compacting mortar (FRSCM) (2.7).
 Nataraja,M.C.,Dhang,N.,and Gupta,A.P. (2001),”Splitting
tensile Strength of SFRC”,The Indian Concrete Journal,
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36. Indian Standard methods of tests for compressive strength and
flexural strength of concrete ,IS 516:1959, Bureau of Indian
Standards, New Delhi.
Anthony J. et al, May-June 2001. Flexural Strengthening of
R.C Beams Using Fasteners and Fibre Polymer Strips “ACI
Structural Journal” Page No: 368 to 376

37. THANK YOU